钢桥对接焊缝残余应力及变形场数值分析与试验验证

发布时间：2018-06-25 14:18

本文选题：钢桥 + 对接焊缝　；参考：《铁道学报》2017年09期

【摘要】：为研究钢桥对接接头焊接残余应力及变形场的分布规律,基于ABAQUS软件建立16mm厚Q345qD钢板多层对接焊三维有限元模型,对焊接残余应力及变形场进行模拟预测,并对模拟结果进行试验验证。结果表明焊接残余应力和变形的数值模拟结果与试验实测值吻合较好。对接接头纵向焊接残余应力沿垂直于焊缝方向成拉-压分布状态,其最大值位于热影响区,约为350 MPa,接近材料的屈服强度;纵向残余应力在距焊缝中心60mm范围内为拉应力。横向焊接残余应力的应力水平相对较低,最大值约为100 MPa。焊接变形主要以平面外变形为主,变形模式为马鞍形,最大变形值发生在试板中部远离焊缝中心的外边缘。
[Abstract]:In order to study the distribution of residual stress and deformation field in butt joint of steel bridge, a three-dimensional finite element model of 16mm thick Q345qD steel plate multilayer butt welding was established based on Abaqus software, and the residual stress and deformation field were simulated and predicted. The simulation results are tested and verified. The results show that the numerical simulation results of welding residual stress and deformation are in good agreement with the experimental data. The longitudinal welding residual stress of butt joint is distributed in tensile compression state perpendicular to the weld direction. The maximum value of the residual stress is located in the heat-affected zone, about 350MPa, which is close to the yield strength of the material, and the longitudinal residual stress is tensile stress within the range of 60mm from the center of the weld. The stress level of transverse welding residual stress is relatively low, and the maximum value is about 100 MPA. The welding deformation is mainly out-of-plane deformation, and the deformation mode is saddle-shaped, and the maximum deformation occurs at the outer edge of the middle part of the plate far from the center of the weld.
【作者单位】：西南交通大学土木工程学院;西南科技大学土木工程与建筑学院;
【基金】：国家自然科学基金(51378430) 2016年西南交通大学博士研究生创新基金(13017021)
【分类号】：TG404

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