Skocz do pozycji: 1.

Tytuł:

Numerical analysis of friction influence on the transverse welding phenomenon in the forward extrusion process

Autorzy:

Piwnik, J.
Mogielnicki, K.
Kuprianowicz, J.

Powiązania:

https://bibliotekanauki.pl/articles/279515.pdf

Data publikacji:

2014

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

extrusion
welding criteria
FE analysis

Opis:

There is often a need to join billets being extruded in the forward extrusion processes in order to preserve the continuity of manufacturing of products. The primary problem connected with joining while extruding is to ensure the required state of stress, deformation and temperature assuring a good weld quality. The paper contains numerical analyses of the transverse joining processes of billets in the course of forward extruding. The impact of the friction between welded objects on the material flow in vicinity of the joints is analyzed. A numerical method for determination of the weld length at the longitudinal section, by assuming the homogeneity of the strain rate at both sides of the joined elements contact line, is proposed. Three cases of the forward extruding are analyzed. Two friction shear factors equal to m = 0.4 and m = 0.9 at the billets interface are modelled for each case and weld the lengths at the longitudinal sections are presented. In addition, distributions of the flowing material velocities and effective strains in the weld vicinity are added for all tested processes.

Źródło:

Journal of Theoretical and Applied Mechanics; 2014, 52, 2; 547-555
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Load carrying capacity numerical study of I-beam pillar structure with blast protective panel

Autorzy:

Mazurkiewicz, L.
Kolodziejczyk, D.
Damaziak, K.
Malachowski, J.
Klasztorny, M.
Baranowski, P.

Powiązania:

https://bibliotekanauki.pl/articles/202056.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

FE analysis
blast protection
stability study

Opis:

The paper presents numerical analyses aimed at preliminary assessment of the protective panel effectiveness, which task is to protect the elements of building structures against explosion. For the criterion of assessing the effectiveness of the panel the load capacity of the column made of steel I-beam was chosen. Ultimate force was determined by using advanced computational procedure, which consisted of four stages: preload, blast simulation, dynamic response and static analysis of deformed structure. Blast load was simulated using Lagrangian- Eulerian domain coupling. Results indicated that the application of the protective panel significantly reduces the plastic deformation of the structure.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 451-457
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Analysis of a light caterpillar vehicle loaded with blast wave from detonated IED

Autorzy:

Barnat, W.
Niezgoda, T.
Panowicz, R.

Powiązania:

https://bibliotekanauki.pl/articles/247638.pdf

Data publikacji:

2010

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

IED
vehicle shell
FE analysis
ground

Opis:

More and more impudent attacks on the military convoys in Afghanistan proved a huge danger of the improvised explosive devices - IED. Huger and more clever charges are a serious problem for vehicles protection. Additionally, hitherto defence standards and STANAG didn't predict such huge charges. Majority investigations were based on a 3 kg anti-tank mine. The article presents the results of numerical calculations for the elements of the combat vehicle supporting structure loaded with an impact generated by explosion of a huge explosive charge under the bottom of the vehicle with consideration of the wave reflected from the ground. Such an approach allows obtaining a good approximation of numerical simulations to real conditions of terroristic attacks. Additionally, the analysis of IED side influence on the vehicle shell was conducted. The explosive charge — IED — was simulated with the use of concentrated energy of properly selected (on the base of literature investigations) density and initial energy. During analyses of side explosive on the vehicle structure, the obstacle in the form of a building increasing the pressure impulse was taken into account. The paper presents the results of a numerical analysis in which Euler and Lagrange domains(describing a vehicle) were coupled. A perfect gas model was used to describe air parameters.. Additionally, the ground was described with a gas model. Every kind of material data were selected on the base of experimental investigations. A bilinear material model with a Cowper and Symonds strain rate model was used to describe a vehicle. Such an approach fully describes the phenomena occurring in the system.

Źródło:

Journal of KONES; 2010, 17, 4; 27-34
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

CI engine as a case study of thermomechanical FE analysis of the piston - piston rings - cylinder system

Autorzy:

Szurgott, P.
Niezgoda, T.

Powiązania:

https://bibliotekanauki.pl/articles/247997.pdf

Data publikacji:

2012

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

engine piston
composite piston
thermomechanical analysis
FE analysis

Opis:

The compression-ignition engine as a case study of a methodology of the numerical modelling and simulation of the piston - piston rings - cylinder system was presented in the paper. Thermomechanical FE analysis, taking into account thermal and mechanical loads, was carried out using the MSC.Marc/Mentat software. The mechanical loads included loads due to inertial and gas forces as well. A three dimensional solid geometrical model of the considered set was developed using AutoCAD software, whereas the finite element mesh was generated using Altair HyperMesh. Kinematic boundary conditions - the vertical displacement and acceleration of the piston - were described by the corresponding curves as a function of time for selected engine speed. Changes in pressure on the piston crown were estimated based on data from the engine manufacturer and the corresponded indicator diagram available in the literature. The results of thermomechanical FE analysis were presented in the form of stress and/or displacement contours. The main aim of the analysis was to determine the deformation of the piston depending of on the piston material. Two types of material were compared - the actual one PA12 aluminum alloy and the new composite material with low hysteresis. The second material was characterized by slight differences of the coefficient of thermal expansion for heating and cooling.

Źródło:

Journal of KONES; 2012, 19, 1; 399-406
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Investigation of a panel with an elastomer layer plus carbon fibres loaded with a blast wave

Autorzy:

Barnat, W.
Niezgoda, T.
Gieleta, R.
Panowicz, R.

Powiązania:

https://bibliotekanauki.pl/articles/247636.pdf

Data publikacji:

2010

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

blast wave
experiment
FE analysis
elastomer layer

Opis:

Terrorist attacks are directed against the most important elements of the infrastructure and human life. Crews of the combat vehicles as well as transmission installation of oil, gas and electric energy are, first of all, exposed to such operations. Such a situation caused striving to increase the safety against the activity of short-time loads coming from explosions [l, 2]. The object of the presented investigations was a numerical-experimental analysis of an elastomer layer of the protective panel combined with an experimental verification. Developed elastomer structures constitute perspective materials and will be applied to solve the problems connected with the increase of combat vehicle safety as well as trouble constructions of pipelines and gas pipelines especially in the dangerous places such as passages over rivers. A plate with an elastomer layer (with carbon fibres) loaded with a 100 g TNT charge was subjected to the analysis. The numerical analysis was verified experimentally. The results of the conducted analyses will be applied in further works on the selection of the kinds and parameters of the energy absorbing layers. They will be also used for further validating and optimizing investigations, which will aim at absorbing or dispersion of a maximum great value of energy influencing the energy absorbing panel. Such panels can be used for constructing armoured vehicles and protective elements of stationary strategic constructions. The constructions which can be exposed to damages resulted from a different kind of dynamic forces such as impacts or influences of the pressure wave comingfrom detonation of an explosive material should have the structure enabling absorption of as great as possible part of energy which influences them. Energy absorbing elements are constructed in the form of sandwich structures coats with a specially selected core material. One of the interesting types of materials which can be used for this purpose is elastomer. These materials enable significant increasing of the protective degree due to their capacities of absorbing energy of a blast wave. Applying of these materials results in decreasing of vibrations frequency of a system loaded with a pressure impulse.

Źródło:

Journal of KONES; 2010, 17, 4; 19-26
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Pullout capacity of cylindrical block embedded in sand

Autorzy:

Sternik, K.
Dołżyk-Szypcio, K.

Powiązania:

https://bibliotekanauki.pl/articles/178630.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

block anchors
pullout capacity
FE analysis
plastic limit analysis

Opis:

Calculation of pullout capacity of anchoring concrete cylindrical block by finite element method is carried out. 3D model of the block assumes its free rotation. Alternative solutions with one and two pulling forces attached at different heights of the block are considered. Dependency of the ultimate pulling force on the points of its application, the block’s embedment depth as well as contact friction are investigated. Results of FE analysis and simple engineering estimations are compared. The maximum pullout resistance results from FE analysis when the rotation of the block is prevented.

Źródło:

Studia Geotechnica et Mechanica; 2018, 40, 1; 30-37
0137-6365
2083-831X

Pojawia się w:

Studia Geotechnica et Mechanica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Analysis of a protective composite panel with energy adsorbent in the form of foamed aluminium

Autorzy:

Barnat, W.
Panowicz, R.
Niezgoda, T.
Gieleta, R.

Powiązania:

https://bibliotekanauki.pl/articles/247656.pdf

Data publikacji:

2010

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

blast wave
analytical model
FE analysis
aluminium panel

Opis:

The article presents the results of the investigations into modelling a blast wave for huge charges of l kg TNT equivalent. Modelling of huge charges is a very interesting problem due to a scale effect. During numerical analyses a detonation phenomenon was ignored (for the reason of the analysis time). The paper considers the effects of the influence of a pressure wave coming from a huge TNT charge (modelled with energy) on a 6 mm thick steel plate as well as on a protective panel made of foamed aluminium with composite layer. A panel of foamed aluminium was used for the protection of the described plate. The particular elements of a panel, subjected to an experimental analysis, were jointed with the use of a glueing method. In the numerical model the particular component layers were jointed with contact. The ALE (Arbitrary-Lagrange-Euler) function was used for coupling between the Euler domain and the Lagrange domain. The method requires absolute location compatibility of the nodes from both jointed areas. In the results of the conducted investigations, the permanent deformation of the steel plate was obtained.. Additionally, the possibility of the steel plate deformation evaluation was considered on the basis of accessible literature. Due to a huge charge, the analysis was performed with the use of the finite element method with the eiperimental verification.

Źródło:

Journal of KONES; 2010, 17, 4; 35-44
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

The assessment of the influence of selected passive safety systems on the level of dynamic loads of soldiers during collision

Autorzy:

Hryciów, Z.

Powiązania:

https://bibliotekanauki.pl/articles/247170.pdf

Data publikacji:

2013

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

armoured personnel carrier
impact
passive safety
dummy
FE analysis

Opis:

The work describes chosen problem connected with using of armoured personnel carriers (APC) in the frame of military operations. The soldiers inside the APC are exposed to dynamic loads and shock which are, among other things, an effect of collision with other vehicle or terrain obstacles. In military vehicles, which design is based on a rigid frame or integral body, there is no technical solution to mitigate the effects of a crash. The only applicable means of protection against the effects of collisions are lap belts and helmet designed to protect the head. Preliminary research shows that this kind of equipment is not sufficient. In the work an assessment of the influence of chosen solutions of safety belts and helmets on dynamic loads of carrier’s crew during collision with a rigid obstacle are presented. In simulation researches the HYBRID III dummies models have been used and calculations were carried out in LS-DYNA system. The work shows the numeric test results. Behaviour of the dummies during the impact on both the driver and crew member were presented. To assess a risk of injury standard indicators of crash test were used, including: maximum value of the head acceleration and the maximum values of the forces and moments in the neck. The distributions of these parameters were presented. The assessment of applied passive safety systems was made from the point of view of treat to soldiers inside a carrier.

