【摘要】 焊接结构的疲劳破坏往往发生于焊缝部位,对于焊缝部位的疲劳分析常用方法有基于名义应力的BS7608标准的、IIW标准的方法,以及基于结构应力的ASME方法。基于等效结构应力的主S-N曲线疲劳寿命预测法由新奥尔良大学的董平沙教授提出,该方法具有疲劳寿命结果不受有限元模型网格大小影响,以及不受接头类型限制的主S-N曲线数据等特点。分析了该方法的疲劳寿命预测原理,并对某搭接接头进行实例分析,验证了该方法的可行性。更多还原

【Abstract】 Fatigue damage of the welded structure often occurred in the weld seam,the seam fatigue analysis methods commonly used are based on the nominal stress method,such as the BS7608 and IIW,also based on the structural stress method such as ASME.The equivalent stress of the main S-N curve fatigue life prediction method is proposed by professor Dong Pingsha of the University of New Orleans,the result of fatigue life is not affected by the finite element grid size and this method has the main characteristics of S-N curve data which is not limited by the type of joints.Analyzes the method of fatigue life prediction theory,and a lap joint example is analyzed to verify the feasibility of the method.更多还原