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Investigation on crack propagation in single crystal Ag with temperature dependence

机译：与温度有关的单晶银中裂纹扩展的研究

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摘要

Crack propagation behaviors in a precracked single crystal Ag under mode I loading at different temperatures are studied by molecular dynamics simulation. The simulation results show that the crack propagation behaviors are sensitive to external temperature. At 0 K, the crack propagates in a brittle manner. Crack tip blunting and void generation are first observed followed by void growth and linkage with the main crack, which lead to the propagation of the main crack and brittle failure immediately without any microstructure evolution. As the temperature gets higher, more void nucleations and dislocation emissions occur in the crack propagation process. The deformation of the single crystal Ag can be considered as plastic deformation due to dislocation emissions. The crack propagation dynamics characterizing the microstructure evolution of atoms around the crack tip is also shown. Finally, it is shown that the stress of the single crystal Ag changes with the crack length synchronously.
机译：通过分子动力学模拟研究了预裂纹单晶银在I型载荷下在不同温度下的裂纹扩展行为。仿真结果表明，裂纹扩展行为对外部温度敏感。在0 K时，裂纹以脆性方式扩展。首先观察到裂纹尖端钝化和产生空隙，然后出现空隙生长并与主裂纹连接，这导致主裂纹的扩展和脆性破坏，而没有任何微观结构的演变。随着温度升高，在裂纹扩展过程中会出现更多的空核和位错排放。由于位错发射，单晶Ag的变形可以被认为是塑性变形。还显示了裂纹扩展动力学，表征了裂纹尖端周围原子的微观结构演变。最后表明，单晶Ag的应力随裂纹长度的变化而同步变化。

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  • 来源
    《Journal of Materials Research》 |2015年第22期|3553-3563|共11页
  • 作者

    Xue Feng Liu; Jin Bao Wang; Li Gang Sun; Ying Yan Zhang; Mei Ling Tian; Xiao Qiao He;

  • 作者单位

    Architecture and Civil Engineering Research Centre, Shenzhen Research Institute, City University of Hong Kong, Shenzhen 518057, China;

    School of Shipping, Port & Civil Engineering, Zhejiang Ocean University, Zhoushan 316022, China;

    Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong, China;

    School of Computing, Engineering and Mathematics, Western Sydney University, Penrith, NSW 2751, Australia;

    School of Shipping, Port & Civil Engineering, Zhejiang Ocean University, Zhoushan 316022, China;

    Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong, China;

  • 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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