Źródło:

Journal of KONES; 2013, 20, 3; 161-168
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Analysis of dynamic loads of the armoured personnel carrier crew during frontal crash

Autorzy:

Hryciów, Z.

Powiązania:

https://bibliotekanauki.pl/articles/241831.pdf

Data publikacji:

2012

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

armoured personnel carrier
impact
passive safety
dummy
FE analysis

Opis:

The work describes chosen problem connected with using of armoured personnel carriers (APC) in the frame of stabilisation and peacekeeping mission. The new type of tasks appears: ramming obstacles such as fences, entry gates, light engineering obstacles and also pushing other vehicles aside the road in order to obtain trafficability. The main threat in such situation is a risk of serious injury of soldiers inside vehicle. The lack of a crumple zone increases a value of acceleration acting on the crew. In the work models of driver and crew member seats used in the APC were showed. To the tests a Hybrid III 50th male dummy model in a seated position were used, which is a good representation of the average population of men. To the modelling LS-DYNA software was applied. The work shows the numeric test results. Behaviour of the dummies during the impact on both the driver and crew member were presented. To assess a risk of injury standard indicators of crash test were used, including: maximum value of the head acceleration, the criterion HIC and the maximum values of the forces and moments in the neck. The distributions of these parameters were presented. Results of simulation indicated that velocity and location of dummies has large influence on levels of dynamic loads. To further research is proposed to take into consideration models of dummy with additional equipment of soldiers (e.g. a helmet, a weapon, a bullet-proof jacket).

Źródło:

Journal of KONES; 2012, 19, 4; 223-230
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Field test and numerical studies of the scissors-AVLB type bridge

Autorzy:

Krason, W.
Malachowski, J.

Powiązania:

https://bibliotekanauki.pl/articles/201143.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

scissor-AVLB type bridge
experimental test
numerical FE analysis

Opis:

Scissor bridges are characterized by high mobility and modular structure. A single module-span consists of two spanning parts of the bridge; two main trucks and the support structure. Pin joints are used between modules of the single bridge span. Some aspects of the experimental test and numerical analysis of the scissor-AVLB type bridge operation are presented in this paper. Numerical analyses, presented here, were carried out for the scissors-type BLG bridge with treadways extended as compared to the classical bridge operated up to the present in the Armed Forces of the Republic of Poland. A structural modification of this kind considerably affects any changes in the effort of the force transmitting structure of the bridge. These changes may prove to be disadvantageous to the whole structure because of torsional moments that additionally load the treadways. Giving careful consideration to such operational instances has been highly appreciated because of the possibility of using this kind of bridges while organizing the crossing for vehicles featured with various wheel/track spaces (different from those used previously). The BLG bridge was numerically analysed to assess displacements and distributions of stresses throughout the bridge structure in different loading modes. Because of the complexity of the structure in question and simplifications assumed at the stage of constructing geometric and discrete models, the deformable 3D model of the scissors-type bridge needs verification. Verification of the reliability of models was performed by comparing deflections obtained in the different load modes that corresponded with tests performed on the test stand. It has been shown that the examined changes in conditions of loading the treadways of the bridge are of the greatest effect to the effort of the area of the joint which is attached to the girder bottom. Stress concentrations determined in the analysis are not hazardous to safe operation of the structure.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 1; 103-112
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Numerically predicted J-integral as a measure of crack driving force for steels 1.7147 and 1.4762

Autorzy:

Vukelic, G.
Brnic, J.

Powiązania:

https://bibliotekanauki.pl/articles/281147.pdf

Data publikacji:

2017

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

crack
steel 1.7147
steel 1.4762
FE analysis

Opis:

Fracture behavior of two types of steel (1.4762 and 1.7147) is compared based on their numerically obtained J-integral values. The J-integral are chosen to quantify the crack driving force using the finite element (FE) stress analysis applied to single-edge notched bend (SENB) and compact tensile (CT) type fracture specimens. The resulting J-values are plotted for growing crack length (∆a – crack length extension) at different a/W ratios (a/W – relative crack length; 0.25, 0.5, 0.75). Slightly higher resulting values of the J-integral for 1.4762 than 1.7147 can be noticed. Also, higher a/W ratios correspond to lower J-integral values of the materials and vice versa. J-integral values obtained by using the FE model of the CT specimen give somewhat conservative results when compared with those obtained by the FE model of the SENB specimen.

Źródło:

Journal of Theoretical and Applied Mechanics; 2017, 55, 2; 659-666
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Numerical study of selected military vehicle chassis subjected to blast loading in terms of tire strength improving

Autorzy:

Baranowski, P.
Malachowski, J.

Powiązania:

https://bibliotekanauki.pl/articles/199788.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

blast loading
LAV
tire
FE analysis
opona
analiza MES

Opis:

In the paper a chosen model of the light armoured vehicle was tested in terms of blast loading. More precisely, the blast propagation and interaction with the tire behaviour and suspension system elements of the light-armoured vehicle (LAV) was simulated. The chosen military vehicle meets the requirements of levels 2A and 2B of STANAG 4569 standard. Based on the obtained results, two modifications were proposed for the strength and resistance improvement of the wheel. The first consisted of inserting the rubber runflat ring inside the tire, whereas in the second the honeycomb-like composite wheel was implemented. Non-linear dynamic simulations were carried out using the explicit LS-Dyna code, with multi-material Arbitrary Lagrangian-Eulerian formulation for simulation the blast process.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 4; 867-878
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Dynamic testing of copper material : numerical approach

Autorzy:

Baranowski, P.
Małachowski, J.
Mazurkiewicz, Ł.
Damaziak, K.

Powiązania:

https://bibliotekanauki.pl/articles/387353.pdf

Data publikacji:

2013

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

miedź
sprężanie
analiza elementów skończonych
SHPB
copper
compression
FE analysis

Opis:

Split Hopkinson pressure bar (SHPB) is one of the most important and recognisable apparatus used for characterizing the dynamic behaviour of various materials. Incident pulse generated one the incident bar usually have a rectangular shape, which is proper for some materials but for others is not. Therefore, several methods of shaping the incident pulse are used for obtaining constant strain rate conditions during tests. Very often pulse shapers made of copper or similar material are implemented due to its softness properties. In this paper such material was investigated using the FE model of SHPB. Its mechanical behaviour was characterised with and without copper disc between the striker and incident bar. Numerical simulations were carried out using explicit LS-DYNA code. Two different methods were used for modelling the copper sample: typical finite Lagrangian elements and meshless Smoothed Particle Hydrodynamics (SPH) method. As a result of two techniques used axial stress-strain characteristics were compared for three different striker’s velocity with an influence of the copper pulse shaper taking into account. Finally, FE and SPH method was compared with taking into consideration: the efficiency, computer memory and power requirements, complexity of methods and time of simulation.

Źródło:

Acta Mechanica et Automatica; 2013, 7, 4; 195-202
1898-4088
2300-5319

Pojawia się w:

Acta Mechanica et Automatica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Experimental and numerical tests of separated side lock of intermodal wagon

Autorzy:

Barnat, W.
Krasoń, W.
Bogusz, P.
Stankiewicz, M.

Powiązania:

https://bibliotekanauki.pl/articles/246770.pdf

Data publikacji:

2014

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

intermodal transport
railway wagon
strength test
FE analysis
Aramis
experiment

Opis:

The object of the paper is to investigate the strenght of a separated subsystem of a wagon for transport of trucks semitrailers. The wagon designed in the Department of Mechanics and Applied Computer Science, Military University of Technology, allows easy and independent loading, transport and unloading without any special equipment or additional platform infrastructure. It is possible to utilize it for transport of various vehicles types such as tractors, cars, semitrailers, containers, heavy equipment. The tests presented in the paper concern a wagon separated construction element – a side lock. It is a key subsystem of the platform allowing transfer of its loads generated in the transport position (a wagon ready to go) to the form of longitudinal forces operating in the sides of the structure. The locks are simultaneously the most strained parts of the wagon. There were carried out the numerical analyses and experimental studies of a single lock were carried out. Owing to the application of Aramis non-contact optical system of strains measurement, the lock deformations as well as the areas of the minimum and maximum main deformations were defined.

Źródło:

Journal of KONES; 2014, 21, 1; 15-22
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Thermomechanical FE analysis of the engine piston made of composite material with low histeresis

Autorzy:

Szurgott, P.
Niezgoda, T.

Powiązania:

https://bibliotekanauki.pl/articles/244407.pdf

Data publikacji:

2011

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

engine piston
composite piston
coefficient of thermal expansion
thermal analysis
FE analysis

Opis:

The main purpose of the preliminary analyses presented in the paper was to compare the behaviour of the combustion engine piston made of different type of materials under thermal load. A thermomechanical FE analysis of the engine piston made of composite material was shown. A selected engine is installed in one of the popular polish tanks. The proposed new material is characterized by a low hysteresis – the differences of the coefficient of thermal expansion for heating and cooling are not significant. The results obtained for the piston made of a new material were compared with those for the current standard material. The piston was loaded by a temperature field inside it. Appropriate averaged thermal boundary conditions such as temperatures and heat fluxes were set on different surfaces of the FE model. FE analyses were carried out using MSC.Marc software. Development of the FE model was also presented. Geometrical CAD model of the piston was developed based on the actual engine piston, which was scanned using a 3D laser scanner. A cloud of points obtained from the scanner was processed and converted into a 3- dimensional solid model. FE model of a quarter part of the piston was developed for the preliminary analysis presented in the paper. 4-node tetrahedron finite elements were applied since there was no axial symmetry of the considered object. The temperature field inside the piston was determined and presented in the form of contour bands. Contours of displacement and stress in a radial direction were shown as well.

Źródło:

Journal of KONES; 2011, 18, 1; 645-650
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Modelling and assessment of a single pile subjected to lateral load

Autorzy:

Abbas, J. M.
Chik, Z.
Taha, M. R.

