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Recent Advances in computational materials Science

Recent Advances in Computational Materials Science

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the 18th international symposium on computational mechanics of materials

作者： S.Schmauder Institut for materials Testing Materials Science and Strength of Materials（IMWF）University of StuttgartPfaffenwaldring 32D-70569 Stuttgart

＜正＞In this contribution we will report on recent advances in computational materials Science （CMS） with respect to scale bridging aspects in modelling and simulation of materials and components mechanical behaviour.

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Estimation of the critical stress for failure of layered composite materials

Estimation of the critical stress for failure of layered com...

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the 18th international symposium on computational mechanics of materials

作者： L.Náhlík L.estáková P.Hutar Z.Knésl Institute of Physics of materials Academy of Sciences of the Czech Republic Zizkova 22616 62 BrnoCzech Republic Department of Solid mechanics Mechatronics and BiomechanicsFaculty of Mechanical EngineeringBrno University of TechnologyBrnoCzech Republic

＜正＞the contribution describes a study of the behaviour of a crack growing in a layered composite material and penetrating through an interface from one layer into a second one. Special attention is devoted to a cra... 详细信息

关键词： Interface layered materials crack stability critical stress ceramic composites

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Molecular modeling pertinent to quasi-static and low rate loadings:Molecular Statistical thermodynamics（MST） and Molecular Kinetics（MK）

Molecular modeling pertinent to quasi-static and low rate lo...

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the 18th international symposium on computational mechanics of materials

作者： Zhijun ZHENG~1 Yizhe TANG~1 Haiying WANG~1 Mengfen XIA~1 Fujiu KE~(1 2) and Yilong BAI~1 1 State Key Laboratory of Nonlinear mechanics(LNM) Institute of mechanics Chinese Academy of Sciences Beijing 100080 China 2 Department of Physics Beihang University Beijing 100083 China

＜正＞Molecular dynamics（MD） are now orthodox for simulating molecular-scale models of matter,by solving N-body problem of classical ***,MD simulations are usually limited to very short duration,owing to the very high frequency of atomic oscillation in solid lattice,like 1013Hz,and to very small size（usually smaller thanμm） at a great expense of ***,to explore novel and efficient methods pertinent to realistic loadings becomes an urgent need in computational mechanics.

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Simulation of the deformation field induced by micro particle impacts

Simulation of the deformation field induced by micro particl...

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the 18th international symposium on computational mechanics of materials

作者： S.T.Yang Y.M.Xing Y.R.Zhao A.F.Jiang Department of Applied mechanics Inner Mongolia University of Technology

＜正＞HVOF sprayed metallic coating can be used to create a surface layer which plays a significant role in enhancing the overall strength,stiffness and fatigue life of the treated *** effect of surface treatment on the static mechanical behavior of a low carbon sheet is investigated in this *** particle impact process is simulated *** microscopic deformation field induced by micro particle impact on the surface of the stainless steel was determined using the FEM. An analysis of the stress distribution in a sample section shows that the compressive residual stress in surface layer takes on a substantial percentage of the load because of its high elastic *** is the mechanism for augmenting the hardness and strength of the *** was performed to compare with numerical simulation.

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Cyclic Plastic Deformation and Fatigue Damage of Metals Under Multiaxial Nonproportional Straining

Cyclic Plastic Deformation and Fatigue Damage of Metals Unde...

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the 18th international symposium on computational mechanics of materials

作者： M.Vormwald R.Dring Technische Universitt Darmstadt Materials Mechanics GroupPetersenstr.12D-64287 DarmstadtGermany

＜正＞the knowledge of local stress and strain histories at critical sites of engineering structures is a basic prerequisite for the numerical assessment of fatigue *** is necessary that suitable plasticity models are available which can describe essential effects of cyclic metal plasticity like Bauschiner’s effect,cyclic hardening and softening, ratcheting and nonproportional hardening. From a practical point of view the plasticity model must be able to handle several millions of cycles in an acceptable time *** are presented which have been obtained by applying a recently developed model which itself is an extension of continuum mechanics based incremental plasticity models like those of Prager / Ziegler,Chaboche or Jiang. Especially the ability for processing nonproportional hardening has been added. this new deformation model has been implemented in different numerical simulation *** comparison of calculated and experimentally established results shows a very good correlation. the fatigue damage behaviour of metallic materials is dominated by the propagation of small fatigue *** development of models for fatigue crack growth prediction has been a logical consequence of this fact. Fracture mechanics based approaches have therefore been able to promote the fatigue life estimation considerably.A fracture mechanics based short crack growth model has been developed applicable to multiaxial nonproportional *** most important issues are *** approach,a critical plane concept,is based on the crack growth relationship by Paris and the cyclic J-Integral as elastic plastic crack tip *** model takes into account crack closure, interaction of crack surfaces in shear mode and mixed mode loading which inevitably occurs with multiaxial nonproportional stresses and ***,it is shown,that the fatigue lives calculated with the short crack model agree well with experimental results and also with some established multiax

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