中文摘要：

本文主要对焊接接头的多轴高周疲劳评估方法展开研究．针对某管板焊接接头，分别采用Von Mises等效应力法、Eurocode3规范方法、IIW规范方法以及修正Wohler曲线方法（MWCM）计算其多轴高周疲劳损伤寿命，并与试验寿命进行比较．对四种方法预测寿命的标准差进行分析．结果显示，等效应力法能够准确预测比例加载下的多轴高周疲劳寿命，但并不适用于估算非比例加载下的多轴疲劳损伤寿命，且预测结果偏于危险．MWCM既能够适用于比例加载下的多轴高周疲劳损伤寿命预测，也适用于非比例加载下的多轴高周疲劳损伤寿命预测，且预测寿命的标准差较小．

英文摘要：

The multiaxial high-cycle fatigue assessment method for welded joints was carried out .Von Mises equivalent stress method, Eurocode3 recommended method , IIW recommended method and Modified Wohler Curve Method （ MWCM ） were used to evaluate multiaxial high-cycle fatigue life of tube-plate welded joints , and results were compared with experimental fatigue life.Then the standard errors of estimated fatigue life for the four methods were analyzed .Results show that equiva-lent stress method can only be used to calculate multiaxial high-cycle fatigue life under proportional added multiaxial loads, whereas MWCM performed well to evaluate multiaxial fatigue life for welded structures subject to both proportional and non-proportional added multiaxial loads , moreover has a small standard error .