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MICRO-EXPERIMENTAL STUDY OF large plastic deformation FOR HIGH-PURITY POLYCRYSTALLINE ALUMINUM

Acta Mechanica Sinica 1991年第4期7卷 360-368页

作者：仲政杨卫黄克智 Currently in the Department of Engineering Mechanics Tongji University. Tsinghua University Beijing 100084China

This paper aims at revealing various micro- deformation characteristics, such as crystalline slip and grain boundary slide, which are recorded under scanning electronic microscope for high-purity aluminum tensile specimen at room temperature. These experimental data provide us direct evidence for shear localization near the grain boundary network via multi- directional grain boundary slide. The nonuniform deformation induced in the grain interiors would have decisive effect on the plastic flow and failure of polycrystalline materials.

关键词： polycrystals large plastic deformation grain boundary sliding micromechanics grid method

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Study on large plastic deformation of ductile materials based on finite element aided testing method

Study on large plastic deformation of ductile materials base...

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2014海峡两岸破坏科学与材料试验学术会议暨第十二届破坏科学研讨会/第十届全国MTS材料试验学术会议

作者： Di Yao Lixun Cai Chen Bao Shuang Qi School of Mechanics and Engineering Southwest Jiaotong University

The most important relationship to study the large deformation behaviors of ductile materials,such as necking in tension,distention in compression and fracture,is the uniaxial full-range constitutive *** on a finite element aided testing(FAT)method,the full-range constitutive relationships of ductile materials are *** true stress-true strain curve from necking to failure is obtained by a funnel-shaped ***,the true stress-true strain curve is used as the mutilinear constitutive relationship model in finite element *** large deformation behaviors of ductile materials are *** the simulating results to the testing results by DIC optical testing system,the simulating deformation characteristic curves,such as load-displacement curve,the diameter at the funnel root versus displacement curve and the funnel deformation outlines are closed to the testing *** the FAT method is applied on different materials,working temperature,loading modes and groups of *** on the accurate descriptions of the stress distribution on the cross section at the root of the necking zone,a mixed strength concept has been put forward to explain the failure mechanism of ductile materials under tensile *** FAT method has been successfully applied in the estimation of constitutive relationship under compression and the elongation of ductile materials.

关键词： Full-range constitutive relationship FAT method large plastic deformation Ductile materials

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Finite element simulations on the mechanical properties of MHS materials

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Acta Mechanica Sinica 2007年第1期23卷 65-75页

作者： Z. Y. Gao T. X. Yu D. Karagiozova Department of Mechanical Engineering Hong Kong University of Science &Technology Clear Water Bay Kowloon Hong Kong China Institute of Mechanics Bulgarian Academy of Sciences Acad. G. Bonchev Street Block 4 Sofia 1113 Bulgaria

Finite element simulations are carried out to examine the mechanical behavior of the metallic hollow sphere （MHS） material during their large plastic deformation and to estimate the energy absorbing capacity of these materials under uniaxial compression. A simplified model is proposed from experimental observations to describe the connection between the neighboring spheres, which greatly improves the computation efficiency. The effects of the governing physical and geometrical parameters are evaluated; whilst a special attention is paid to the plateau stress, which is directly related to the energy absorbing capacity. Finally, the empirical functions of the relative material density are proposed for the elastic modulus, yield strength and plateau stress for FCC packing arrangement of hollow spheres, showing a good agreement with the experimental results obtained in our previous study.

关键词： Cellular material Hollow sphere large plastic deformation Numerical simulation FEM

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