考虑相变影响的电阻点焊数字模拟  

Numerical simulation of resistance spot welding considering phase transition effect

作　　者：易荣涛 赵大伟[1] 王元勋[1] 

机构地区：[1]华中科技大学工程结构分析与安全评定湖北省重点实验室,武汉430074

出　　处：《焊接学报》2013年第10期71-74,116-117,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(11072083)

摘　　要：热膨胀作用于焊接整个过程,考虑相变对线膨胀系数的影响,建立了考虑相变影响的电阻点焊二维轴对称有限元数值分析模型.以双相高强度钢DP600为研究对象,考虑相变潜热的影响,得到焊接过程温度场分布结果.利用热弹塑性理论和线性混合法则,考虑相变对线膨胀系数的影响,对双相钢电阻点焊应力场及工件焊接变形进行了分析研究.结果表明,考虑相变对线膨胀系数的影响,计算分析结果更接近实际.The thermal expansion works in the whole welding process. Taking into account the phase transition on the thermal expansion coefficient,a two-dimensional axisymmetric finite element numerical analysis model of the resistance spot welding considering the effects of phase transition was performed. Then based on the thermal results considering the impact of latent heat,the resistance spot welding stress field and deformation of the weldment of dual-phase steel DP600 were analyzed with the thermal elastic-plastic theory and the linear rule of mixtures taking into account of the phase transition. The results show that the analysis result is closer to the actual situation by considering the phase transition on the thermal expansion coefficient.

关 键 词：双相高强度钢 相变 数值模拟 应力场 变形 

分 类 号：TG115.28[金属学及工艺—物理冶金]