摘要
316L奥氏体不锈钢具有较强的应变硬化特征,建立合适的硬化模型可以更加准确地预测焊接残余应力.建立一种新型的非线性混合硬化模型,基于SYSWELD软件,采用间接耦合的三维热弹塑性有限元法模拟316L奥氏体不锈钢三道槽焊缝的残余应力.结果表明,材料的硬化模型对焊接残余应力的预测具有重要的影响,随着热循环次数的增加,硬化模型的影响越明显;与实际测量结果比较,随动硬化模型低估了焊接残余应力,等向硬化模型高估了残余应力,采用非线性混合硬化模型可以更加准确地模拟焊接残余应力.
316L austenitic stainless steel has a strong strain hardening character. It can accurately predict the welding residual stresses to select a suitable hardening model. In this study,a new nonlinear mixed hardening model was developed.An uncoupled 3D thermal and mechanical analysis was carried out by using the software code SYSWELD to simulate the welding residual stress in a 3-pass slot weld. The results show that material hardening model has an important influence on the predicted residual stress. The effect of hardening model is more obvious with the increase of thermal cycles. Compared with the measured residual stress,kinematic hardening model underestimates the welding residual stress,and isotropic hardening model overestimates the residual stress. An excellent agreement with the measured data can be obtained to use nonlinear mixed hardening model to simulate the welding residual stresses.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2014年第3期97-100,118,共4页
Transactions of The China Welding Institution
关键词
焊接残余应力
硬化模型
数值模拟
welding residual stress
hardening model
numerical simulation
