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Atomistic investigations of tensile and shear mechanical properties of nanotwinned copper with embedded defects

机译:具有嵌入缺陷的纳米孪晶铜的拉伸和剪切力学性能的原子学研究

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摘要

The tensile and shear mechanical properties of nanotwinned copper with embedded defects have been investigated by using molecular dynamics simulations. Simulation results show that the stress concentration at the tips of crack-like defects dominates the first partial dislocation nucleation at the onset of plastic deformation, the joint action of twin boundaries and dislocations controls the yield stress at the earlier plastic deformation stage and the dislocation/twin boundary-dislocation interactions determine the plastic flow stage. Furthermore, it is found that the yield stress decreases nonlinearly with the increase of the crack length, while it decreases almost linearly with the increase of the temperature.
机译:通过分子动力学模拟研究了具有缺陷的纳米孪晶铜的拉伸和剪切力学性能。仿真结果表明,在塑性变形开始时,裂纹状缺陷尖端的应力集中在第一部分位错成核中;孪晶边界和位错的共同作用控制了塑性变形早期和位错/孪生边界-位错相互作用决定了塑性流动阶段。此外,发现屈服应力随着裂纹长度的增加而非线性地减小,而随着温度的升高几乎线性地减小。

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    State Key Laboratory of Structure Analysis for Industrial Equipment Department of Engineering Mechanics, Dalian University of Technology Dalian 116024, P. R. China;

    State Key Laboratory of Structure Analysis for Industrial Equipment Department of Engineering Mechanics, Dalian University of Technology Dalian 116024, P. R. China;

    State Key Laboratory of Structure Analysis for Industrial Equipment Department of Engineering Mechanics, Dalian University of Technology Dalian 116024, P. R. China;

    State Key Laboratory of Structure Analysis for Industrial Equipment Department of Engineering Mechanics, Dalian University of Technology Dalian 116024, P. R. China;

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  • 正文语种 eng
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  • 关键词

    Nanotwinned materials; defect; plastic deformation; molecular dynamics simulation;

    机译:纳米孪晶材料;缺陷;塑性变形;分子动力学模拟;

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