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首页> 外文期刊>Transactions of JWRI >Fatigue life assessment of a non-load carrying fillet joint considering the effects of a cyclic plasticity ana weld bead shape
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Fatigue life assessment of a non-load carrying fillet joint considering the effects of a cyclic plasticity ana weld bead shape

机译：考虑循环塑性和焊缝形状的影响的无载荷角焊缝疲劳寿命评估

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摘要

Fatigue life depends strongly on irreversible contributions that accumulate during cyclic loading and unloading of structures. However, the correct identification of the loading path in terms of uniaxial or multi-axial stress states, proportional or non-proportional loading is essential because these factors can significantly alter the material response. In this study, finite element analysis is conducted to assess the fatigue crack initiation life of a non-load carrying fillet joint by considering weld bead shape and a cyclic plasticity accumulation during fatigue loading, which is a main cause of crack initiation. Cyclic plasticity behavior including cyclic hardening and softening together was investigated with an unconventional plasticity model called the subloading surface model and extended to include both elastic boundary and cyclic damage concepts. The cyclic plasticity model can capture realistic plastic strain accumulation during high cycle fatigue under macroscopically elastic stressing conditions.
机译：疲劳寿命在很大程度上取决于在结构的周期性加载和卸载过程中累积的不可逆贡献。但是，根据单轴或多轴应力状态，比例或非比例加载正确识别加载路径至关重要，因为这些因素会显着改变材料的响应。在这项研究中，进行了有限元分析，通过考虑焊缝形状和疲劳加载过程中的循环可塑性积累，来评估非承载角焊缝的疲劳裂纹萌生寿命，这是裂纹萌生的主要原因。循环塑性行为，包括循环硬化和软化在一起，用一种称为子载荷表面模型的非常规塑性模型进行了研究，并扩展到包括弹性边界和循环损伤概念。循环可塑性模型可以捕获宏观弹性应力条件下高周疲劳期间的实际塑性应变累积。

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