Abstract This study proposed the fatigue life prediction method for welded joints which is considered the geometric effect, the difference of cyclic stress–strain properties between parent material, the HAZ, and weld metal, and the mean stress effect by welding residual stress and fatigue loading. The proposed prediction method consists of the finiteelement analyses, which are the welding simulation and the nonlinear structural analysis applied fatigue loading, and the estimation method of the fatigue crack initiation and the fatigue crack propagation. The proposed method indicated as being able to successfully predict the fatigue life for 9% Ni steel butt welded joints.

中文翻译：

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9%Ni钢对焊接头疲劳寿命预测

摘要 本研究提出了焊接接头疲劳寿命预测方法，该方法考虑了几何效应、母材、热影响区和焊缝金属之间循环应力-应变特性的差异，以及焊接残余应力和疲劳载荷的平均应力效应。 . 所提出的预测方法包括有限元分析，即施加疲劳载荷的焊接模拟和非线性结构分析，以及疲劳裂纹萌生和疲劳裂纹扩展的估计方法。所提出的方法表明能够成功预测 9% Ni 钢对焊接头的疲劳寿命。