Powiązania:

https://bibliotekanauki.pl/articles/178422.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

piles
lateral response
slenderness ratio
flexural rigidity
3D FE analysis

Opis:

A three-dimensional finite element technique was used to analyse single pile lateral response subjected to pure lateral load. The main objective of this study is to assess the influence of the pile slenderness ratio on the lateral behaviour of single pile. The lateral single pile response in this assessment considered both lateral pile displacement and lateral soil resistance. As a result, modified p-y curves for lateral single pile response were improved when taking into account the influence lateral load magnitudes, pile cross sectional shape and flexural rigidity of the pile. The finite element method includes linear elastic, Mohr-Coulomb and 16-nodes interface models to represent the pile behaviour, soil performance and interface element, respectively. It can be concluded that the lateral pile deformation and lateral soil resistance because of the lateral load are always influenced by lateral load intensity and soil type as well as a pile slenderness ratio (L/D). The pile under an intermediate and large amount of loading (in case of cohesionless soil) has more resistance (low lateral displacement) than the pile embedded on the cohesion soil. In addition, it can be observed that the square-shaped pile is able to resist the load by about 30% more than the circular pile. On the other hand, pile in cohesionless soil was less affected by the change in EI compared with that in cohesive soil.

Źródło:

Studia Geotechnica et Mechanica; 2018, 40, 1; 65-78
0137-6365
2083-831X

Pojawia się w:

Studia Geotechnica et Mechanica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Strength analysis of experimental crane, using proliftor 250 rope winch as an excitation of a girder

Autorzy:

Haniszewski, T.

Powiązania:

https://bibliotekanauki.pl/articles/374181.pdf

Data publikacji:

2018

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

simulation
crane
dynamics
FE analysis
symulacja
dźwig
dynamika
analiza elementów skończonych

Opis:

The article presents the research carried out on the experimental construction of a crane, where a hoist with an AC motor without a motor control system was used as an excitation signal for the girder. The purpose of the described research is to determine the relationship between the values of the dynamic surplus factor when lifting the load with the loose rope in the initial phase of lifting and the distance of the hoist from the supporting structure. The data was obtained based on the force tests in a steel wire rope and subsequent determination of the values of stresses and deflections accompanying the selected test cases for different positions of the vibration inductor using the FE method.

Źródło:

Transport Problems; 2018, 13, 3; 131-142
1896-0596
2300-861X

Pojawia się w:

Transport Problems

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 18.

Tytuł:

Simplified computation methodology for contact forces on tapered rolling bearing with flexible parts

Autorzy:

Sapietová, A.
Novák, P.
Šulka, P.
Sapieta, M.
Jakubovičová, L.

Powiązania:

https://bibliotekanauki.pl/articles/196269.pdf

Data publikacji:

2018

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

contact force
cone bearing
ANSYS
FE analysis
siła styczna
łożysko stożkowe

Opis:

Durability calculations of bearings take in account the distribution of forces on rollers. Calculation of these forces in flexibly supported rings is the aim of the paper. We use simplified finite element (FE) models of bearings, which are integrated into the external geometry. This approach can consider the stiffness of the surrounding structure as well as the clearance of the bearing rings, the misalignment of bearings, shaft deflections, and the forces of crowning rollers. The presented results show an influence of the initial radial interference of the outer ring with housing on the distribution of forces in bearing rollers. As the radial stiffness of the housing is close to the stiffness of the outer ring interference, this causes considerable deformation of the housing. The presented approach is also able to calculate the distribution of contact pressures over any rolling element.

Źródło:

Zeszyty Naukowe. Transport / Politechnika Śląska; 2018, 99; 177-182
0209-3324
2450-1549

Pojawia się w:

Zeszyty Naukowe. Transport / Politechnika Śląska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Strength testing of side connector of railway wagon for semitrailers transport

Autorzy:

Stankiewicz, M.
Krasoń, W.

Powiązania:

https://bibliotekanauki.pl/articles/245060.pdf

Data publikacji:

2016

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

intermodal railway wagon
strength test
FE analysis of the side connector (lock)

Opis:

A prototype railway wagon with a rotatable platform for an intermodal system is developed in Military University of Technology. The special railway wagon is equipped with a rotatable low flat loading floor. It can be used for transporting various types of vehicles, for example, tractors, trucks, trailers, semitrailers, cargo containers. The special wagons allows quick and convenient self-loading and unloading of vehicles and containers (no cranes needed); no platform infrastructure is required, only hardened flat surface; there is no need for hubs, terminals or special logistics; each wagon can be operated separately. A considered wagon consists of the following elements: chassis with biaxial standard Y25 bogies, frame, platform body, pneumatic systems, buffer devices, other external devices, electric equipment and hydraulic systems. A mechanism blocking rotation of a rotatable platform during transport of the load (typical semitrailers) is very important from a functionality and strength point of view of the considered wagon. Construction of such a lock allows only transmission of longitudinal load. Based on the performed FE analysis and strength tests of the wagon, it was verified that the most strenuous component of the wagon with a rotatable loading platform is a connector (lock) coupling the side of the rotatable platform with the over bogie part of the frame wagon. The selected aspects of numerical and experimental studies of the prototype railway wagon and its components are presented in the paper. FE analyses of the side lock element separated from the wagon structure are discussed as well.

Źródło:

Journal of KONES; 2016, 23, 2; 349-356
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Computer Aided Design of Wires Extrusion from Biocompatible Mg-Ca Magnesium Alloy
Opracowanie za pomocą modelowania numerycznego procesu wyciskania cienkich prętów z biokompatybilnego stopu magnezu, zawierającego dodatek Ca

Autorzy:

Milenin, A.
Gzyl, M.
Rec, T.
Płonka, B.

Powiązania:

https://bibliotekanauki.pl/articles/355758.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

magnesium alloys
extrusion
ductile fracture
FE analysis
stopy magnezu
wyciskanie
analiza MES

Opis:

Mathematical model of small-diameter wires extrusion from biocompatible MgCa08 (Mg - 0.8% Ca) magnesium alloy was developed in the current paper in order to determine window of allowable technological parameters. Compression and tensile tests were carried out within temperature range 250-400°C and with different strain rates to determine the fracture conditions for the studied alloy. Finite element (FE) analysis was used to predict the billet temperature evolution and material damage during processing. The extrusion model takes into account two independent fracture mechanisms: a) surface cracking due to exceeding of the incipient melting temperature and b) utilization of material formability. FE simulations with different initial billet temperatures and pressing speeds were performed in order to determine the extrusion limit diagram (ELD) for MgCa08 magnesium alloy. The developed ELD was used to select the parameters for the direct extrusion of wires with diameter of 1 mm. Then, the extrusion of twelve wires was conducted at 400°C with pressing speed 0.25 mm/s. It was reported that the obtained wires were free from defects, which confirmed the good agreement between numerical and experimental results.
W pracy zaproponowano model matematyczny procesu wyciskania prętów o małych średnicach z biokompatybilnego stopu magnezu MgCa08 (Mg - 0.8% Ca). Na podstawie opracowanego modelu możliwy jest dobór parametrów technologicznych rozpatrywanego procesu. Model procesu wyciskania zawiera model do prognozowania utraty spójności materiału, który został opracowany w oparciu o próby spęczania oraz jednoosiowego rozciągania w zakresie temperatur 250-400°C dla różnych prędkości odkształcenia. W oparciu o metodę elementów skończonych (MES) przeprowadzona została analiza numeryczna rozkładu temperatury oraz wskaźnika wykorzystania odkształcalności materiału w procesie wyciskania. Zaproponowany model zawiera dwa możliwe mechanizmy utraty spójności: a) wynikający z lokalnego przekroczenia temperatury topnienia, b) wynikający z wyczerpania zapasu plastyczności. W oparciu o przeprowadzoną analizę MES procesu wyciskania dla różnych temperatur oraz prędkości wyciskania opracowano diagram ELM (extrusion limit diagram) dla stopu MgCa08. Na podstawie opracowanego diagramu ELM dobrano parametry procesu wyciskania prętów o średnicy 1 mm. Weryfikację modelu procesu wyciskania dla stopu MgCa08 wykonano w warunkach laboratoryjnych, gdzie przeprowadzono dwunasto żyłowy proces wyciskania prętów w temperaturze 400°C i prędkości 0.25 mm/s. Otrzymane pręty były| wolne od wad. co potwierdziło dobrą zgodność pomiędzy wynikami numerycznymi i eksperymentalnymi.

Źródło:

Archives of Metallurgy and Materials; 2014, 59, 2; 551-556
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 21.

Tytuł:

Numerical investigation of the influence of a rigid obstacle on the multiple reflected pressure impulse

Autorzy:

Barnat, W.
Panowicz, R.
Niezgoda, T.

Powiązania:

https://bibliotekanauki.pl/articles/247658.pdf

Data publikacji:

2010

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

pressure impulse
analytical model
FE analysis
influence of the obstacle on the reflected wave

Opis:

The article presents the case of multiple reflection ofa blast wave from a rigid obstacle. The pressure impulse was generated in the Euler domain according to Taylor-Sedov theory. Additionally, there the results of numerical and analytical investigations on the behaviour of the reflected pressure impulse from the flat stiff obstacle were discussed. The analytical considerations are pursuant to the accessible literature. This case is identical with the explosion under a flat bottom of the tank-type vehicle or BWP. All the considered obstacles which are influence by the pressure impulse are similar to the construction of the vehicles used by Polish Army. As it was mentioned above, the numerical investigations were supported by analytical modelsfrom the scientific literature. In the previous papers, the authors conducted the numerical and experimental investigations on the flat blast wave. Those papers concentrated on the selection of the Euler domain parameters and parameters describing an explosive charge for numerical analyses. Additionally, the parameters of the boundary elements of the Euler domain were selected in order to unable the uncontrolled influence of gases. The innovation presented in the paper is the description of the issue of the numerical problem of multiple pressure impulse reflection from a rigid obstacle. The presented papers aim at increasing the safety of the military vehicles crews during the stabilisation missions in Iraq and Afghanistan.

Źródło:

Journal of KONES; 2010, 17, 4; 45-54
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 22.

Tytuł:

FE analysis of current displacement phenomena in a squirrel cage motor working at cryogenic temperature

Autorzy:

Barański, M.

Powiązania:

https://bibliotekanauki.pl/articles/950666.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

FE analysis of submerged induction motor
cryogenic temperature
coupled electromagnetic-thermal phenomena
current displacement

Opis:

The paper presents the special software for transient FE analysis of coupled electromagnetic-thermal problems in a squirrel cage submerged motor working at cryogenic temperature. A time-stepping finite element method and transients analysis of an induction motor has been applied. The non-linearity of the magnetic circuit, the movement of the rotor, skewed slots, and the influence of temperature on electric and thermal properties of the materials has been taken into account. Developed on the basis of presented algorithm a computer program used to analyze the phenomenon of current displacement in the rotor bars of high-voltage cage induction motor working in cryogenic conditions. The results of the simulations are presented.

