• CN:11-2187/TH
  • ISSN:0577-6686

›› 1991, Vol. 27 ›› Issue (6): 45-50.

• 论文 • 上一篇    下一篇

平面应力条件下裂端约束与裂纹启裂准则

孙军;邓增杰;涂铭旌;李鹤林   

  1. 西安交通大学;中国石油天然气总公司
  • 发布日期:1991-11-01

CRACK TIP CONSTRAINT AND FRACTURE CRITERION AT CRACK GROWTH INITIATION IN PLANE STRESS CASE

Sun Jun;Deng Zengjie;Tu Mingjing;Li Helin   

  1. Xi'an Jiaotong University Chinese Company of Petroteum and Natural Gas
  • Published:1991-11-01

摘要: 本文利用有限元方法对平面应务条件下带有不同裂纹深度的各种裂纹试样裂端应力三轴性约束水平及其他性质进行了大量的计算分析。结果表明:平面应力裂端约束强度完全符合HRR场的要求,而且与试样几何形状、裂纹深度、材料状态等基本无关。由此确保了J积分主导裂端场的有效性、裂纹启裂准则的材料党数性质及其有同等裂端约束条件下表征不同材料断裂韧度的可比性,并得到实验结果的证明。

关键词: 裂纹, 启裂准则, 应力

Abstract: Finite element calculation and analysis have been performed to investigate the stress triaxiality constraint level and other features in the crack tip fields of various specimens geometries with different crack depths in plane stress case. The results showed that the crack tip constraint intensity for plane stress is in bettor agreement with that required by the HRR solution and independent essentially from specimen geometries, crack depths and materials states. Therefore, the validity of J-dominance of crack tip fields is ensured and the critical value of J integral at crack growth initiation can be considered as the material constant, which can be used to characterize and compare the fracture toughness for different materials states in the case of same crack tip constraint. And the viewpoints have been verified by experimental results.

Key words: 裂纹, 启裂准则, 应力