焊缝屈服强度对SM490A钢焊接残余应力预测精度的影响

发布时间：2018-05-18 11:59

本文选题：焊接残余应力 + 有限元法　；参考：《焊接学报》2015年07期

【摘要】：基于有限元分析软件MSC.Marc,开发了用于模拟焊接温度场、焊接应力场和应变场的热-弹-塑性有限元计算方法.以低合金高强度钢SM490A为研究对象,采用移动热源和实测得到的YGT50焊缝与母材高温热物理性能和力学性能数据,数值模拟了SM490A钢单道堆焊接头的焊接残余应力.并重点讨论了高组配接头焊缝的屈服强度对焊接残余应力的峰值和分布的影响.结果表明,对于高组配接头,当把焊缝和母材不加区分(等强匹配),两者都采用母材的屈服强度来计算焊接残余应力时,得到的焊缝处纵向残余应力明显低于实测值;当分别采用焊缝和母材的屈服强度来计算焊接残余应力时,得到的焊缝处纵向残余应力与试验值非常接近.
[Abstract]:Based on the finite element analysis software MSC.Marc, a thermal-elastic-plastic finite element method is developed to simulate the welding temperature field, welding stress field and strain field. The welding residual stress of single-pass surfacing joint of low alloy high strength steel (SM490A) was numerically simulated by using moving heat source and measured data of thermal physical properties and mechanical properties of YGT50 weld and base metal at high temperature. The effect of weld yield strength on the peak value and distribution of welding residual stress was discussed. The results show that the longitudinal residual stress of the weld is obviously lower than the measured value when the weld and the base metal are not distinguished (equal strength matching, both of which use the yield strength of the base metal to calculate the welding residual stress). When the welding residual stress is calculated by the yield strength of the weld and the base metal, the longitudinal residual stress of the weld is very close to the experimental value.
【作者单位】：重庆大学材料科学与工程学院;
【基金】：国家自然科学基金资助项目(51275544)
【分类号】：TG404

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