Źródło:

Archives of Electrical Engineering; 2014, 63, 2; 139-147
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Optimal selection of dental implant for different bone conditions based on the mechanical response

Autorzy:

Roy, S.
Das, M.
Chakraborty, P.
Biswas, J. K.
Chatterjee, S.
Khutia, N.
Saha, S.
Roychowdhury, A.

Powiązania:

https://bibliotekanauki.pl/articles/307549.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

wytrzymałość kości
implanty stomatologiczne
analiza FEM
pacjent
bone condition
porous dental implant
FE Analysis
patient specific

Opis:

Bone quality varies from one patient to another extensively; also, Young’s modulus may deviate up to 40% of normal bone quality, which results into alteration of bone stiffness immensely. The prime goal of this study is to design the optimum dental implant considering the mechanical response at bone implant interfaces for a patient with specific bone quality. Method. 3D model of mandible and natural molar tooth were prepared from CT scan data while, dental implants were modelled using different diameter, length and porosity and FE analysis was carried out. Based on the variation in bone density, five different bone qualities were considered. First, failure analysis of implants, under maximum biting force of 250N had been performed; next, the implants, those survived were selected for observing the mechanical response at bone implant interfaces under common chewing load of 120N. Result. Maximum Von Mises stress did not surpass the yield strength of the implant material (TiAl4V). However, factor of safety of 1.5 was considered and all but two dental implants survived the design stress or allowable stress. Under 120N load, distribution of Von Mises stress and strain at the bone-implant interface corresponding to the rest of the implants for five bone conditions were obtained and enlisted. Conclusion. Implants, exhibiting interface strain within 1500-3000 microstrain range show the best bone remodelling and osseointegration. So, implant models, having this range of interface strains were selected corresponding to the particular bone quality. A set of optimum dental implants for each of the bone qualities were predicted.

Źródło:

Acta of Bioengineering and Biomechanics; 2017, 19, 2; 11-20
1509-409X
2450-6303

Pojawia się w:

Acta of Bioengineering and Biomechanics

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 24.

Tytuł:

Evaluation of sand p–y curves by predicting both monopile lateral response and OWT natural frequency

Autorzy:

Amel, Douifi
Djillali, Amar Bouzid
Subhamoy, Bhattacharya
Nasreddine, Amoura

Powiązania:

https://bibliotekanauki.pl/articles/2073761.pdf

Data publikacji:

2022

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

FE analysis
p–y curve
Winkler model
cohesionless soil
monopile
offshore wind turbine
natural frequency
soil–monopile stiffness

Opis:

Extending the use of the p–y curves included in the regulation codes API and DNV to design large-diameter monopiles supporting offshore wind turbines (OWTs) was unsuccessful as it resulted in an inaccurate estimation of the monopile behavior. This had prompted many investigators to propose formulations to enhance the performances of Winkler model. In this paper, two case studies are considered. A case consisting of an OWT at Horns Rev (Denmark) supported by a monopile in a sandy soil was studied first. Taking the FEA using ABAQUS as reference, results of WILDOWER 1.0 (a Winkler computer code) using the recently proposed p–y curves giving design parameters were plotted and evaluated. In order to see the ability of proposed p–y curves to predict the monopile head movements, and consequently the first natural frequency (1st NF), a second case study consisting of a monopile supporting an OWT at North Hoyle (UK) was selected. The monopile head stiffness in terms of lateral, rocking, and cross-coupling stiffness coefficients, necessary for the 1st NF, were computed using both ABAQUS and WILDPOWER 1.0. Comparisons with the measured 1st NF showed that with the exception of one p–y model, none of other proposed Winkler methods is able to predict accurately this parameter.

Źródło:

Studia Geotechnica et Mechanica; 2022, 44, 1; 66--81
0137-6365
2083-831X

Pojawia się w:

Studia Geotechnica et Mechanica

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 25.

Tytuł:

Identification of layers distribution in the composite coupon using finite element method and three point bending test

Autorzy:

Mazurkiewicz, Ł.
Małachowski, J.
Damaziak, K.
Baranowski, P.
Gotowicki, P.

Powiązania:

https://bibliotekanauki.pl/articles/387164.pdf

Data publikacji:

2013

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

fibre reinforced composite
FE analysis
hand lay-up technique
experimental validation
kompozyt włóknisty
analiza elementów skończonych
weryfikacja doświadczalna

Opis:

The main objective of the study is to develop experimentally validated FE model and perform numerical analysis of layered composites made by hand lay-up techniques during tension and bending test. The research object is glass - polyester laminate made of four unidirectional layers. In order to validate the numerical models experimental test were performed. Due to the very different stiffness modulus in tension and bending loading the material properties obtained from standard test are not suitable to apply in numerical model. Significantly different behaviour compared to experimental test was obtained for tree point bending where the numerical model becomes too stiff. Simple coupons, relatively easy to manufacture presented in the paper have very low quality. The differences in actual and theoretical bending stiffness (obtained from tension stiffness) exceed 70%. In order to represent the actual structure the layers of the composite were divided by resin layers and also additional resin layer at the top and bottom of the model were defined. Single stage optimization process was used to adjust the material layout. After layer set-up modification very significant improvement can be seen for flexural behaviour.

Źródło:

Acta Mechanica et Automatica; 2013, 7, 3; 160-165
1898-4088
2300-5319

Pojawia się w:

Acta Mechanica et Automatica

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 26.

Tytuł:

Bone Remodelling Model Incorporating Both Shape and Internal Structure Changes by Three Different Reconstruction Mechanisms. A Lumbar Spine Case
Model przebudowy kości uwzględniający zmiany struktury i kształtu spowodowane trzema różnymi mechanizmami przebudowy. Przypadek kręgosłupa lędźwiowego

Autorzy:

Wymysłowski, P.
Zagrajek, T.

Powiązania:

https://bibliotekanauki.pl/articles/140072.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

bone remodelling
artificial disc
lumbar spine
FE analysis
model przebudowy kości
sztuczny krążek międzykręgowy
kręgosłup lędźwiowy
analiza MES

Opis:

The paper presents a method of analysis of bone remodelling in the vicinity of implants. The authors aimed at building a model and numerical procedures which may be used as a tool in the prosthesis design process. The model proposed by the authors is based on the theory of adaptive elasticity and the lazy zone concept. It takes into consideration not only changes of the internal structure of the tissue (described by apparent density) but also surface remodelling and changes caused by the effects revealing some features of “creep”. Finite element analysis of a lumbar spinal segment with an artificial intervertebral disc was performed by means of the Ansys system with custom APDL code. The algorithms were in two variants: the so-called site-independent and site-specific. Resultant density distribution and modified shape of the vertebra are compared for both of them. It is shown that this two approaches predict the bone remodelling in different ways. A comparison with available clinical outcomes is also presented and similarities to the numerical results are pointed out.
Artykuł prezentuje metodę analizy przebudowy kości w otoczeniu implantów. Celem pracy było opracowanie modelu i procedur numerycznych mogących służyć jako narzędzie wspomagające projektowanie protez. Zaproponowany przez autorów model opiera się na teorii adaptacyjnej sprężystości i koncepcji strefy martwej. Uwzględnia on nie tylko zmiany struktury wewnętrznej tkanki (opisanej przez gęstość pozorną), ale także przebudowę powierzchniową i zmiany związane z efektami wykazującymi pewne cechy “pełzania”. Przeprowadzona została analiza metodą elementów skończonych segmentu ruchowego kręgosłupa ze sztucznym krążkiem międzykręgowym z wykorzystaniem systemu Ansys i własnego kodu APDL. Algorytmy zbudowano w dwóch wariantach: tzw. niezależnym i zależnym od miejsca. Porównano uzyskane rozkłady gęstości i zmiany kształtu pokazując, że obydwa warianty przebudowę kości przewidują w różny sposób. Zaprezentowano również porównanie wyników numerycznych z badaniami klinicznymi wskazując na ich podobieństwa.

Źródło:

Archive of Mechanical Engineering; 2016, LXIII, 4; 549-563
0004-0738

Pojawia się w:

Archive of Mechanical Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 27.

Tytuł:

Eksperymentalno-numeryczne badania modernizowanego mostu towarzyszącego BLG-67M
Experimental and numerical testing of the modernized BLG-67M bridge

Autorzy:

Dacko, M.
Krasoń, W.
Filiks, Ł.

Powiązania:

https://bibliotekanauki.pl/articles/208664.pdf

Data publikacji:

2011

Wydawca:

Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego

Tematy:

modernizowany most towarzyszący
badania eksperymentalne
analiza numeryczna MES
modernized AVLB scissors-type bridge
experimental test
numerical FE analysis

Opis:

Przedmiotem badań przedstawionych w pracy jest modernizowany most towarzyszący. Most taki charakteryzuje się wysoką mobilnością i modułową budową. Pojedynczy moduł–przęsło składa się z dwóch dźwigarów - kolein z jezdniami i konstrukcjami wsporczymi połączonych złączami sworzniowymi. Przęsło mostu jest rozkładane automatycznie za pomocą mechanicznego układacza transportowanego razem z mostem na podwoziu gąsienicowym. Omówiono wybrane problemy badań eksperymentalnych pojedynczego przęsła mostu nożycowego BLG (oznaczenie producenta). Podczas testu na stanowisku zarejestrowano przemieszczenia i odkształcenia w wybranych przekrojach konstrukcji odpowiadające różnym wariantom obciążeń. Próby obciążeniowe zrealizowano na zmodernizowanym moście BLG. Ich wyniki umożliwiły zweryfikowanie poprawności modeli numerycznych MES, które będą zastosowane do oceny rozkładów naprężeń w analizowanej konstrukcji.
Modernized AVLB scissor-type bridge is a subject of studies presented in a paper. This bridge is characterized by high mobility and modular structure. Single module-span consists of two spanning parts of the bridge - two main trucks and support structure joined with a coupling pin. The bridge span is extended automatically by means of a mechanical bridge-laying gear carried together with bridge sections on a self-propelled chassis. Some aspects of an experimental test of the single-span scissors-type BLG (a manufacturer's designation) bridge were discussed. Displacements and strains in particular sections of the structure were measured during field tests with different load modes. Load tests performed on a modernized BLG bridge structure made it possible to verify the correctness of numerical FE models, which will be used for assessing stress distribution in the analyzed structure.

Źródło:

Biuletyn Wojskowej Akademii Technicznej; 2011, 60, 1; 289-307
1234-5865

Pojawia się w:

Biuletyn Wojskowej Akademii Technicznej

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 28.

