Abstract According to the existing experimental investigation on the ratchetting-fatigue interaction of SUS301L stainless steel butt-welded joint, a new life-prediction model addressing the important role of ratchetting is developed based on the ductility exhaustion theory (DET) and continuum damage mechanics (CDM). The total ductility damage is assumed to consist of fatigue ductility and ratchetting ductility ones, and the ductility and corresponding damage variables are defined in a strain-based form in the proposed life-prediction model. The proposed model is employed to predict the stress-controlled low-cycle fatigue life of SUS301L stainless steel butt-welded joint based on the local strain in its fusion zone FZ-1 measured directly by using the digital image correlation (DIC) technology, and the predicted results show a good agreement with the experimental ones.

中文翻译：

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考虑棘轮效应的SUS301L不锈钢对焊接头低周疲劳寿命预测模型

摘要 根据已有的SUS301L不锈钢对焊接头棘轮疲劳相互作用的实验研究，基于延性耗竭理论（DET）和连续损伤力学，建立了一种新的寿命预测模型，解决了棘轮的重要作用。清洁发展机制）。假设总延性损伤包括疲劳延性和棘轮延性，延性和相应的损伤变量在建议的寿命预测模型中以基于应变的形式定义。采用该模型，基于数字图像相关（DIC）技术直接测量的熔合区FZ-1局部应变，预测SUS301L不锈钢对焊接头的应力控制低周疲劳寿命，