• CN:11-2187/TH
  • ISSN:0577-6686

›› 1993, Vol. 29 ›› Issue (2): 91-96.

• 论文 • 上一篇    下一篇

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裂纹尖端滑移系选择的探讨

姚可夫;陈南平   

  1. 北京科技大学;清华大学
  • 发布日期:1993-03-01

RESEARCH ON THE CHOICE OF SLIP SYSTEM AT CRACK TIP

Yao Kefu;Chen Nanping   

  1. University of Science and Technology Beijing Qinghua University
  • Published:1993-03-01

摘要: 本文利用断裂力学知识和张量分析方法得到了外加应力在裂尖滑移系沿滑方向的分解剪切应力,并定义了裂纹尖端Schmid因子。本文还讨论了裂尖应力场对裂尖滑移系开动的影响。当裂纹尖端向外发射位错时,裂尖滑移系的选择由裂尖Schmid因子支配,并且在裂尖附近区域内位错源开动或螺位错交滑移时滑移系的选择也由裂尖Schmid因子支配。

关键词: 断裂力学, 裂纹扩展, 应力场

Abstract: The resolved shear stress along the slip direction of a slip system in the crack tip region was deduced, and the crack tip Schmid factor was defined. When the crack tip emitted dislocations, the choice of slip systems at crack tip depended on the crack tip Schmid factor. And in the vicinity of crack tip. When dislocation sources were activated or cross slip of screw dislocation was taken placed, the choice of slip systems also depended on the crack tip Schmid factor.

Key words: Crack propagation, Fracture mechanics, Stress field