Multiaxial fatigue analysis of complex welded joints in notch stress approach

文献类型： 外文期刊

第一作者： Shen, Wei

作者： Shen, Wei;Yan, Renjun;He, Feng;Shen, Wei;Wang, Shaomin

作者机构：

关键词： Fatigue assessment; Multiaxial fatigue criterion; Complex welded joints; Notch stress method

期刊名称：ENGINEERING FRACTURE MECHANICS （ 影响因子：4.406； 五年影响因子：4.243 ）

ISSN： 0013-7944

年卷期： 2018 年 204 卷

页码：

收录情况： SCI

摘要： The notch stress method is often recommended for fatigue assessment of complex welded joints as it can consider the influence of weld toe geometric parameters on local stress. However, the application of the notch stress method is still in the exploratory stage in multiaxial fatigue compared with the traditional nominal stress method and structural stress method. Considering the geometric effect at the weld toe, the notch stress method describes the local stress with an accurate geometry model and the complex stress states at the damage point under multiaxial loading are determined in the local coordinate system. Using the notch stress method, six classical multiaxial fatigue criteria are re-evaluated for a series of typical welded joints in the literatures under both proportional and non-proportional loads. In order to evaluate the different criteria quantitatively, a statistical analysis is performed and the probability of non-conservative prediction is determined for each multiaxial fatigue criterion. The results show that the S-N curve for notch stress under multiaxial loading has a lower inclination and higher fatigue class compared with the uniaxial curve recommended by IIW.

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