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Wyszukujesz frazę "metoda elementów skończonych" wg kryterium: Temat


Tytuł:
Finite element analysis of temperature distribution in axisymmetric model of disc brake
Autorzy:
Grześ, P.
Powiązania:
https://bibliotekanauki.pl/articles/386492.pdf
Data publikacji:
2010
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
metoda elementów skończonych
MES (metoda elementów skończonych)
rozkład temperatury
hamowanie
finite element method
FEM
temperature distribution
braking
Opis:
A transient thermal analysis is developed to examine temperature expansion in the disc and pad volume under simulated operation conditions of single braking process. This complex problem of frictional heating has been studied using finite element method (FEM). The Galerkin algorithm was used to discretize the parabolic heat transfer equation for the disc and pad. FE model of disc/pad system heating with respect to constant thermo-physical properties of materials and coefficient of friction was performed. The frictional heating phenomena with special reference to contact conditions was investigated. An axisymmetric model was used due to the proportional relation between the intensity of heat flux perpendicular to the contact surfaces and the rate of heat transfer. The time related temperature distributions in axial and radial directions are pre- sented. Evolution of the angular velocity and the contact pressure during braking was assumed to be nonlinear. Presented transient finite element analysis facilitates to determine temperature expansion in special conditions of thermal contact in axisymmetric model.
Źródło:
Acta Mechanica et Automatica; 2010, 4, 4; 23-28
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Damage accumulation in stress concentration zones of parts with hardened surface under low cycle tension-compression and bending
Autorzy:
Daunys, M.
Sabaliauskas, A.
Powiązania:
https://bibliotekanauki.pl/articles/386596.pdf
Data publikacji:
2007
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
trwałość
uszkodzenie
metoda elementów skończonych
durability
damage
finite element method
Opis:
This paper provides experimental and analytical evaluation of durability of nonhardened and hardened by EMT specimens of grade 45 steel with stress concentrators, under low cycle tension-compression and pure bending. For both type of loading modes was carried out durability analysis, taking into account fatigue and quasi-static damage depending on loading level and number of s. Stress and strain concentration coefficients were calculated by analytical and finite element methods (FEM) under elastic plastic cyclic loading. Performed analytical investigation showed, that suggested method for quasi-static and fatigue damage summation, when accumulated plastic strain and the width of the hysteresis loop are taken into account, provides a very good agreement with the experimental results at stress concentration zones of surface-hardened pans under tension-compression and bending.
Źródło:
Acta Mechanica et Automatica; 2007, 1, 1; 23-26
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Modelling and Experimental Verification of Glass-Polyester Mixed Laminate Beam Bending Test
Autorzy:
Bondyra, A.
Klasztorny, M.
Szurgott, P.
Gotowicki, P.
Powiązania:
https://bibliotekanauki.pl/articles/387011.pdf
Data publikacji:
2012
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
zginanie belek
analiza numeryczna
MES (metoda elementów skończonych)
metoda elementów skończonych
weryfikacja doświadczalna
GRRP shells
beam bending test
FEM numerical modelling
experimental verification
Opis:
The subject undertaken in the study is a glass (fibre) – polyester (matrix) layered composite, of the mixed sequence, composed alternately of laminas reinforced with E-glass plain weave fabric (WR600) and E-glass mat (CSM450). The laminate is manufactured on Polimal 104 polyester matrix. The aim of the study is to determine the options/values of parameters for numerical modelling and simulation of static processes in shell structures made of glass-polyester composites undertaken, in MSC.Marc system, recommended in engineering calculations. The effective elastic and strength constants of homogeneous laminas have been determined experimentally according to the standard procedures. The bending test of composite beams has been conducted experimentally and simulated numerically. Numerical investigations have been focused on selection of options/values of the numerical modelling and simulation parameters. The experimental verification of numerical modelling of the bending test is positive in both the quasi-linear range and in the catastrophic – progressive failure zone.
Źródło:
Acta Mechanica et Automatica; 2012, 6, 3; 1-18
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3D apple modeling with the use of the structured light method
Autorzy:
Hryniewicz, M.
Anthonis, J.
Ramon, H.
