应用激光, 2018, 38 (1): 58, 网络出版: 2018-05-03   

基于接触热阻的聚碳酸酯激光透射焊接温度场分析

Temperature Field Analysis of Laser Transmission Welding of Polycarbonate Based on Thermal Contact Resistance
作者单位
苏州大学机电工程学院, 江苏 苏州 215021
摘要
为了研究实际接触条件对塑料激光透射焊接温度场分布的影响, 建立了基于体热源和考虑接触热阻的热传递模型的三维瞬态有限元热分析模型, 采用C语言编写的APDL子程序实现体热源的动态加载, 考虑温度对材料的影响, 使得温度场分布更符合实际状况。采用该模型对PC塑料激光透射焊接过程进行模拟, 分析不同接触热阻和功率下温度场的分布, 并与不考虑接触热阻的体热源模型模拟的结果、试验结果进行对比。结果表明, 考虑接触热阻的体热源模型模拟得到的焊缝分布更符合实际情况, 表明该模型可以较好的表征接触热阻对透射焊接的影响, 并且可以准确的预测焊缝的尺寸。
Abstract
In order to study the influence of actual contact conditions on the temperature field distribution of plastic laser transmission welding, a three-dimensional transient finite element analysis thermal model of polycarbonate(PC)was established based on volumetric heat source and heat transfer model considering thermal contact resistance. Moving volumetric heat source was implemented by APDL subroutine written in C language, considering the effect of temperature on the material, makes the temperature distribution more in line with the actual situation. The model was used to simulate laser welding process of PC plastic. The distribution of temperature field under different thermal contact resistance and power was analyzed. The simulated results are compared with that of heat source model without thermal contact resistance and experimental results, respectively. The results show that the weld distribution simulated by the volumetric heat source model considering the contact thermal resistance is more in line with the actual situation, the model can better characterize the influence of thermal contact resistance on the transmission welding and can predict the size of the weld accurately.

郝云, 王传洋, 刘海华, 姜宁. 基于接触热阻的聚碳酸酯激光透射焊接温度场分析[J]. 应用激光, 2018, 38(1): 58. Hao Yun, Wang Chuanyang, Liu Haihua, Jiang Ning. Temperature Field Analysis of Laser Transmission Welding of Polycarbonate Based on Thermal Contact Resistance[J]. APPLIED LASER, 2018, 38(1): 58.

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