Abstract:

Elastic-plastic deformation behaviors of strength mis-matched welded joints with cracks were investigated using finite element method.Effects of strength mis-matching,hardening property of weld metal and crack length on plastic deformation were analyzed.The results show that strength mis-matching has significant influence on plastic deformation of welded joint.Deformation is first concentrated in weld for under-matched joint,while for over-matched joint,strength over-matching can protect weld metal to some extent.When strength mis-matching facor is constant,the plastic deformation trends for welded joints with different hardening properties of weld metals are similar,whereas local plastic deformation levels are different.Plastic deformation increases with the hardening property of weld metal decreasing.

Key words: strength mis-matching, welded joint, elastic-plastic deformation, finite element method

摘要：

采用有限元方法对平面应变条件下含裂纹不同强度失配的平板拉伸焊接接头的弹塑性变形进行了分析,研究了焊缝与母材强度失配系数、焊缝硬化性能、裂纹长度等对接头塑性变形的影响。结果表明：强度失配系数对接头塑性变形有显著影响。低匹配时,变形首先集中在焊缝中,而高匹配则对焊缝起到了一定的保护作用。失配系数一定时,不同焊缝硬化性能接头的塑性变形发展趋势是一致的;但当外载较大时,局部塑性变形程度不同,焊缝的硬化性能降低,裂尖塑性变形增大。
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关键词: 强度失配, 焊接接头, 弹塑性变形, 有限元法