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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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
Tytuł:
Wielowariantowa analiza numeryczna podwozia specjalnej platformy kolejowej
Multiset numerical analysis of a special railway platform frame-carriage
Autorzy:
Chłus, K.
Krasoń, W.
Powiązania:
https://bibliotekanauki.pl/articles/209578.pdf
Data publikacji:
2012
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
wagon kolejowy ACTS
modele MES ramy-ostoi z platformami obrotowymi
ACTS railway wagon
FE models of the frame-carriage with rotatable platforms
numerical analysis
experimental measurements of the frame-carriage structure
Opis:
Celem pracy jest opracowanie metodyki badań oraz modeli numerycznych MES ramy ostoi i obrotowych platform ładunkowych wagonu do analizy sztywności konstrukcji z odwzorowaniem różnych zamocowań na wózkach jezdnych, wykonanie badań numerycznych oraz porównanie wyników obliczeń z wynikami eksperymentalnymi pomiaru strzałki ugięcia rzeczywistej platformy wagonu kolejowego. Badany wagon przeznaczony jest do transportu pojemników wymiennych w systemie ACTS [1] (Abroll Container Transport System, czyli odsuwany, kontenerowy system transportowy). Istotą takiego przeładunku jest umieszczenie pojemnika na specjalnej platformie obrotowej umożliwiającej poziome przesunięcie ładunku na ciężarówkę. Analizę wytrzymałościową konstrukcji ramy takiego wagonu wykonano metodą elementów skończonych MES [3, 4]. Model 3D badanej platformy zbudowano z powłokowych i belkowych elementów skończonych. Dyskretny model MES wykonano za pomocą preprocesora MSC Patran [5], a do obliczeń użyto programu MSC Nastran [6]. Rozważano trzy warianty modeli MES ramy wagonu, które różnią się sposobem odwzorowania konstrukcji rzeczywistej oraz jej zamocowania na wózkach jezdnych za pomocą czopa skrętnego. W pracy wykazano wpływ sposobu modelowania, poziomu dokładności odzwierciedlenia w modelach MES szczegółów konstrukcyjnych węzła zamocowania na poprawność odwzorowania sztywności badanej konstrukcji wagonu z platformami obrotowymi. Ugięcia układu konstrukcyjnego rama-platformy obrotowe wagonu w zakresie maksymalnych dopuszczalnych obciążeń eksploatacyjnych zweryfikowano za pomocą wyników eksperymentalnych pomiaru strzałki ugięcia rzeczywistej platformy wagonu kolejowego.
The paper presents the selected elements of the research methodology of the frame-carriage loading platforms system for specific transports. There was discussed the structure of numerical FE models of the system and selected results of static analysis. The examined railway wagon was designed to transport interchangeable containers in ACTS (Abroll Container Transport System). The essential matter of such reloading is placing the container on a special rotating platform which enables horizontal reloading of the load onto the truck. In order to perform strength numerical analyses with a finite element method (FEM), a 3D shell-beam model of the wagon was prepared. The discreet FEM model was developed with the aid of MSC Patran preprocesor and MSC Nastran program was applied for numerical analysis. The models were verified with the use of results of an experimental measurement of the decline of the real rail carriage platform. The obtained value of the frame deflection from the numerical simulation of the static test corresponds to an experimental value. On the basis of the presented here numerical results, it can be concluded that the developed model is correct and can be used to further strength research.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2012, 61, 3; 61-81
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
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 (Sal) and the degree of anisotropy (Str) 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
Artykuł
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
Artykuł
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