焊缝屈服强度对SM490A钢焊接残余应力预测精度的影响

叶延洪; 孙加民; 蔡建鹏; 邓德安

焊缝屈服强度对SM490A钢焊接残余应力预测精度的影响

重庆大学材料科学与工程学院, 重庆 400044

基金项目: 国家自然科学基金资助项目(51275544)

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出版历程
- 收稿日期: 2013-12-18

Influence of yield strength of weld metal on prediction accuracy of welding residual stress in SM490A steel joint

School of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

摘要

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.
- 焊接残余应力 /
- 有限元法 /
- 数值模拟 /
- 屈服强度
Abstract: Based the commercial software MSC.Marc, a thermal elastic plastic finite element method was developed to simulate welding temperature and residual stress fields. By using moving heat source and the temperature-dependent thermo-physical and mechanical properties of the base metal (SM490A) and weld metal (YGT50), the welding residual stress distribution in a single-pass bead-on joint was calculated by means of the developed computational approach. Meanwhile, the influence of the weld yield strength on the peak and distribution of welding residual stresses was discussed. The results show that the yield strength of weld metal has a significant influence on the longitudinal residual stress in overmatched joint. When the yield strength of weld metal was assumed to be the same with that of base metal, the finite element model will underestimate the welding residual stress in the weld zone. If the yield strengths of weld metal measured by experiment were used in fusion zone, the predictions of longitudinal residual stress agrees well with that of experiments.
- welding residual stress /
- finite element method /
- numerical simulation /
- yield strength

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参考文献(10)

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