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Problemy Techniki Uzbrojenia
2011 R. 40, z. 117 163--167
PL W pracy przedstawiono wyniki badań granicy plastyczności spieku na osnowie wolframowej wykorzystywanego w produkcji penetratorów czołgowych pocisków podkalibrowych w próbie ściskania dla szybkości odkształceń równych 3ź10-2s-1i 7ź 10-2 s-1.
EN The results of strength investigations of the tungsten alloy are discussed in this paper. Quasi-static testing was carried out by of the INSTRON testing machine in FPS Bolechowo Ltd.
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TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
EN Basic elastic constants (Young’s modulus, Poisson’s ratio, shear modulus) were determined for several monocrystalline, metallic (Ni, Cu, Pt, Au) nanorods using molecular dynamics with the Sutton-Chen force field. Stress-strain curves were also calculated and discussed.
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Archives of Materials Science and Engineering
EN Purpose: The purpose of this study was to assess the extent to which magnesium alloy WE43 is susceptible to metal forming and to assess its structure after hot forming. Corrosion resistance evaluation of WE43 alloy in NaCl solutions, after casting and extrusion forging, was also made. Basic groups o[...]
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Zeszyty Naukowe Politechniki Białostockiej. Mechanika
2001 Z.24 91-100
PL W pracy podjęto próbę stabilizacji efektu kumulacji odkształceń plastycznych powstajacych w materiale w wyniku działania wieloosiowych obciążeń. W tym celu opracowano jednopowierzchniowy model przeznaczony do symulacji zachowania materiału w warunkach losowych obciążeń zewnętrznych. Wyniki obliczeń [...]
EN The paper deals with the ratchetting effect as observed under general nonproportional loading. Multisurface models, most frequently used for prediction of material behaviour under random loadings, account for the plastic strain progression. However, the predicted rates of strain, in general, differ [...]
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Journal of Theoretical and Applied Mechanics
2016 Vol. 54 nr 3 731--742
EN In this study, a finite strain formulation of elasto-plasticity without the yield surface is analyzed. It is found that the presented model allows for a good description of the elasto-plastic response for many metallic materials. Furthermore, it is noted that the model involving a limited number of [...]
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Computer Methods in Materials Science
2015 Vol. 15, No.2 265--293
PL Po ponad 40 latach rozwoju metoda elementów skończonych (MES) osiągnęła wysoki poziom doskonałości. W artykule przedstawiono krótki wstęp do rozwiązywania tą metodą zadań mechanicznych i cieplnych, a następnie opisano główne naukowe i techniczne aspekty rozwoju MES. Rozważono problemy numeryczne, ta[...]
EN After more than 40 years of development, finite element metal forming simulation has reached a high level of maturity. After a short mechanical and thermal introduction, the main scientific and technical developments are briefly described. We consider numerical issues, such as adaptive remeshing or [...]
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Journal of Theoretical and Applied Mechanics
2017 Vol. 55 nr 4 1113--1126
EN In the present study, the finite element (FE) implementation of elasto-plasticity without a yield surface is discussed. For that purpose, the method of perturbing the deformation gradient tensor is employed to calculate approximate tangent moduli. The development of a user subroutine that enables on[...]
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Archives of Metallurgy and Materials
EN A general proposition of an energy-based limit condition for anisotropic materials exhibiting strength-differential effect (SDE) based on spectral decomposition of elasticity tensors and the use of scaling pressure-dependent functions is specified for the case of orthotropic materials. A detailed al[...]
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Przegląd Mechaniczny
2005 nr 7-8 24-27
PL W artykule omówiono modelowanie numeryczne próby SICO i wykorzystanie wyników symulacji, obejmujących obliczenia pól odkształceń, naprężeń i temperatur, do wyznaczenia parametrów materiałowych w kryterium pękania. Przedstawiono metodykę fizycznej symulacji próby SICO. Próby zrealizowano na symulator[...]
EN Results of this simulation (stress, strain and temperature fields) are used to determination materials parameters in fracture criterion. Physical simulation of the SICO test was also described in the presented paper. Tests were performed on Gleeble 3800 simulator for steels with different contents o[...]
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Logistics and Transport
EN In this paper a short description is reported allowing to take into account some aspects to design structures used for automotive industries. It allows to define correctly the behaviour of a vehicle and mainly the passive structures to absorb energy during an accident or an impact. The main aspect r[...]
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Engineering of Biomaterials
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Archives of Metallurgy and Materials
2019 Vol. 64, iss. 3 1059--1065
EN Fuzzy logic determination of the material hardening parameters based on the Heyer’s method was applied in this research. As the fuzzy input variables, the length of two measuring bases and the maximum force registered in the Heyer's test were used. Firstly, the numerical experiment (the simulation o[...]
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Journal of Theoretical and Applied Mechanics
2003 Vol. 41 nr 3 443-457
PL W pracy przedstawiono metodę wyznaczania obciążeń granicznych dla powłok wrażliwych na niedoskonałości, z uwzględnieniem odkształceń plastycznych. Opierajac się na energii odksztalcenia powłok rozważono przypadek najgorszego scenariusza krytycznych perturbacji przy ustalonych poziomach obciążeń. War[...]
EN The paper presents a procedure for computation of the limit loads of imperfection-sensitive shells including plastic deformations. On the basis of strain energy of shells, the worst case scenario for critical perturbations at fixed load levels is investigated. Limit loads of cylindrical and conical [...]
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Archives of Mechanics
EN The symmetry issue of the interaction matrix between multiple slip-systems in the theory of crystal plasticity at finite deformation is revisited. By appealing to possibly non-uniform distribution of slip-system activity in a representative space-time element of a crystal, symmetry of the slip-syste[...]
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Archives of Mechanics
EN The paper presented is devoted to the application of the probabilistic computational analysis based on the stochastic finite element methods in the transient heat transfer problems; the field of application of the method introduced is the mechanics of composite materials. The composite materials con[...]
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Archives of Mechanics
EN Two gradient-dependent combinations of isotropic plasticity and scalar damage are proposed. The gradient enhancements of either the plasticity or the damage component of the theory are performed by introducing the Laplacian of a strain measure and an internal length parameter. This makes the constit[...]
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Archives of Mechanics
EN Different mezomechanical models were analysed in an attempt to estimate how large is the portion of elastic energy stored in plastically deformed polcrystalline metals which may be attributed to the residual microstresses, its remaining part being connected with the creation of defects inside the pa[...]
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Archives of Mechanics
2013 Vol. 65, nr 5 407--428
EN This paper deals with the development of a family of gradient-enhanced elasticity-damage-plasticity models for the simulation of failure in metallic and composite materials. The model incorporates finite deformations and is developed with the assumption of isotropy and isothermal conditions. The gra[...]
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Journal of Theoretical and Applied Mechanics
2017 Vol. 55 nr 4 1355--1368
EN In the present study, a shape memory alloy (SMA) phenomenological constitutive model is proposed that is capable of describing SMA superelastic behavior and the plasticity effect. The phase transformation constitutive model, by using strain and temperature as control variables to judge the phase tra[...]
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Archives of Metallurgy and Materials
EN In this paper, we report the complex crystallization kinetics of phase transition happening in Ti-Cu-based bulk metallic glasses (BMGs), which play significant roles in the glass formation with respect to their low reduced glass transition temperatures, Trg. The first exothermic event jus[...]
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