Powiązania:
https://bibliotekanauki.pl/articles/386285.pdf
Data publikacji:
2008
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
modelowanie 3D
metoda elementów skończonych
3D modeling
finite element method
Opis:
The geometrical fruit model could affect many physical phenomena, such as heat, mass and moisture transfer, pneumatic transport and mechanical vibrations which occur during handling and processing fruits (Jancsok, 1999). The fruit geometrical model could be further studied by the Finite Element Method (FEM) (Jancsok, 1999). Incidence of bruises is the most important type of postharvest mechanical injury (van Zeebroeck, 2005). The reason for this is that the causes and mechanisms of impact and vibration are complex and interrelated (van Zeebroeck, 2005). In mechanical engineering a geometrical model of the structure to be analyzed is usually available as CAD drawing which can be imported directly in FE software (Jancsok, 1999). However, for agricultural-, bio- and food- materials there are no geometrical models available so they have to be defined manually, which is complicated by the complex shape and the shape variability of these products (Jancsok, 1999). Dintwa (Dintwa, 2006) stated that the 3D simplified models used in the dynamic experiments were not accurate enough, most certainly because of the coarse discretization used with these models. This paper describes a system for complex shapes geometrical modeling. The system was implemented in real apple modeling. It was developed on structured light method elaborated by Sitnik (2002). The method has advantages and disadvantages. Advantages: modeling of complex shapes, recalculation of many points at one moment, at least only 3 views for one figure, measurements without object touching. Disadvantages: problems with light reflection.
Źródło:
Acta Mechanica et Automatica; 2008, 2, 3; 36-41
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Convective Cooling of a Disc Brake During Single Braking
Autorzy:
Adamowicz, A.
Grześ, P.
Powiązania:
https://bibliotekanauki.pl/articles/387158.pdf
Data publikacji:
2012
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
hamowanie
metoda elementów skończonych
braking
pad/disc system
finite element method
convective cooling
Opis:
This study is primarily focused on the investigation of an impact of heat transfer coefficient on heat dissipation from the solid disc using the finite element method (FEM). The analysis was carried out within four individual cases of braking of the passenger vehicle simulating mountain descent with different velocities and the following release periods, where the convective terms of cooling were dependent on the angular velocity of the disc. For the purpose of confronting contrasting conditions of the braking action, apart from heating region, the whole surface of the disc was insulated. The process was performed under the operation conditions of a real front disc brake, whose dimensions and thermophysical properties of materials were adopted and applied to the FE model. It was concluded that the influence of cooling of the exposed surfaces of the disc during relatively short braking is insignificant. However the period after brake release results in considerable decrease in temperature of the disc.
Źródło:
Acta Mechanica et Automatica; 2012, 6, 2; 5-10
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stress concentration resulting from irregular shape of explosively cladded materials connections – FEM simulation
Autorzy:
Kurek, A.
Niesłony, A.
Kurek, M.
Powiązania:
https://bibliotekanauki.pl/articles/387039.pdf
Data publikacji:
2014
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
FEM
finite element method
explosive cladding
interference zone
metoda elementów skończonych
zgrzewanie wybuchowe
Opis:
The paper contains a numerical analysis of interface zone steel-titanium bimetal obtained by explosive cladding method. Due to the waviness of the zone, and various properties of the constituent material of the materials type contain structural notch. Therefore it is important inter alia in terms of presentation of the results of fatigue are the maximum stresses that occur just in the area of the zone. In the paper the stress concentration factor and the proposed method of modelling the joint zone of a sinusoidal profile, characterized by the same coefficient of stress concentration at the actual profile.
Źródło:
Acta Mechanica et Automatica; 2014, 8, 2; 103-106
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of a SPH coupled FEM method for simulation of trimming of aluminum autobody sheet
Autorzy:
Bohdal, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/387043.pdf
Data publikacji:
2016
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
trimming
smoothed particle hydrodynamics
digital image correlation
SPH
metoda elementów skończonych
blacha aluminiowa
przycinanie
Opis:
In this paper, the applications of mesh-free SPH (Smoothed Particle Hydrodynamics) continuum method to the simulation and analysis of trimming process is presented. In dealing with shearing simulations for example of blanking, piercing or slitting, existing literatures apply finite element method (FEM) to analysis of this processes. Presented in this work approach and its application to trimming of aluminum autobody sheet allows for a complex analysis of physical phenomena occurring during the process without significant deterioration in the quality of the finite element mesh during large deformation. This allows for accurate representation of the loss of cohesion of the material under the influence of cutting tools. An analysis of state of stress, strain and fracture mechanisms of the material is presented. In experimental studies, an advanced vision-based technology based on digital image correlation (DIC) for monitoring the cutting process is used.
