TIG dressing significantly improves the fatigue strength of welded structures by enlarging the weld toe radius and thereby decreasing stress concentrations and stress gradients at the weld toe location. To accurately evaluate the fatigue life of welded members after TIG dressing, the present work proposes a new strategy by combining the relative stress gradient and effective notch stress method. For this purpose, 151 fatigue data containing various materials and weld types were collected to illustrate the applicability of the proposed strategy. The results show that the fatigue assessment classes adjusted by the relative stress gradient in the effective notched stress method are well suited for assessing the fatigue life of welded members after TIG dressing. Meanwhile, this study also determined the unified S-N curve of the effective notched stress method for assessing the fatigue life of welded members after TIG dressing, i.e., m = 4.4 and FAT326.

中文翻译：

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结合相对应力梯度和有效缺口应力法评价钢焊接件TIG修整后的疲劳寿命


TIG 修整通过扩大焊趾半径，从而降低焊趾位置的应力集中和应力梯度，显着提高焊接结构的疲劳强度。为了准确评估TIG修整后焊接件的疲劳寿命，本工作提出了一种结合相对应力梯度和有效缺口应力法的新策略。为此，收集了包含各种材料和焊缝类型的 151 个疲劳数据，以说明所提出策略的适用性。结果表明，有效缺口应力法中通过相对应力梯度调整的疲劳评估等级非常适合评估TIG修整后焊接件的疲劳寿命。同时，本研究还确定了评估TIG修整后焊接件疲劳寿命的有效缺口应力法的统一S-N曲线，即m=4.4和FAT326。