扫描顺序对CFRTP/TC4激光连接应力场和变形的影响

Effect of Scanning Order on Stress Field and Deformation of CFRTP/TC4 Laser Joining Process

为了研究扫描顺序对碳纤维增强热塑性复合材料(CFRTP)下板与TC4钛合金上板双道激光搭接连接后构件残余应力及变形的影响,首先建立了由高斯面热源和指数旋转抛物线体热源组成的复合热源模型,并验证了该模型的合理性。随后,模拟双道激光连接过程的等效应力和变形的演化规律,以研究不同顺序下残余应力和变形的分布情况,并将残余应力的模拟结果与试验结果进行对比,说明了模拟结果的准确性。结果表明,不同激光扫描顺序下的残余应力分布有所不同,当激光扫描顺序为从右向左时,结构件的残余应力的分布较均匀,应力峰值较小。同时,扫描顺序的改变对连接结构残余变形几乎无影响。因此,采用从右向左的扫描顺序有利于CFRTP/TC4钛合金双道激光连接。

In order to study the effect of scanning order on the stress field and deformation of CFRTP/TC4 dual-channel laser lap joining process with TC4 as upper plate,the composite heat source model of Gaussian surface heat source and exponential rotating parabola heat source was established,and the rationality of the model was verified.The equivalent stress field and deformation of dual-channel laser joining process between CFRTP and TC4 titanium alloy were simulated to study the distribution of residual stress and deformation in different orders,and the simulation results of residual stress were compared with the experimental results,which shows the accuracy of the simulation results.The results indicate that the distribution of residual stress is different in different laser scanning order.When the laser scanning order is from right to left,the distribution of residual stress is more uniform and the peak value of stress is smaller.At the same time,the change of the scanning order has little effect on the residual deformation of the joint structure.Therefore,the right-to-left scanning order is more favorable for the dual-channel laser joining of CFRTP/TC4 titanium alloy.