焊缝宽度对对接接头疲劳强度的影响

Influence of weld width on fatigue strength of butt joint

基于建立的Q235A钢对接接头3D实体模型进行有限元分析,模拟焊缝宽度对焊缝对接接头疲劳强度的影响.使用ABAQUS CAE软件建立8种不同焊缝宽度几何模型,对模型进行网格划分并计算结构应力.基于网格不敏感结构应力法分析对接接头的应力,使用ABAQUS软件中Fe-safe模型进行疲劳寿命预测.模拟结果表明:对接接头焊缝的疲劳性能先随焊缝宽度增大而增强,随着焊缝宽度的继续增大,疲劳性能反而有逐渐减弱的趋势.

Finite element analysis based on the establishment of a 3D solid model of the butt joint of Q235A steel was conducted, and the influence of weld width on the fatigue strength of the butt joint was simulated.Eight geometric models of different weld widths were established by ABAQUS CAE software. The meshing of the model was carried out and the structural stress was calculated. The stress of butt joint was analyzed based on mesh insensitive structural stress method. The Fe-safe model of ABAQUS software was used to predict the fatigue life. The simulation results show that the fatigue properties of butt joint weld firstly increase with the increase of weld width, and then gradually decrease with the increase of weld width.