焊缝余高对焊接接头疲劳寿命影响的有限元分析

Finite Element Analysis of Influence of Weld Reinforcement on Fatigue Life of Welded Joints

使用Pro/E软件建立3种不同焊缝余高的焊接接头的几何模型,使用Hypermesh软件对接头进行网格划分,使用ABAQUS软件进行应力模拟分析,根据IIW标准,进行了基于名义应力法和热点应力法的接头疲劳寿命预测;使用ANSYS FE-SAFE软件进行基于网格不敏感结构应力法的疲劳寿命预测。结果表明:焊缝余高的存在降低了焊接接头的疲劳强度,且焊缝余高越大,疲劳寿命越差。

Three geometric models with different weld reinforcement were established by using Pro/E software, and the finite element mesh of welded joints were done by using Hypermesh software. Stress simulation was carried out by using ABAQUS software, and fatigue life prediction of weld joints based on nominal stress method and hot spot stress method was carried out according to the IIW standard.Fatigue life prediction of weld joints based on grid insensitive structural stress method was carried out by using ANSYS-SAFE software. The results show that weld reinforcement reduces the fatigue strength of welded joints, and the reinforcement is hie.her, the fatigue life is worse.