Abstract The application of fracture mechanics to the determination of the fatigue behavior of weldments is discussed with the focus on classic fatigue, i.e., the overall fatigue life and the fatigue strength in terms of an S-N curve and the endurance limit. The following issues are addressed: specific features of short fatigue crack propagation, an adequate initial crack size, multiple crack propagation and its statistical treatment as well as welding residual stresses. As an example, an approach of the authors is applied to the determination of FAT classes for a butt weld with varying weld toe geometry.

中文翻译：

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断裂力学在焊接疲劳中的应用

摘要 讨论了断裂力学在确定焊件疲劳行为中的应用，重点讨论了经典疲劳，即总疲劳寿命和疲劳强度以SN曲线和耐久极限表示。解决了以下问题：短疲劳裂纹扩展的特定特征、足够的初始裂纹尺寸、多裂纹扩展及其统计处理以及焊接残余应力。例如，作者的一种方法应用于确定具有不同焊趾几何形状的对接焊缝的 FAT 等级。