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Study on the J-Integral Failure Assessment Curve of Heterogeneous Welded Joints

机译：异种焊接接头J-整体失效评定曲线的研究

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Based upon the J-integral parameter, plane strain elastic-plastic finite element analyses were carried out to calculate for failure assessment curve(FAC) for welded joints. The influences of strength mismatch of welded joints, the widths of welds and the crack sizes on FAC were discussed. The present results were compared with the current assessment curves of three levels, especially with advnaced level, proposed by BSI-PD6493-91. It was suggested that the mechanical properties of base metal or weld metal should be employed to calculate the parameter S_r for overmatching or undermatching joints, respectively, in order to simplify the numerical processes and engineering applications. In practice, this selection may even alter the safe or unsafe condition of an assessment.
机译：基于J积分参数，进行了平面应变弹塑性有限元分析，计算出焊接接头的失效评估曲线（FAC）。讨论了焊接接头强度失配，焊缝宽度和裂纹尺寸对FAC的影响。将当前结果与BSI-PD6493-91提出的三个级别（尤其是高级级别）的当前评估曲线进行了比较。建议采用母材或焊缝金属的力学性能分别计算过匹配或不匹配接头的参数S_r，以简化数值过程和工程应用。实际上，这种选择甚至可能改变评估的安全或不安全条件。

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