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首页> 外文期刊>Journal of Applied Physics >Dynamic mechanical response of magnesium single crystal under compression loading: Experiments, model, and simulations
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Dynamic mechanical response of magnesium single crystal under compression loading: Experiments, model, and simulations

机译：压缩载荷下镁单晶的动态力学响应：实验，模型和模拟

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摘要

Magnesium single crystal samples are compressed at room temperature under quasistatic (～0.001 s_(-1)) loading in a universal testing machine and dynamic (430, 1000, and 1200 s_(-1)) loading in a split Hopkinson pressure bar system. Stress-strain curves show that (a) the fracture strain slightly increases with the strain rate; and (b) the maximum strength and strain hardening rate increase significantly when the testing changes from quasistatic to dynamic, although they do not vary much when the strain rate for dynamic testing varies in the range of 430-1200 s_(-1). The operation of the secondary pyramidal slip system is the dominating deformation mechanism, which leads to a fracture surface with an angle of ～42° with respect to the loading axial direction. A theoretical material model based on Johnson-Cook law is also derived. The model includes the strain hardening and strain rate hardening terms, and provides the stress-strain relations matching with the experimental results. Finite element simulations for the strain rates used in the experiments predict the mechanical responses of the material that agree well with the experimental data.
机译：镁单晶样品在室温下在通用测试仪中的准静态（〜0.001 s _（-1））负载下压缩，在分离式Hopkinson压力棒系统中在动态（430、1000和1200 s _（-1））负载下压缩。应力-应变曲线表明：（a）断裂应变随应变速率的增加而略有增加； （b）当测试从准静态变为动态时，最大强度和应变硬化率显着增加，尽管当动态测试的应变率在430-1200 s _（-1）范围内变化时，它们的变化不大。二次金字塔滑移系统的操作是主要的变形机制，它导致相对于加载轴向方向成〜42°角的断裂表面。还推导了基于Johnson-Cook定律的理论材料模型。该模型包括应变硬化和应变速率硬化项，并提供与实验结果匹配的应力-应变关系。实验中所用应变率的有限元模拟预测了材料的机械响应，该响应与实验数据非常吻合。

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  • 来源
    《Journal of Applied Physics》 |2011年第10期|p.371-378|共8页
  • 作者

    Qizhen Li;

  • 作者单位

    Department of Chemical and Materials Engineering, University of Nevada, Reno, Reno, Nevada 89557, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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