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。
The effects of strength matching and specim en geometry on the fracture behavior for welded joint are conducted by 3-D FE a nalysis based on the local approach. Firstly ,the parameters controlling brittle fracture are gotten from the fracture toughness result of standard 3 point bendi ng specimen,then the fracture behavior of the tension specimen for the welded jo int with different strength matching are predicted based on the local appro ach.It is found that the result predicted is in a good agreement with the experi ment,and the local approach gives a good description of brittle fracture even th ough ductile crack growth prior to final fracture occurs.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2000年第9期48-51,共4页
Journal of Mechanical Engineering
基金
天津市自然科学基金资助项目!(003603911)
关键词
断裂韧度
延性裂纹扩展
强度匹配
焊接接头
Local approach
Fracture toughness
Ductile crack growth
Strength matching
