Numerical Simulations of Friction Stir Welding Process and Subsequent Post Weld Cold Rolling Process
Numerical Simulations of Friction Stir Welding Process and Subsequent Post Weld Cold Rolling Process
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搅拌摩擦焊过程及后续焊后冷轧过程的数值模拟
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Q. Shi
中科院分区：
文献类型：
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作者：
Y. Sun;Y. Zang;Q. Shi
首先进行顺序耦合三维热机械分析来模拟铝合金搅拌摩擦焊（FSW）。热分析中，模型包括自适应热源、工件与夹具之间、工件与背板之间的接触传热等；力学分析中，模型涉及工件与夹具之间、工件与背板之间的接触相互作用、工具的机械载荷等。模拟结果表明，纵向残余应力关于焊缝中心线不对称； FSW工艺的纵向残余应力大小低于熔焊工艺。基于FSW工艺的模拟结果，进行三维弹塑性分析来模拟轧制过程，模拟结果表明，轧制过程不仅使纵向残余拉力显着减小，而且使纵向残余应力的符号发生逆转。
A sequential coupled three-dimensional thermo-mechanical analysis was conducted first to simulate friction stir welding (FSW) of aluminum alloy. In thermal analysis, the model included adaptive heat source, contact heat transfer both between work piece and clamps and between work piece and backing board etc; in the mechanical analysis, the model involved contact interaction both between work piece and clamps and between work piece and backing board, mechanical load of tool etc. The simulation results indicate that the longitudinal residual stress is unsymmetrical about weld centerline; the magnitude of longitudinal residual stress for FSW process is lower than that for fusion welding process. Based on simulated results of FSW process, a three-dimensional elastic-plastic analysis was then carried out to simulate rolling process, the simulation result show that rolling process not only causes a marked reduction in the longitudinal tensile residual but also reverse the sign of the longitudinal residual stress.