作业帮英语翻译This large temperature gradient from the melting point t
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英语翻译
This large temperature gradient from the melting point to room temperature,as well as phase changes occurring in solidifying metal leads to residual stresses retained in spot-welded joint.Residual stresses significantly affect stress corrosion cracking,hydrogen-induced cracking,and fatigue strength.Regardless of the loading conditions on spot-welded joints,tensile residual stress deteriorates the fatigue strength and the quality of the joint (Ref 2,3).
Measuring residual stress is a time-consuming and challenging process (Ref 4).Therefore,there has been an increase in the use of numerical simulation methods for estimating residual stresses in welded joints (Ref 2).However,previous numerical simulations on RSW have been mainly based on temperature distribution,nugget growth,and electrode design,but the residual stresses have been rarely considered in RSW simulations.
This large temperature gradient from the melting point to room temperature,as well as phase changes occurring in solidifying metal leads to residual stresses retained in spot-welded joint.Residual stresses significantly affect stress corrosion cracking,hydrogen-induced cracking,and fatigue strength.Regardless of the loading conditions on spot-welded joints,tensile residual stress deteriorates the fatigue strength and the quality of the joint (Ref 2,3).
Measuring residual stress is a time-consuming and challenging process (Ref 4).Therefore,there has been an increase in the use of numerical simulation methods for estimating residual stresses in welded joints (Ref 2).However,previous numerical simulations on RSW have been mainly based on temperature distribution,nugget growth,and electrode design,but the residual stresses have been rarely considered in RSW simulations.
从熔点到室温的这一大的温度梯度,以及在凝固金属中发生的相的变化导致了保持在点焊接点处的残余应力.残余应力显著影响应力腐蚀开裂、氢致开裂、以及疲劳强度.不管对点焊接点的载荷条件如何,拉伸残余应力使疲劳强度和接点的质量劣化（参考文献2,3）.测定残余应力是一项耗时且有挑战性的过程（参考文献4）.因此,一直在增加采用数值模拟方法来估计焊接接点的残余应力（参考文献2）.然而,以前对RSW（电阻点焊）的数值仿真一直主要基于温度分布、熔核生长和电极设计,但残余应力在RSW的仿真中一直很少得到考虑.
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