A semi‐analytical formula for calculating the notch stress field of cruciform welded joint under bending loading
A semi‐analytical formula for calculating the notch stress field of cruciform welded joint under bending loading
复制标题
弯曲载荷下十字形焊接接头缺口应力场的半解析计算公式
DOI：
10.1111/ffe.13323
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发表时间：
2020
影响因子：
3.7
通讯作者：
Enqian Liu
中科院分区：
文献类型：
--
作者：
W. Shen;Y. Qiu;Lin Xu;Enqian Liu
缺口应力法对十字形焊接试件进行疲劳评估需要建立精细的有限元模型，目前还没有适合工程应用的解析式或经验式缺口应力公式。基于线弹性断裂力学和奇异强度理论，提出了常用十字形接头缺口应力的简单半解析公式。考虑切口类型和不同开孔角度的影响，将公式进一步推广到U形切口和其他常见开孔角度。经过一系列的验证，发现所提出的基于奇异强度值的半解析应力公式能够简单、准确地预测弯曲载荷下的缺口应力，为工程中十字形焊接接头的疲劳评估提供了一种简便的评估方法。
A fine finite element model should be established in fatigue assessment of cruciform welded specimens in notch stress method, and there is no analytical or empirical notch stress formula suitable for engineering application. Based on linear elastic fracture mechanics (LEFM) and singular strength theory, this paper put forward a simple semi‐analytical formula of notch stress for commonly used cruciform joints. Considering the influence of incision types and different opening angles, the proposed formula is further extended to U‐shaped notch and other common opening angles. After a series of verification, it is found that the proposed semi‐analytical stress formula based on singular strength values can simply and accurately predict the notch stress under bending loading, which provides a simple assessment approach for fatigue assessment of cruciform welded joints in engineering.