Źródło:
Acta Mechanica et Automatica; 2016, 10, 1; 56-61
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The study of stab resistance of dry aramid fabrics
Autorzy:
Barnat, W.
Sokołowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/387632.pdf
Data publikacji:
2014
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
numerical model
dry fabric
FEM
aramid fabric
composite
model numeryczny
metoda elementów skończonych
kompozyt
Opis:
The paper presents the issue of a knife proof ballistic package. This issue was emphasized since most of modern vests are de-signed to match the threat posed to them only by firearms. There was observed negligence of protection against melee attacks. There is, thus, a need to develop a research methodology in this matter, because it is a valid and necessary problem in a modern developed so-ciety. The aim of this study was to perform a numerical model which simulated the phenomenon of penetration of a ballistic package by an engineering blade. Specification of an engineering blade was taken from standard NIJ Standard-0115.00. Commercial software LS-DYNA was used to carry out the analysis.
Źródło:
Acta Mechanica et Automatica; 2014, 8, 1; 53-58
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of temperature field in a disc brake at different cover angle of the pad
Autorzy:
Grześ, P.
Powiązania:
https://bibliotekanauki.pl/articles/386929.pdf
Data publikacji:
2014
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
temperature
disc brake
cover angle of the pad
finite element method
temperatura
hamulec tarczowy
metoda elementów skończonych
Opis:
In the paper an influence of the cover angle of the pad on temperature fields of the components of the disc brake is studied. A three-dimensional finite element (FE) model of the pad-disc system was developed at the condition of equal temperatures on the contacting surfaces. Calculations were carried out for a single braking process at constant deceleration assuming that the contact pressure corresponds with the cover angle of the pad so that the moment of friction is equal in each case analysed. Evolutions and distributions of temperature both for the contact surface of the pad and the disc were computed and shown.
Źródło:
Acta Mechanica et Automatica; 2014, 8, 4; 185-188
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite element analysis of thermal stresses in a pad-disc brake system (a review)
Autorzy:
Adamowicz, A.
Grześ, P.
Powiązania:
https://bibliotekanauki.pl/articles/387075.pdf
Data publikacji:
2013
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
hamulce tarczowe
temperatura
naprężenia termiczne
metoda elementów skończonych
pad-disc brake system
temperature
thermal stresses
finite element method
Opis:
Rapid temperature change in components of the sliding systems induces thermal stresses due to thermal expansion. This effect is particularly evident in disc brakes working under high thermal loads. This paper deals with the finite element modelling of frictional heating process in disc brakes and clutches to study the temperature and stress distributions during operation.
Źródło:
Acta Mechanica et Automatica; 2013, 7, 4; 191-195
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study of the preload force in metal-elastomer torsion springs
Autorzy:
Sikora, W.
Michalczyk, K.
Machniewicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/386440.pdf
Data publikacji:
2016
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
hyperelastic materials
neidhart spring
metal-elastomer spring
FEM
finite element method
materiał hiperelastyczny
elastomer
metoda elementów skończonych
MES
Opis:
Neidhart type suspension units composed of metal-elastomer torsion springs can be a good alternative to steel helical springs in applications such as vibration absorbers or vehicle suspension systems. Assembling this type of spring requires initial preload of the elastomeric working elements, which determines their operating properties.The results of experimental tests and numerical simulations concerning the preload of elastomeric working elements in Neidhart type suspension units are presented in the paper. The performed research made it possible to propose a new calculation model for determining the preload force value acting on the elastomeric cylindrical elements applied in this type of suspension unit. The results obtained using the proposed model exhibit good convergence with FEM simulation results within the range of the tested geometrical and material properties.
Źródło:
Acta Mechanica et Automatica; 2016, 10, 4; 300-305
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coupled static and dynamic buckling modelling of thin-walled structures in elastic range review of selected problems
Autorzy:
Kołakowski, Z.