Tytuł:

Numerical Modelling and Experimental Testing on Polyurethane Adhesively Bonded Joints Behaviour in Wood-Wood and Wood-Carbon Fibre Reinforced Polymer Layouts

Autorzy:

Kawecki, Bartosz

Powiązania:

https://bibliotekanauki.pl/articles/2201917.pdf

Data publikacji:

2023

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

FE analysis
adhesively bonded joints
wood-wood joints
Wood-CFRP joints
double-lap connection
cohesive stiffness
cohesive strength
delamination

Opis:

Scientists do a variety of laboratory tests on timber and wood-containing composites. An example is adhesively bonded joints in such materials. Despite a wide range of empirical research, consideration of adhesive layers or surfaces in a structure is commonly done in a very simplified manner - they are often modelled as a perfect connection between adherends. It means the cohesive stiffness and opportunity of progressive delamination are neglected. This may lead to an overestimation of the structural load-bearing capacity. The article presents wood-wood and wood-CFRP adhesively bonded joints’ investigations, based on own experimental testing technique (covering a current one as a Digital Image Correlation), analytical double-lap model for adhesives and advanced numerical Finite Element approach. The aim of the paper is to give the guidelines for complex, non-linear modelling of connections in glue laminated timber and wood-CFRP composites that can be utilised for many purposes.

Źródło:

Advances in Science and Technology. Research Journal; 2023, 17, 2; 36--52
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 29.

Tytuł:

Badania maszyny elektrycznej z zagnieżdżonymi magnesami trwałymi i barierami magnetycznymi
Research of electrical machine with embedded permanent magnets and flux barriers

Autorzy:

Wardach, M.
Pałka, P.
Paplicki, P.
Bonisławski, M.
Grochocki, P.

Powiązania:

https://bibliotekanauki.pl/articles/1199460.pdf

Data publikacji:

2017

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel

Tematy:

maszyny elektryczne
magnesy trwałe
badania symulacyjne
badania eksperymentalne
pojazd elektryczny
electrical machines
permanent magnets
FE analysis
experimental research
electric vehicle

Opis:

The paper presents an electric machine prototype with embedded permanent magnets and magnetic barriers for electric vehicle drive. Selected experimental results compared with simulation results carried out by using Ansys Maxwell have also been presented. Individual stages of design and construction of the proposed machine have been reported. The aim of the work was to build and to test the prototype of electric machine with permanent magnet dedicated to the electric vehicle drive. The machine should have a high ratio of inductances in the q-axis to the d-axis, low values of cogging torque and low torque ripples. On the basis of simulation study, carried out for different topologies, the selection of the rotor structure with the favorite magnetic parameters has been done. A prototype machine was built based on the stator and housing from 6.3 kW induction motor M3AA 132 MC 8 series.
W pracy przedstawiono prototypową maszynę elektryczną z zagnieżdżonymi magnesami trwałymi oraz barierami magnetycznymi, dedykowaną do napędu pojazdu elektrycznego. W artykule zamieszczono wybrane wyniki badań symulacyjnych prototypu, otrzymane przy użyciu programu Ansys Maxwell, a także rezultaty badań eksperymentalnych przeprowadzone na modelu fizycznym. Zaprezentowane zostały poszczególne etapy prac projektowych i konstrukcyjnych opracowanej maszyny. Celem pracy było wykonanie i zbadanie prototypu maszyny elektrycznej z magnesami trwałymi dedykowanej do napędu pojazdu elektrycznego o wysokim stosunku indukcyjności w osi q do indukcyjności w osi d, niskiej wartości momentu zaczepowego i pulsacji. Na podstawie przeprowadzonych badań symulacyjnych różnych topologii, dokonano wyboru struktury wirnika o pożądanych parametrach magnetycznych. Model eksperymentalny zbudowano na bazie stojana i obudowy seryjnego silnika asynchronicznego M3AA 132 MC 8 o mocy 6,3 kW.

Źródło:

Maszyny Elektryczne: zeszyty problemowe; 2017, 2, 114; 135-140
0239-3646
2084-5618

Pojawia się w:

Maszyny Elektryczne: zeszyty problemowe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Analiza zjawiska wypierania prądu w silniku indukcyjnym pracującym w temperaturze kriogenicznej
Analysis of Current Displacement Phenomena in a Squirrel Cage Motor Working at Cryogenic Temperature

Autorzy:

Barański, M.

Powiązania:

https://bibliotekanauki.pl/articles/1368739.pdf

Data publikacji:

2013

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel

Tematy:

wysokonapięciowy silnik klatkowy
temperatura kriogeniczna
wypieranie prądu
analiza
FE analysis of submerged induction motor
cryogenic temperature
coupled electromagnetic-thermal phenomena
current displacement

Opis:

The paper presents an algorithm for transient FE analysis of coupled electromagnetic-thermal phenomena in a squirrel cage submerged motor working at cryogenic temperature. The non-linearity of the magnetic circuit, the movement of the rotor, skewed slots, and the influence of temperature on electric and thermal properties of the materials has been taken into account. Developed on the basis of presented algorithm a computer program used to analyze the phenomenon of current displacement in the rotor bars of high-voltage cage induction motor working in cryogenic. The results of the simulations are presented.
W artykule przedstawiono polowy algorytm analizy sprzężonych zjawisk elektromagnetycznych, cieplnych i mechanicznych w silniku indukcyjnym. W rozważaniach uwzględniono skos żłobków, nasycanie się ferromagnetyka oraz wpływ temperatury na właściwości elektryczne, cieplne i magnetyczne materiałów. Opracowany na jego podstawie program obliczeniowy wykorzystano do analizy zjawiska wypierania prądu w prętach uzwojenia klatkowego wysokonapięciowego silnika indukcyjnego pracującego w warunkach kriogenicznych. Przedstawiono wybrane rezultaty badań oraz wynikające z nich wnioski.

Źródło:

Maszyny Elektryczne: zeszyty problemowe; 2013, 4, 100/2; 9-12
0239-3646
2084-5618

Pojawia się w:

Maszyny Elektryczne: zeszyty problemowe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

CO2 laser spot welding of thin sheets AISI 321 austenitic stainless steel

Autorzy:

Shehab, A. A.
Nawi, S. A.
Al-Rubaiy, A. AAG
Hammoudi, Z.
Hafedh, S. A.
Abass, M. H.
Alali, M. S.
Ali, S. D.

Powiązania:

https://bibliotekanauki.pl/articles/1818484.pdf

Data publikacji:

2020

Wydawca:

Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach

Tematy:

thin sheet metal
austenitic stainless steel
CO2 CW LSW
mechanical properties
welding profile
FE analysis
blachy cienkie
stal austenityczna nierdzewna
właściwości mechaniczne
profil spawalniczy
analiza elementów skończonych

Opis:

Purpose: The present work aims to investigate the influence of CO2 laser spot welding (LSW) parameters on welding profile and mechanical properties of lap joint of AISI 321 thin sheet metals, and analyze the welding profile numerically by finite element (FE) method. Design/methodology/approach: The weld carried out using 150 W CO2 continues wave laser system. The impact of exposure time and laser power on the welding profile was investigated using an optical microscope. Microhardness and tensile strength tests were used to evaluate the mechanical properties of the joint. Ansys software was utilized to simulate the welding profile numerically. Findings: The results revealed that 2 s exposure time and 50 W power have led to uniform welding profile and highest shear force (340 N), lower hardness gradient across the heat affected zone (HAZ) and fusion zone (FZ). Finite element (FE) analysis of the welding profile showed good agreement with experimental analysis. Research limitations/implications: The selection of laser spot welding parameters for thin sheet metal was critical due to the probability of metal vaporisation with extra heat input during welding. Practical implications: Laser welding of AISI 321 steel is used in multiple industrial sectors such as power plants, petroleum refinement stations, pharmaceutical industry, and households. Thus, selecting the best welding parameters ensures high-quality joint. Originality/value: The use of CO2 laser in continuous wave (CW) mode instead of pulse mode for spot welding of thin sheet metal of AISI 321 austenitic stainless steel consider a real challenge because of the difficulty of control the heat input via proper selection of the welding parameters in order to not burn the processed target. Besides, the maintenance is easier and operation cost is lower in continuous CO2 than pulse mode.

Źródło:

Archives of Materials Science and Engineering; 2020, 106, 2; 68--77
1897-2764

Pojawia się w:

Archives of Materials Science and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Numerical analysis of effectiveness of strengthening concrete slab in tension of the steel-concrete composite beam using pretensioned CFRP strips
Analiza numeryczna skuteczności wzmocnienia wstępnie naprężonymi taśmami CFRP rozciąganej płyty stalowo-betonowej belki zespolonej

Autorzy:

Jankowiak, I.
Madaj, A.

Powiązania:

https://bibliotekanauki.pl/articles/396603.pdf

Data publikacji:

2017

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

composite beam
FE analysis
CFRP strips
strengthening of composite beam
concrete in tension
Concrete Damage Plasticity model
belka zespolona
analiza MES
taśmy CFRP
wzmacnianie belek zespolonych
beton rozciągany
beton plastyczny

Opis:

One of the methods to increase the load carrying capacity of the reinforced concrete (RC) structure is its strengthening by using carbon fiber (CFRP) strips. There are two methods of strengthening using CFRP strips - passive method and active method. In the passive method a strip is applied to the concrete surface without initial strains, unlike in the active method a strip is initially pretensioned before its application. In the case of a steel-concrete composite beam, strips may be used to strengthen the concrete slab located in the tension zone (in the parts of beams with negative bending moments). The finite element model has been developed and validated by experimental tests to evaluate the strengthening efficiency of the composite girder with pretensioned CFRP strips applied to concrete slab in its tension zone.
Jednym ze sposobów zwiększenia nośności konstrukcji betonowej jest jej wzmocnienie przez zastosowanie taśm z włókien węglowych (CFRP). Wzmacnianie polega na mocowaniu lub doklejaniu ich do powierzchni konstrukcji. Stosuje się dwa sposoby mocowania taśm: tzw. sposób bierny lub czynny, czyli bez lub z wcześniejszym napięciem taśmy przed jej aplikacją na wzmacnianej konstrukcji. W przypadku stalowo-betonowych konstrukcji zespolonych taśmy mogą mieć zastosowanie do wzmacniania płyty betonowej w strefie działania momentów powodujących jej rozciąganie. Jednym ze sposobów znalezienia najbardziej skutecznego sposobu wzmocnienia przed jej zastosowaniem jest wykorzystanie symulacji numerycznych. Wymaga to opracowania poprawnego modelu obliczeniowego, który musi być zweryfikowany badaniami empirycznymi. Autorzy artykułu opracowali taki model numeryczny i zastosowali go do oceny skuteczności wzmocnienia omawianego typu dźwigara zespolonego taśmami CFRP wstępnie naprężonymi.

