针对0.1 mm厚医用聚对苯二甲酸乙二酯(PET)薄膜与0.1 mm厚薄钛板之间的激光透射连接试验,利用商业化软件ANSYS,使用APDL语言编程实现超高斯型热源的动态加载,建立了一个三维热传导模型,使用有限元法求得连接过程中温度场的分布,得到温度场达到准稳态的时间,分析加工速度和激光器功率等工艺参数对连接质量的影响,并计算出不同工艺参数下的连接宽度。通过对PET薄膜与薄钛板的激光透射连接试验接头宽度的测量值进行对比,两者趋势基本吻合,说明该有限元模型是可靠的。

0.1-mm-thick PET films and 0.1-mm-thick titanium are joint using laser transmission joining technology. A 3D thermal model based on the finite element theory to simulate the temperature field on laser transmission joining of PET and titanium is established. With the ANSYS parametric design language (APDL) a moving super Gaussian distributed heat source is applied,and the distribution of the temperature field and the time to achieve quasi-steady-state temperature field are gained. Effect of process parameters,including laser power and scanning welding,on the joinging result is investigated,and the calculated joint width is obtained. Experimental data for joint width is collected. Very good agreement is achieved between the calculated values and the measured values. It shows that the model is reliable.