This study aimed to investigate the design S-N curve on the basis of the hot spot stress (HSS) approach considering proper thickness effect for welded aluminum joints. The effect of the main plate thickness is examined by using the results of fatigue tests in this study and references of fatigue data of previous literature. The fatigue tests are performed on 5083-O welded joint specimens with four kinds of main plate thicknesses, namely 12 mm, 16 mm, 20 mm, and 25 mm. The main plate thicknesses of the fatigue data of the references ranged from 2.8 to 25 mm. We clarify the relationship between fatigue strength and main plate thickness, and propose hot spot design S-N curve for welded aluminum joints with thickness of less than 25 mm based on the research of the thickness effect. Fatigue tests of large-scale model are carried out to test the validity of the proposed design S-N curve for welded structures.

中文翻译：

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铝焊接点热点SN曲线的厚度效应

这项研究旨在研究热点应力（HSS）方法的基础上设计的SN曲线，其中考虑了铝焊缝的适当厚度效应。通过使用本研究中的疲劳测试结果并参考先前文献的疲劳数据来检查主板厚度的影响。在5083-O焊接接头试样上进行了疲劳测试，该试样具有四种主板厚度，即12 mm，16 mm，20 mm和25 mm。参考文献疲劳数据的主板厚度范围为2.8至25 mm。我们弄清了疲劳强度与主板厚度之间的关系，并基于厚度效应的研究，提出了厚度小于25mm的焊接铝接头的热点设计SN曲线。