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Influence of crack tip constraint on void growth in ductile FCC single crystals

机译：裂纹尖端约束对延性FCC单晶中空洞生长的影响

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摘要

Effect of constraint (stress triaxiality) on void growth near a notch tip in a FCC single crystal is investigated. Finite element simulations within the modified boundary layer framework are conducted using crystal plasticity constitutive equations and neglecting elastic anisotropy. Displacement boundary conditions based on mode I, elastic, two term K-T field are applied on the outer boundary of a large circular domain. A pre-nucleated void is considered ahead of a stationary notch tip. The interaction between the notch tip and the void is studied under different constraints (T-stress levels) and crystal orientations. It is found that negative T-stress retards the mechanisms of ductile fracture. However, the extent of retardation depends on the crystal orientation. Further, it is found that there exists a particular orientation which delays the ductile fracture processes and hence can potentially improve ductility. This optimal orientation depends on the constraint level.
机译：研究了约束（应力三轴性）对FCC单晶中缺口尖端附近空洞生长的影响。修改后的边界层框架内的有限元模拟是使用晶体塑性本构方程并忽略弹性各向异性进行的。基于模式I，弹性，两项K-T场的位移边界条件应用于大圆形区域的外边界。在固定的缺口尖端之前考虑了预成核的空隙。在不同的限制条件（T应力水平）和晶体取向下研究了缺口尖端与空隙之间的相互作用。发现负T应力会延缓韧性断裂的机制。但是，延迟的程度取决于晶体的取向。此外，发现存在特定的取向，该特定的取向延迟延性的断裂过程并且因此可以潜在地改善延性。此最佳方向取决于约束级别。

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  • 来源
    《Materials Science and Engineering》 |2011年第3期|p.823-831|共9页
  • 作者

    P. Biswas; R. Narasimhan; A. Tewari;

  • 作者单位

    Material Characterisation and Modeling Croup, India Science Lab, General Motors Global Research and Development, GM Technical Centre India Pvt Ltd., India;

    Indian Institute of Science, Department of Mechanical Engineering, Bangalore 560012, India;

    Material Characterisation and Modeling Croup, India Science Lab, General Motors Global Research and Development, GM Technical Centre India Pvt Ltd., India;

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  • 正文语种 eng
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  • 关键词

    fracture; crystal plasticity; ductility; finite element analysis;

    机译：断裂;晶体可塑性延展性有限元分析;

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