• CN:11-2187/TH
  • ISSN:0577-6686

›› 2000, Vol. 36 ›› Issue (9): 48-51.

• 论文 • 上一篇    下一篇

非均质焊接接头断裂行为预测研究

荆洪阳;霍立兴;张玉凤;徐德录   

  1. 天津大学材料学院;国家电力公司电力建设研究所
  • 发布日期:2000-09-15

PREDICTION OF FRACTURE TOUGHNESS FOR NON-HOMOGENEOUS WELDED JOINTS

Jing Hongyang;Huo Lixing;Zhang Yufeng;Xu Delu   

  1. Tianjin University Electric Power Construction Research Institute, National Power Cooperation
  • Published:2000-09-15

摘要: 基于局部法定量研究了焊接接头中强度匹配、试样几何形式对接头断裂行为的影响。首先由标准三点弯曲试样的断裂韧度值,得出反映材料脆性断裂的控制参量,再根据该参量对不同接头强度匹配下三点弯曲和双边裂纹拉伸试样的断裂行为进行了定量预测,当考虑由于延性裂纹扩展所造成的应力升高后,其结果与试验结果相当吻合。表明局部法能很好地描述材料的断裂行为。

关键词: 断裂韧度, 局部法, 强度匹配, 延性裂纹扩展

Abstract: The effects of strength matching and specimen geometry on the fracture behavior for welded joint are conducted by 3-D FE analysis based on the local approach. Firstly , the parameters controlling brittle fracture are gotten from the fracture toughness result of standard 3 point bending specimen, then the fracture behavior of the tension specimen for the welded joint with different strength matching are predicted based on the local approach. It is found that the result predicted is in a good agreement with the experiment, and the local approach gives a good description of brittle fracture even though ductile crack growth prior to final fracture occurs.

Key words: Ductile crack growth, Fracture toughness, Local approach, Strength matching

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