Źródło:

Civil and Environmental Engineering Reports; 2017, No. 27(4); 5-15
2080-5187
2450-8594

Pojawia się w:

Civil and Environmental Engineering Reports

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Modelling of bolts in multi-bolted connections using Midas NFX

Autorzy:

Grzejda, R.

Powiązania:

https://bibliotekanauki.pl/articles/298303.pdf

Data publikacji:

2015

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Tematy:

multi-bolted connection
FE modelling
stiffness analysis
load analysis

Opis:

In the paper a fragment of research on development of modelling methods of asymmetrical multi-bolted flange connections is presented. The effect of the bolt modelling method in a single bolted joint on both the stiffness characteristics of elements joined in the multi-bolted flange connection and bold forces have been examined. An analysis of the multi-bolted flange connection is carried out for selected models created using the finite element method (FEM). Guidelines for the selection of the bolt modelling method in the case of both the stiffness analysis and the load analysis of multi-bolted flange connections have been pointed out.

Źródło:

Technical Sciences / University of Warmia and Mazury in Olsztyn; 2015, 18(1); 61-68
1505-4675
2083-4527

Pojawia się w:

Technical Sciences / University of Warmia and Mazury in Olsztyn

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Structural and Magnetic Studies of the LaFe_{11.2}Co_{0.7-x}Mn_xSi_{1.1} (where x=0.1, 0.2) Alloys

Autorzy:

Gębara, P.
Marcin, J.
Glińska, A.
Wysłocki, J.

Powiązania:

https://bibliotekanauki.pl/articles/1029779.pdf

Data publikacji:

2018-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

La(Fe,Si)₁₃
magnetocaloric effect
scaling analysis

Opis:

The aim of present work was to study the influence of partial substitution of Co by Mn in the LaFe_{11.2}Co_{0.7}Si_{1.1} alloy on its structure and magnetic properties. The X-ray diffraction studies revealed coexistence of dominant pseudobinary fcc La(Fe,Si)_{13}-type phase with minor fraction of α-Fe. Moreover, the increase of Mn content causes decrease of the lattice parameter and the Curie temperature. The values of magnetic entropy change obtained for both investigated alloys are almost identical and close to 12 J/(kg K) under the change of external magnetic field ≈5 T. Investigations of magnetic phase transition confirmed its second order nature in the case of both specimens.

Źródło:

Acta Physica Polonica A; 2018, 133, 2; 232-235
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Morphology convenient flower like nanostructures of CdO-SiO2 nanomaterial and its photocatalytic application

Autorzy:

Kamalakkannan, J.
Senthilvelan, S.

Powiązania:

https://bibliotekanauki.pl/articles/1182834.pdf

Data publikacji:

2017

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

FE-SEM; HR-TEM; Photocatalytic activity; •OH analysis

Opis:

Highly efficient CdO-SiO2 nanomaterial was synthesized by Sol-gel method and sonication technique. The nanomaterial was characterized by Field-emission Scanning electron microscopy (FE-SEM) with elementary dispersive X-ray (EDX), High-resolution transmission electron microscopy (HR-TEM), photoluminescence spectroscopy (PL) and Ultraviolet-Visible diffuse reflectance spectra (DRS). The photocatalytic activity of CdO-SiO2 nanomaterial was studied from the photodegradation of Rh B as it has maximum efficiency at pH = 7 under UV-light irradiation at 365 nm. The photodegradation of dye various Catalyst loading and dye concentration is parameters have been studied. The hydroxyl radical formation in the mechanism was confirmed by fluorescence quenching technique. The mineralization of dye is confirmed by chemical oxygen demand measurements. An achievable mechanism is proposed for higher activity of CdO-SiO2 under UV-light at 365 nm. This catalyst was found to be stable and reusable.

Źródło:

World Scientific News; 2017, 62; 46-63
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Functional and Fractal Properties of Fe-Al Coatings After Gas Detonation Spraying (GDS)

Autorzy:

Chrostek, T.
Rychlik, K.
Bramowicz, M.
Senderowski, C.

Powiązania:

https://bibliotekanauki.pl/articles/355023.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Fe-Al
intermetallic alloys
GDS
SEM
fractal analysis

Opis:

The paper presents the results and provides an analyse of the geometric structure of Fe-Al protective coatings, gas-treated under specified GDS conditions. The analysis of the surface topography was conducted on the basis of the results obtained from the SEM data. Topographic images were converted to three-dimensional maps, scaling the registered amplitude coordinates of specific gray levels to the relative range of 0÷1. This allowed us to assess the degree of surface development by determining the fractal dimension. At the same time, the generated three-dimensional spectra of the autocorrelation function enabled the researchers to determine the autocorrelation length (S_al) and the degree of anisotropy (S_tr) of the surfaces, in accordance with ISO 25178. Furthermore, the reconstructed three-dimensional images of the topography allowed us to evaluate the functional properties of the studied surfaces based on the Abbott-Firestone curve (A-F), also known as the bearing area curve. The ordinate describing the height of the profile was replaced by the percentage of surface amplitude in this method, so in effect the shares of the height of the three-dimensional topographic map profiles of various load-bearing properties were determined. In this way, both the relative height of peaks, core and recesses as well as their percentages were subsequently established.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 4; 1993-1999
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Przyjazne dla środowiska katalizatory redukcji tlenku azotu otrzymane z surowców naturalnych
Environmentally friendly catalysts for reduction of nitrogen oxides derived from the natural raw material-ferrierite

Autorzy:

Ćwikła-Bundyra, W.

Powiązania:

https://bibliotekanauki.pl/articles/1217140.pdf

Data publikacji:

2012

Wydawca:

Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem

Tematy:

Co-ferieryt
Fe-ferieryt
redukcja NO
analiza chromatograficzna
Co-ferrierite
Fe-ferrierite
NO reduction
chromatographic analysis

Opis:

Selektywna katalityczna redukcja NO za pomocą metanu została przeprowadzona dla katalizatorów Co- i Fe-zeolitowych o strukturze ferierytu. Podstawienie jonu kobaltowego pozwoliło zauważyć, że powstałe formy Co w zeolicie kobaltowym mają pozytywny wpływ na przebieg SCR-NO za pomocą metanu, głównie poprzez wzrost poziomu redukcji NO do N₂. Aktywność badanych zeolitów w procesie SCR za pomocą CH₄ (w odniesieniu do ilości wprowadzonego metalu) można przedstawić następująco: Co-Fer > Fe-Fer dla kontaktów o dużej zawartości wprowadzonego metalu; dla próbek kobaltowych o średniej zawartości wprowadzonego metalu przebieg ten wygląda: Co-Fer > Fe-Fer. Najbardziej aktywne katalizatory charakteryzują się najwyższym ładunkiem metalu w strukturze zeolitu. Głównymi czynnikami wpływającymi na aktywność jonów kobaltowych wydają się być położenie kationu w wewnętrznej strukturze zeolitu, struktura koordynacyjna sieci i właściwości katalityczne jonów Co. Rezultaty przeprowadzonych badań katalitycznych pozwoliły zaobserwować przy zastosowaniu metod steady-state, że redukcja NO zachodzi z dużą szybkością na powierzchni ferierytu w temperaturze powyżej 623 K.
Selective catalytic reduction of NO with methane (CH₄-SCR) was investigated over Co- and Fe- zeolites with ferrierite structure. The exchanged Co ions have been shown to exhibit activity in CH₄-SCR of NO, while protons or Co species in Co-zeolites contributed to the CH₄-SCR activity mostly by the increase of the NO reduction towards N₂. The zeolites activity in SCR of NO (described as per metal weight) was determined as follows: Co-Fer > Fe-Fer for the highest Co loadings; for the average content of the Co ion in the zeolite (in terms of Turnovem frequency) it was comparable. The most active catalysts are characterized by the Co-laden large metal structure of the zeolite. The main factors contributing to the individual Co ions activity are suggested to be cation location in the inner zeolite structure, coordination to the framework, and catalytic ability of the Co ions. The results of the catalytic activity investigations using the steady-state methods showed that NO reduction occurs at a reasonable rate on the structure of ferrierite surface at temperatures over 623 K.

Źródło:

Chemik; 2012, 66, 6; 601-610
0009-2886

Pojawia się w:

Chemik

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Analysis Of The Extrusion Process Of A Square Tube Multi-Channel Heat Pipe
Analiza procesu wytłaczania wielokanałowych ciepłowodów o kwadratowym przekroju

Autorzy:

Kim, K. S.
Kim, J. Y.

Powiązania:

https://bibliotekanauki.pl/articles/353935.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

aluminum hot extrusion
FE simulation
stress analysis
extrusion experiment
aluminium wytłaczane na gorąco
symulacja FE
analiza naprężeń
wytłaczanie

Opis:

Heat pipes have been recently in use for cooling purposes in various fields, including electronic circuit boards and vehicle parts that generate large amounts of heat. In order to minimize the loss of heat transferred, there is a need to maximize the contact area of the working fluid. This study produced a square tube multi-channel heat pipe to replace the existing circular pipe type to maximize the internal surface area thereof. This expands the surface, allowing the working fluid to come into contact with a wider area and enhancing thermal radiation performance. A mold for the production for such a product was designed, and finite element simulation was performed to determine whether production is possible.

Źródło:

Archives of Metallurgy and Materials; 2015, 60, 2B; 1463-1466
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Influence of gas detonation spraying parameters on the geometrical structure of Fe-Al intermetallic protective coatings

Autorzy:

Chrostek, Tomasz
Bramowicz, Mirosław
Rychlik, Kazimierz
Wojtkowiak, Adam
Senderowski, Cezary

Powiązania:

https://bibliotekanauki.pl/articles/298459.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Tematy:

GDS
Detonation Gas Spraying
Fe-Al
intermetallic alloys
fractal analysis
RMS

Opis:

The paper presents the results of an analysis of the geometrical structure of Fe-Al intermetallic protective coatings sprayed under specified gun detonation spraying (GDS) conditions. Two barrel lengths, two powder injection positions (PIP) at the moment of spark detonation, and two numbers of GDS shots with 6.66 Hz frequency were applied as variable parameters in the GDS process. Surface profile measurements were conducted by contact profilometry with the use of the TOPO-01 system and the Mitutoyo SJ 210 profilometer. The measured parameters were used to analyze surface topography in two-dimensional (2D) and three-dimensional (3D) systems. It was assumed that roughness can be regarded as a non-stationary parameter of variance in surface amplitude which is highly dependent on the sampling rate and spraying distance. Therefore, changes in surface amplitude parameters and functional properties were analyzed across segments with a length (ln) of 1.25, 4 and 12.5 mm. The development of the geometric structure of the surface was analyzed with the RMS (Root Mean Square) fractal method, and the geometric structure of the surface stretched by several orders of magnitude was evaluated based on the correlation between roughness (Rq), segment length (ln) and fractal dimension (D). The RMS method and the calculated fractal dimension (D) supported the characterization of the geometric structure of intermetallic Fe-Al protective coatings subjected to GDS under the specified process conditions based on the roughness profiles of surface segments with a different length (ln).

