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A New Local Strain Based Approach to Low Cycle Fatigue Assessment of Welded Joint

机译：基于局部应变的焊接接头低周疲劳评估新方法

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摘要

Several T-shaped welded joint models are analyzed by finite element method for low cycle fatigue assessment in this paper. Joint is subjected to random loading blocks and strain history is counted by range pair-range counting method. Endeavor is exerted to correlate local strain range of coarse FE model that ignores the weld toe profile with strain range obtained by fine FE model that simulates toe profile. Other parameters such as main geometrical parameters, material properties and loading pattern are also taken into account. After that, strain range relationship is established. Numerical results show that weld toe radius is the most influential factor while others' effects are insignificant. At last, proposed approach is introduced to the analysis of T shaped welded joint test. It turns out simple and convenient in low cycle fatigue assessment since cumbersome modeling of weld local profile becomes not necessary.
机译：本文通过有限元方法对几种T形焊接接头模型进行了分析，以进行低周疲劳评估。关节承受随机载荷，并通过距离对-距离计数法对应变历史进行计数。力图使忽略焊趾轮廓的粗FE模型的局部应变范围与通过模拟趾轮廓的精细FE模型获得的应变范围相关。还考虑了其​​他参数，例如主要几何参数，材料特性和加载模式。之后，建立应变范围关系。数值结果表明，焊趾半径是影响最大的因素，而其他因素影响不明显。最后，将所提出的方法引入到T形焊接接头试验分析中。由于不需要对焊缝局部轮廓进行繁琐的建模，因此在低周疲劳评估中证明了简单方便。

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