Fatigue tests on welded small‐scale specimens often do not show a distinct residual stress influence. An exception is longitudinal stiffeners, which are therefore frequently used to study the influence of welding residual stresses on fatigue. The results are not directly transferable to other weld geometries because the residual stress distribution depends on the weld geometries. In the presented investigation, fatigue tests on multilayer K‐butt weld and longitudinal stiffener specimens were performed. The tests were carried out in the as‐welded and stress‐relieved conditions at different load ratios. Initiation of macroscopic cracks was detected using digital image correlation. This allowed determining the influence of welding residual stresses on the initiation of macroscopic cracks, crack propagation and total fatigue life for both investigated weld geometries.

中文翻译：

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两种不同几何形状的焊接残余应力对疲劳影响的实验研究

对焊接的小尺寸试样的疲劳测试通常不会显示出明显的残余应力影响。纵向加劲肋是个例外，因此经常用于研究焊接残余应力对疲劳的影响。结果不能直接转移到其他焊缝几何形状，因为残余应力分布取决于焊缝几何形状。在本研究中，对多层K对接焊缝和纵向加劲肋样品进行了疲劳测试。测试是在焊接和应力消除条件下以不同的负载比进行的。使用数字图像相关性检测到宏观裂纹的产生。这样就可以确定焊接残余应力对宏观裂纹产生的影响，