基于结构应力的焊接接头多轴高周疲劳寿命估算

该文对承受弯扭组合载荷下的焊接接头危险点焊趾处进行了疲劳应力分析.结合结构应力考察了在比例载荷和非比例载荷下焊趾处临界面上的应力分量;建立了基于结构应力和修改的Whler曲线法的临界面上多轴疲劳寿命估算方法;采用该方法对某管板焊接接头进行了多轴估算,将评定结果与文献中的疲劳试验数据做了比较,同包括欧洲钢结构规范3在内的其他的多轴疲劳评定方法相比,文中提出的多轴寿命估算结果最好,而且该方法具有网格划分不敏感性.

MULTIAXIAL HIGH-CYCLE FATIGUE LIFE PREDICTION OF WELDED JOINTS BASED ON STRUCTURAL STRESS

In this paper, fatigue stress at welded toes of welded joints is analyzed ,which is under bending and tortion loading. Stress state on critical plane at welded toes is studied with structural stress under in-phase and out-of-phase loading; Multiaxial fatigue life prediction method of welded joints was built based on structural stress and modified Wohler curve mothod;Some tube-to-plate welded joints under multiaxial loading was estimated using the proposed method, the results were compared with fatigue test data from related literature,The proposed method give the best results compared with some multiaxial fatigue prediction methods including Eurocode3 and the method have a good mesh-size insensitive characteristics.