航空学报 > 1995, Vol. 16 Issue (2): 120-125

幂硬化材料平面应力裂纹稳定扩展的有限元模拟

朱文浩   

  1. 华中理工大学力学系, 武汉, 430074
  • 收稿日期:1993-09-08 修回日期:1994-02-23 出版日期:1995-04-25 发布日期:1995-04-25

A FINITE ELEMENT SIMULATION OF STABLE CRACK PROPAGATION IN POWER LAW HARDENING MATERIALS UNDER PLANE STRESS

Zhu Wenhao   

  1. Dept. of Mech.,Huazhong University of Science & Technology,Wuhan, 430074
  • Received:1993-09-08 Revised:1994-02-23 Online:1995-04-25 Published:1995-04-25

摘要: 对幂硬化材料中平面应力Ⅰ型裂纹的稳定扩展进行了有限元模拟。计算中采用了逐步释放裂尖节点力法和子结构方法并配合裂尖附近高密度的网格划分,获得了有关裂尖应力变形场、塑性区尺寸、裂纹开口位移、裂纹扩展阻力等大量资料。计算结果还证实了部分已有的裂尖场渐近解。

关键词: 裂纹扩展, 有限元法, 裂纹抑制

Abstract: A detailed finite element analysis of stable crack growth in power law hardening materials is performed under mode-I plane stress condition. A nodal release procedure and a substructure method are used, combining with a very fine mesh near the crack tip. Detailed numerical results for the near-tip stress and deformation fields, plastic zone, crack opening displacement, propagation resistance, etc. are presented and comparisons are made with existing analyses.

Key words: crack propagat ion, finite element method, crack arrest

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