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A study on the influence of stress concentration in DFZ on the growth of model I crack

机译：DFZ应力集中对Ⅰ型裂纹扩展影响的研究

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摘要

A dislocation-free zone (DFZ) near the tip of model I crack can be formed after dislocation emission.There is a second stress peak in the DFZ near plastic zone (PZ) besides a stress peak at the crack tip.In the paper,using a super-dislocation mode,the complex functions of stress and displacement fields in front of crack were derived,and based on MATLAB simulating,the relation between stress concentration in DFZ and the angle of inclined plane,as well as how the stress concentration in the DFZ was affected by the applied stress factor and the friction stress,were studied.The results show that peak stress in DFZ will change with the applied stress factor increasing and the friction stress decreasing,but the position of nucleation where the most serious concentration happens do not change,and the direction of crack growth do not change at all.
机译：释放位错后，可在模型I裂纹尖端附近形成无位错区（DFZ）。除了裂纹尖端处的应力峰外，在塑性区（PZ）附近的DFZ中还有第二个应力峰。采用超位错模式，推导了裂纹前应力场和位移场的复函数，并基于MATLAB仿真，分析了DFZ中应力集中与斜面角之间的关系，以及应力集中在应力集中的方式。研究结果表明，DFZ受外加应力因子和摩擦应力的影响。结果表明，DFZ中的峰值应力随外加应力因子的增加和摩擦应力的降低而变化，但成核位置发生最严重的集中不变，裂纹扩展的方向也完全不变。

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  • 来源
    《国际断裂力学2009年会》|2009年|189-193|共5页
  • 会议地点 Chengdu(CN);Chengdu(CN)
  • 作者

    Hao Fu; Jian Chen; Yanjie Ren; Jianjun He; Qingmin Sun; Min Hu;

  • 作者单位

    School of Energy and Power Engineering,Changsha University of Science and Technology,Changsha 410114,China Key Laboratory of Efficient and Clean Energy Utilization,College of Hunan Province,Changsha 410114,China;

    School of Energy and Power Engineering,Changsha University of Science and Technology,Changsha 410114,China Key Laboratory of Efficient and Clean Energy Utilization,College of Hunan Province,Changsha 410114,China;

    School of Energy and Power Engineering,Changsha University of Science and Technology,Changsha 410114,China Key Laboratory of Efficient and Clean Energy Utilization,College of Hunan Province,Changsha 410114,China;

    School of Energy and Power Engineering,Changsha University of Science and Technology,Changsha 410114,China Key Laboratory of Efficient and Clean Energy Utilization,;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    DFZ; Stress concentration; Super-dislocation; Model I crack; Crack growth;

    机译：DFZ;应力集中;超位错; I型裂纹;裂纹扩展;

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