Teter, A.
Powiązania:
https://bibliotekanauki.pl/articles/387475.pdf
Data publikacji:
2016
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
interaction
buckling
thin-walled structures
FEM
analytical-numerical method
review
odkształcenia
konstrukcje cienkościenne
metoda analityczno-numeryczna
metoda elementów skończonych
MES
Opis:
A review of papers that investigate the static and dynamic coupled buckling and post-buckling behaviour of thin-walled structures is carried out. The problem of static coupled buckling is sufficiently well-recognized. The analysis of dynamic interactive buckling is limited in practice to columns, single plates and shells. The applications of finite element method (FEM) or/and analytical-numerical method (ANM) to solve interaction buckling problems are on-going. In Poland, the team of scientists from the Department of Strength of Materials, Lodz University of Technology and co-workers developed the analytical-numerical method. This method allows to determine static buckling stresses, natural frequencies, coefficients of the equation describing the post-buckling equilibrium path and dynamic response of the plate structure subjected to compression load and/or bending moment. Using the dynamic buckling criteria, it is possible to determine the dynamic critical load. They presented a lot of interesting results for problems of the static and dynamic coupled buckling of thin-walled plate structures with complex shapes of cross-sections, including an interaction of component plates. The most important advantage of presented analytical-numerical method is that it enables to describe all buckling modes and the post-buckling behaviours of thin-walled columns made of different materials. Thin isotropic, orthotropic or laminate structures were considered.
Źródło:
Acta Mechanica et Automatica; 2016, 10, 2; 141-149
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Analysis of IED Detonation Effect on Steel Plate
Autorzy:
Barnat, W.
Panowicz, R.
Niezgoda, T.
Dybcio, P.
Powiązania:
https://bibliotekanauki.pl/articles/387041.pdf
Data publikacji:
2012
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
fala uderzeniowa
improwizowane ładunki wybuchowe
MES (metoda elementów skończonych)
blast wave
IED
improvised explosive device
FEM
finite element method
Opis:
The article presents the results of initial works on protection of vehicles crews against improvised explosive mechanisms (charges) IED. The presented coupled problem of explosion and interaction of pressure impulse coming from detonation was described in available standard documents. The presented results are the introduction to works oncomposed protective layers applied in vehicles.
Źródło:
Acta Mechanica et Automatica; 2012, 6, 1; 10-12
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical and Experimental Comparison of Combined Multilayer Protective Panels
Autorzy:
Barnat, W.
Panowicz, R.
Niezgoda, T.
Powiązania:
https://bibliotekanauki.pl/articles/387055.pdf
Data publikacji:
2012
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
MES (metoda elementów skończonych)
fala uderzeniowa
interakcja struktury płynu
elastomery
panel energochłonny
FEM
blast wave
fluid structure interaction
elastomers
protective panel
Opis:
The paper presents numerical and experimental analysis of combined multilayer protective panels. The developed structures are prospective solutions for enhancing protection of military vehicles and crucial elements of pipelines especially in places like river crossings.
Źródło:
Acta Mechanica et Automatica; 2012, 6, 1; 148-153
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of the tension and compression behavior of sintered 316L using micro computed tomography
Autorzy:
Doroszko, M.
Seweryn, A.
Powiązania:
https://bibliotekanauki.pl/articles/387023.pdf
Data publikacji:
2015
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
finite element method
X-ray microtomography
porous materials
mechanical properties
plasticity
metoda elementów skończonych (MES)
mikrotomografia rentgenowska
materiały porowate
plastyczność
właściwości mechaniczne
Opis:
This paper describes the method of numerical modeling of the tension and compression behavior of sintered 316L. In order to take into account the shape of the mesostructures of materials in the numerical modeling, X-ray microtomography was used. Based on the micro-CT images, three-dimensional geometrical models mapped shapes of the porosity were generated. To the numerical calculations was used finite element method. Based on the received stress and strain fields was described the mechanism of deformation of the materials until fracture. The influence of material discontinuities at the mesoscopic scale on macromechanical properties of the porous materials was investigated.
Źródło:
Acta Mechanica et Automatica; 2015, 9, 2; 70-74
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł

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