Źródło:

Technical Sciences / University of Warmia and Mazury in Olsztyn; 2019, 22(3); 249-262
1505-4675
2083-4527

Pojawia się w:

Technical Sciences / University of Warmia and Mazury in Olsztyn

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Siarczki w pokładach węgla kamiennego warstw orzeskich s.s. serii mułowcowej (westfal B) we wschodniej części GZW
Sulphides in hard coal seams from the Orzesze Beds s.s. of Mudstone Series (Westphalian B) in the eastern part of the Upper Silesian Coal Basin

Autorzy:

Bielowicz, B.
Misiak, J.

Powiązania:

https://bibliotekanauki.pl/articles/216060.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN

Tematy:

węgiel kamienny
petrografia
siarczek żelaza
analiza WDS
hard coal
petrography
Fe sulfide
WDS analysis

Opis:

Z uwagi na dynamiczne zmiany klimatyczne, które częściowo spowodowane są użytkowaniem węgla, ważne jest badanie zawartości substancji szkodliwych. Niebezpieczne zanieczyszczenia powietrza, powstające podczas spalania węgla (np, As, Se, Hg, Pb, Sb), są często związane z minerałami siarczkowymi w węglu. Przedmiotem badań były siarczki, które występują w polskim węglu kamiennym. Siarczki są jedną z form występowania siarki w węglu. Przeprowadzona praca skupiła się głównie na charakterystyce form występowania siarczków w skali makroskopowej i mikroskopowej, a także analizie chemicznej w mikroobszarze. Badania były prowadzone dla pokładów 301–308 ze wschodniej części Górnośląskiego Zagłębia Węglowego, stratygraficznie zaliczanych do najwyższej części warstw orzeskich s.s. (westfal B). Zostały opróbowane pokłady węgla w wyrobiskach podziemnych kopalń Jan Kanty, Sobieski Jaworzno III , Wesoła i Ziemowit. [...]
Due to dynamic climatic changes resulting, among others, from the use of coal, the content of harmful substances in coal is of particular importance. Dangerous air pollution resulting from the burning of coal (e.g. As, Se, Hg, Pb, Sb) is often associated with sulfide minerals in coal. The study focused on the sulphides occurring in Polish hard coal deposits. Sulfides are one of the forms of occurrence of sulfur in coal. In this paper, an emphasis has been placed on the characteristics of forms of occurrence of sulphides on both macroscopic and microscopic scale and on the chemical analysis in the micro area. The study has been conducted for the No. 301–308 seams from the eastern part of the Upper Silesian Coal Basin, stratigraphically belonging to the highest part of the Orzesze Beds s.s. (Westphalian B). The coal samples have been collected from the coal seams in the underground excavations of the following coal mines: Jan Kanty, Sobieski Jaworzno III , Wesoła and Ziemowit hard coal mine. [...]

Źródło:

Gospodarka Surowcami Mineralnymi; 2016, 32, 3; 23-38
0860-0953

Pojawia się w:

Gospodarka Surowcami Mineralnymi

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Thermal analysis of aluminum bronze BA1032

Autorzy:

Chrostek, T.

Powiązania:

https://bibliotekanauki.pl/articles/298011.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Tematy:

thermal analysis
DSC
differential scanning calorimetry
BA1032
CuAl10Fe3Mn2

Opis:

In this study, aluminum bronze BA1032 was analyzed thermally by differential scanning calorimetry (DSC). The article presents the results of measurements of phase transitions occurring in aluminum bronze at a temperature of up to 600°C. Thermal analyses were conducted at constant heating rates of 5°C/min, 10°C/min and 15°C/min.

Źródło:

Technical Sciences / University of Warmia and Mazury in Olsztyn; 2016, 19(4); 359-366
1505-4675
2083-4527

Pojawia się w:

Technical Sciences / University of Warmia and Mazury in Olsztyn

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Model of Cu-Al-Fe-Ni bronze crystallization

Autorzy:

Pisarek, B. P.

Powiązania:

https://bibliotekanauki.pl/articles/383278.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

theoretical basis
foundry proces
thermal analysis
derivative analysis
microstructure
Cu-Al-Fe-Ni bronze
model of crystallization
podstawy teoretyczne
proces odlewniczy
analiza termiczna
analiza derywacyjna
mikrostruktura
brąz Cu-Al-Fe-Ni
model krystalizacji

Opis:

According to the analysis of the current state of the knowledge shows that there is little information on the process of phase transformations that occur during the cooling Cu-Al-Fe-Ni hypo-eutectoid bronzes with additions of Cr, Mo and/or W, made additions individually or together, for the determination of: the type of crystallizing phases, crystallizing phases, order and place of their nucleation. On the basis of recorded using thermal and derivative analysis of thermal effects phases crystallization or their systems, analysis of the microstructure formed during crystallization - observed on the metallographic specimen casting ATD10-PŁ probe, analysis of the existing phase equilibrium diagrams forming elements tested Cu-Al-Fe-Ni bronze, with additions of Cr, Mo, W and/or Si developed an original model of crystallization and phase transformation in the solid state, the casting of high quality Cu-Al-Fe-Ni bronze comprising: crystallizing type phase, crystallizing phase sequence, place of nucleation.

Źródło:

Archives of Foundry Engineering; 2013, 13, 3; 72-79
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Quality of automotive sand casting with different wall thickness from progressive secondary alloy

Autorzy:

Pastierovičová, Lucia
Kuchariková, Lenka
Tillová, Eva
Chalupová, Mária
Pastirčák, Richard

Powiązania:

https://bibliotekanauki.pl/articles/26078793.pdf

Data publikacji:

2022

Wydawca:

Stowarzyszenie Menedżerów Jakości i Produkcji

Tematy:

jakość odlewów
wtórny stop aluminium
grubość ściany
analiza ilościowa
wyższa zawartość Fe
quality of castings
secondary aluminium alloy
wall thickness
quantitative analysis
higher Fe content

Opis:

This paperwork is focused on the quality of AlSi6Cu4 casting with different wall thicknesses cast into the metal mold. Investigated are structural changes (the morphology, size, and distribution of structural components). The quantitative analysis is used to numerically evaluate the size and area fraction of structural parameters (α-phase, eutectic Si, intermetallic phases) between delivered experimental material and cast with different wall thicknesses. Additionally, the Brinell hardness is performed to obtain the mechanical property benefits of the thin-walled alloys. This research leads to the conclusion, that the AlSi6Cu4 alloy from metal mold has finer structural components, especially in small wall thicknesses, and thus has better mechanical properties (Brinell hardness). These secondary Al-castings have a high potential for use in the automotive industry, due to the thin thicknesses and thus lightweight of the construction.

Źródło:

Production Engineering Archives; 2022, 28, 2; 172--177
2353-5156
2353-7779

Pojawia się w:

Production Engineering Archives

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Finite element model for analysis of characteristics of shrouded rotor blade vibrations
Model elementów skończonych do analizy charakterystyk drgań łopat wirnika osłoniętego

Autorzy:

Zinkovskii, Anatoliy
Savchenko, Kyrylo
Onyshchenko, Yevheniia
Polishchuk, Leonid
Nazerke, Abilkaiyr
Zhumazhanov, Bagashar

Powiązania:

https://bibliotekanauki.pl/articles/2174719.pdf

Data publikacji:

2022

Wydawca:

Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej

Tematy:

FE modeling
modal analysis
forced vibration analysis
shrouded blade
nonlinear vibrations
modelowanie MES
analiza modalna
analiza drgań wymuszonych
łopata osłonięta
drgania nieliniowe

Opis:

The paper presents the approaches to FE modelling of blade airfoil, contact between the shrouds and operational damage. The regularities are established concerning the influence of the finite element type, finite element mesh and model of contact interaction on the spectrum of natural frequencies of blade assemblies. The use of the developed computational models is substantiated to determine the forced vibration characteristics of the selected objects of investigation. Based on the performed numerical experiments it was substantiated of finite element model selection for analysis of characteristics of shrouded rotor blade vibrations.
W artykule przedstawiono podejścia do modelowania elementów skończonych płata łopaty, styku osłon oraz uszkodzeń eksploatacyjnych. Ustalono prawidłowości dotyczące wpływu typu elementu skończonego, siatki elementów skończonych oraz modelu interakcji stykowej na widmo częstotliwości drgań własnych zespołów łopatek. Uzasadnione jest wykorzystanie opracowanych modeli obliczeniowych do wyznaczania charakterystyk drgań wymuszonych wybranych obiektów badań. Na podstawie przeprowadzonych eksperymentów numerycznych uzasadniono wybór modelu elementów skończonych do analizy charakterystyk drgań osłoniętych łopat wirnika.

Źródło:

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2022, 12, 4; 11--16
2083-0157
2391-6761

Pojawia się w:

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 45.

Tytuł:

On the reconstruction method of ceramic foam structures and the methodology of Young modulus determination
Metoda rekonstrukcji struktur geometrycznych pianek ceramicznych oraz metodologia określania modułu Younga

Autorzy:

Nowak, M.
Nowak, Z.
Pęcherski, R. B.
Potoczek, M.
Śliwa, R. E.

Powiązania:

https://bibliotekanauki.pl/articles/354449.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

foams
3D image analysis
cellular ceramics
FE modeling
porous alumina
mechanical properties
pianki ceramiczne
analiza obrazu 3D
pianki porowate
modelowanie FE
porowaty tlenek glinu
właściwości mechaniczne

Opis:

In the present paper a finite element model was used to investigate the mechanical properties such as Young’s modulus of open-cell ceramic foam. Finite element discretization was derived from real foam specimen by computer tomography images. The generated 3D geometry of the ceramic foam was used to simulate deformation process under compression. The own numerical procedure was developed to control finite element mesh density by changing the element size. Several numerical simulations of compression test have been carried out using commercial finite element code ABAQUS. The size of the ceramic specimen and the density of finite element mesh were examined. The influence of type and size of finite element on the value of Young’s modulus was studied, as well. The obtained numerical results have been compared with the results of experimental investigations carried out by Ortega [11]. It is shown that numerical results are in close agreement with experiment. It appears also that the dependency of Young’s modulus of ceramic foam on density of finite element mesh cannot be ignored.
W pracy przedstawiono metodę określania własności mechanicznych np. modułu Younga porowatych pianek ceramicznych o otwartych komórkach. Wykorzystując obrazy z tomografii komputerowej rzeczywistej struktury pianki otrzymano siatkę elementów skończonych. Przestrzenny obraz geometrii pianki wykorzystano do symulacji numerycznej procesu deformacji w próbie ściskania. Opracowano własną procedurę numeryczną do generowania elementów skończonych o różnej wielkości i kontroli gęstości siatki elementów. Przeprowadzono szereg symulacji numerycznych procesu ściskania pianek z wykorzystaniem programu elementów skończonych ABAQUS. Ustalono wpływ rodzaju i wielkości elementów skończonych jak również wielkości samej próbki na wartość modułu Younga wyliczonego dla próby jednoosiowego ściskania. Otrzymane numerycznie wartości modułów Younga porównano z wartościami z doświadczeń opublikowanych w pracy Ortegi [11]. Otrzymane rezultaty z symulacji numerycznych są w dobrej zgodności z doświadczeniem. Ustalono, ze wartości modułu Younga dla porowatych pianek ceramicznych zależy od gęstości siatki elementów skończonych i nie może być pomijana.

