基于结构应力法的焊缝错边疲劳性能分析

Analysis on the Fatigue Performance of Welding Seam Misalignment Based on Structural Stress Method

为了研究焊缝错边程度及相关错边处理方法对焊接件疲劳性能的影响,选用常见的对接焊试件作为研究对象,基于结构应力法,采用有限元软件ABAQUS分别计算试件在拉伸荷载、弯曲荷载和拉-弯组合荷载作用下的应力集中系数和疲劳寿命,分析错边程度、堆焊坡度、焊缝余高、焊趾半径等参数对疲劳性能的影响规律。研究结果表明:焊缝错边对拉伸荷载和拉-弯组合荷载较为敏感,且疲劳性能随错边程度的增加明显下降;焊缝错边对弯曲荷载不敏感,且当拉-弯组合荷载中弯曲荷载比例增大时,疲劳性能明显提升;设置堆焊坡度对改善拉伸荷载工况下疲劳性能效果最为显著,而焊缝余高和焊趾半径对疲劳性能的影响较小。

In order to study the influence of welding seam misalignment value and related misalignment treatment methods on the fatigue performance of welded parts,common butt welding test specimens were selected as the research object.Based on the structural stress method,the finite element software ABAQUS was used to calculate the stress concentration factor and fatigue life under tensile load,bending load and tensile-bending combination load respectively.The effects of misalignment value,surfacing slope,weld reinforcement and weld toe radius on fatigue performance were analyzed.The research results show that the welding seam misalignment is more sensitive to tensile load and tensilebending combination load,and the fatigue performance decreases significantly with the increase of the misalignment value.The weld misalignment is not sensitive to bending load,and the fatigue performance is significantly improved with the increase of bending load proportion in tension-bending combination load.The surfacing slope has the most significant effect on improving the fatigue performance under tensile load,while the weld reinforcement and weld toe radius have little effect on the fatigue performance.