Źródło:

Archives of Metallurgy and Materials; 2013, 58, 4; 1219-1222
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Modification of the Surface of the Iron Powder as an Ingredient of the High Calorific Mixture

Autorzy:

Czajka, B.
Wachowski, L.
Łapiński, A.
Rzodkiewicz, W.

Powiązania:

https://bibliotekanauki.pl/articles/358561.pdf

Data publikacji:

2008

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

iron powder
Fe-KClO4 mixture
Raman spectroscopy (RS)
ellipsometry
thermo-programmed reduction (TPR)
thermogravimetric analysis
TG/DTA

Opis:

Textural properties of iron powders obtained by reduction of iron(II) compounds and by electrolysis were determined. Their specific surfaces were 0.38 and 0.43 m2g-1 respectively, and the prevailing grain sizes amounted to 10 and 43 ?m respectively. Total content of the determined metallic impurities was 0.055 wt.% in the preparation obtained by the electrolysis while in the preparation obtained by reduction it was 0.025 wt.%. It was proved that in initial samples the α-Fe2O3 phase occurred in the outer oxide layer present on the surface of Fe grains, and below this phase a layer of magnetite was found, the thickness of which was considerably greater in iron obtained by electrolysis. Measurements of selected properties showed that modification of the iron powder surface carried out by reduction with dihydrogen led to decreasing the linear rate of burning of the high calorific mixture Fe/KClO4 but it did not affect its calorific value. Moreover, it was found that modification of the iron powder surface resulted in lowering the temperature of ignition of the analysed mixture and decreasing the quantity of the released oxygen generated by decomposition of the oxidant, which did not react with the iron powder.

Źródło:

Central European Journal of Energetic Materials; 2008, 5, 3-4; 87-102
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Vertical vibrations of composite bridge/track structure/high-speed train systems. Part 1: Series-of-types of steel-concrete bridges

Autorzy:

Podworna, M.
Klasztorny, M.

Powiązania:

https://bibliotekanauki.pl/articles/202151.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

composite steel-concrete bridge
ballasted track structure
high-speed train
design
FE modelling
simulation
forced resonances
numerical analysis

Opis:

A new series-of-types of single-span simply-supported railway composite (steel-concrete) bridges, with a symmetric platform, has been designed according to the Polish bridge standards. The designed bridges/viaducts are located on the main railways of the classification coefficient k = +2. A ballasted track structure adapted to high operating speeds has also been designed. The ultimate limit states and the limit states corresponding to the bridges undertaken are collected and discussed. The bridges have been designed in accordance with contemporary art engineering, with geometric and material optimization, avoiding overdesign. A new methodology of numerical modelling and simulation of dynamic processes in composite bridge/ballasted track structure/high speed train systems, developed in Part 2 and Part 3, has been applied and implemented in a problem-oriented computer programme. A new approach to predicting forced resonances in those systems is formulated and tested numerically. It has been proved that in the case of typical structural solutions of bridges and ballasted track structures, it is necessary to introduce certain limitations for operating speeds of trains.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 1; 165-179
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 48.

Tytuł:

Determining the optimal solution treatment temperature of aluminum cast alloys by using quantitative analysis

Autorzy:

Kucharikova, L.
Tillova, E.

Powiązania:

https://bibliotekanauki.pl/articles/109049.pdf

Data publikacji:

2017

Wydawca:

Stowarzyszenie Menedżerów Jakości i Produkcji

Tematy:

aluminum cast alloys
quantitative analysis
microstructural features
eutectic Si
Fe-rich phases
Cu-rich phases
stopy aluminium
odlewnicze stopy aluminium
cechy mikrostrukturalne
analiza ilościowa

Opis:

Heat treatment of aluminum casts is necessary for achieving the desired properties of casts. Heat treatment caused changes in microstructure and substructure of materials and therefore it is necessary to control which changes are sufficient and which are insufficient. Morphology (shape, size and distribution) of microstructural features influence the properties of cast rapidly. Contribution describes influence of the heat treatment marking T4 - solution treatment in dependence on temperature (505, 515 a 525 °C) and holding time (2, 4, 8, 16 a 32 hour) on structure (α–phase, eutectic silicon, intermetallic phases) and mechanical properties (ultimate tensile strength - UTS and Brinell hardness - HBW) of A226 cast alloy. This cast alloy is made out of secondary aluminum. Secondary aluminum alloys are made of aluminum scrap. About 70 % of such material are used in the manufacture of casts. Therefore the strictly microstructure control of experimental material before and after heat treatment is necessary for declaration of cast properties. Nowadays manufacturers use the methods of quantitative analysis for quick control of microstructural features. This work present some of them.

Źródło:

Archiwum Wiedzy Inżynierskiej; 2017, 2, 2; 27-30
2544-2449

Pojawia się w:

Archiwum Wiedzy Inżynierskiej

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

FE numerical tests of railway wagon for intermodal transport according to PN-EU standards

Autorzy:

Krason, W.
Niezgoda, T.

Powiązania:

https://bibliotekanauki.pl/articles/202087.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

prototype railway wagon for intermodal transport
FE methodology of numerical tests
analysis of the wagon strength and dynamics simulations according to PN-EU standards
prototyp wagonu kolejowego transportu intermodalnego
FE
metodologia testów numerycznych
analiza wytrzymałości wagonu
symulacja dynamiki wagonu
normy PN-EN

Opis:

A special wagon, presented in the paper, can be used for intermodal transport of various types of vehicles. It enables transport of vehicles of 36 tons mass and height of 4m on the GB1 clearance height. An innovative wagon is equipped with a frame-support with marginal parts mounted on standard biaxial bogies and the central part lowered with a rotatable loading platform. The rotating part of wagon acts as a kind of platform, allowing truck to move through it during load/unload. During railway operation, this rotating platform is to become an integrated part of the wagon; the tailboards of the rotating part will be connected to the over-bogie part with the special locks. A unique concept of the wagon structure forced a design approach which was rather unusual for the rail industry. Since the design team aimed at very challenging demands of GB1 envelope and usage of standard bogies, the layout of the wagon had to be thoroughly examined in terms of its overall stiffness. Every major design change had to be simulated in order to accurately predict its influence on the whole wagon structure. FE analysis was used for numerical tests of such a wagon structure in different configurations. The calculations were carried out on the basis of PN-EN standards. Selected results of numerical tests of the prototype version of a such wagon for intermodal transports were presented in the paper.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 4; 843-851
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 50.

Tytuł:

Rozkład przestrzenny związków żelaza i manganu w osadach dennych Jeziora Goczałkowickiego
Spatial distribution of iron and manganese compounds in bottom sediments of the Goczalkowice Dam Reservoir

Autorzy:

Czaplicka, A.
Ślusarczyk, Z.
Bazan, S.
Szarek-Gwiazda, E.

Powiązania:

https://bibliotekanauki.pl/articles/237886.pdf

Data publikacji:

2017

Wydawca:

Polskie Zrzeszenie Inżynierów i Techników Sanitarnych

Tematy:

Goczalkowice dam reservoir
bottom sediments
Fe and Mn compounds
spatial distribution
correlations
cluster analysis
Jezioro Goczałkowickie
osady denne
związki żelaza
związki manganu
rozkład przestrzenny
korelacje
analiza skupień

Opis:

Analysis of the bottom sediment composition in the shallow, polimictic Goczalkowice dam reservoir demonstrated that the amounts of Mn and Fe compounds determined did to a small extent only exceed the level of their geochemical background. Spatial distribution of iron and manganese content in the Goczalkowice dam reservoir was developed on the basis of the bottom sediment composition studies for the reservoir. There is an evidence of both natural and anthropogenic origin of the two elements. Correlations between their presence and the content of granulometric bottom sediment fractions, organic matter amount, depth of the measuring points as well as concentration of other trace elements (Cd, Cu, Ni, Pb, Zn) in the sediments were developed. Statistical testing allowed for identification of varying statistical strength between the content of Fe and Mn and fi ne bottom sediment fractions. Three groups of measuring points identified in the dam reservoir substantially differed from each other by Fe and Mn bottom sediment content. In addition, differentiation in their concentration along longitudinal transects of the dam reservoir was demonstrated.
Przeprowadzone badania składu osadów dennych w płytkim, polimiktycznym Jeziorze Goczałkowickim wykazały, że oznaczone ilości związków żelaza i manganu tylko w niewielkim stopniu przekraczały poziom ich tła geochemicznego. Na podstawie badań składu osadów dennych Jeziora Goczałkowickiego opracowano rozkład przestrzenny zawartości związków żelaza i manganu w czaszy zbiornika. Stwierdzono zarówno naturalne, jak i antropogeniczne pochodzenie obu tych pierwiastków. Opracowano współzależności między ich obecnością a zawartością frakcji granulometrycznych osadów, ilością związków organicznych, głębokością punktów pomiarowych, a także zawartością innych metali śladowych (Cd, Cu, Ni, Pb, Zn) w osadach. Za pomocą testów statystycznych wskazano na różną siłę statystyczną współzależności między zawartością żelaza i manganu a zawartością drobnych frakcji osadów dennych. Wydzielono trzy grupy punktów pomiarowych w zbiorniku zaporowym, istotnie różniących się między sobą zawartością związków żelaza i manganu w osadach dennych. Wykazano także zróżnicowanie zawartości tych metali w osadach wzdłuż podłużnych transektów zbiornika zaporowego.

Źródło:

Ochrona Środowiska; 2017, 39, 3; 47-54
1230-6169

Pojawia się w:

Ochrona Środowiska

Dostawca treści:

Biblioteka Nauki

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