摘要
以聚碳酸酯为研究对象,使用铝膜作为中间传导层,选用高斯面热源模型,建立了金属薄膜热应力理论模型和有限元模型,应用COMSOL软件对含有铝膜中间层的聚碳酸酯激光透射焊接过程进行数值模拟.首先分析焊接过程中焊缝不同位置处的形变和不同方向的体应变张量.然后根据模拟出的等效应力云图和主应力云图,分析焊接过程中的应力大小及分布.结果表明,离激光中心越近,体应变张量越大,形变越大;铝膜与聚碳酸酯间隙交界处等效应力最大,并且中心点应力随时间先增大后减小,最后趋于稳定.运用拉伸机进行拉伸试验,将试验结果与模拟结果进行对比,发现铝膜与聚碳酸酯间隙交界处产生脆性断裂,断裂处与应力集中处相同,结果表明两者之间有良好的一致性.
This article takes polycarbonate as the research object,aluminum film is used as the intermediate conductive layer,Gaussian surface heat source model is selected,and the metal film thermal stress theoretical model and finite element model are established.The COMSOL software is used to analyze the polycarbonate laser containing the aluminum film intermediate layer.The transmission welding process is numerically simulated.First,the deformation at different positions and the volume strain tensor in different directions are analyzed.Then,according to the simulated equivalent stress cloud diagram and principal stress cloud diagram,the magnitude and distribution of stress in the welding process are analyzed.The results show that the closer to the laser center,the greater the volume strain tensor and the greater the deformation;the equivalent stress at the junction of the aluminum film and the polycarbonate gap is the largest,and the stress at the center point first increases and then decreases with time,and finally tends to stable.The tensile test was carried out with a tensile machine,and the experimental results were compared with the simulation results.It was found that brittle fracture occurred at the junction of the aluminum film and the polycarbonate gap,and the fracture was the same as the stress concentration.The results showed that there is good consistence between them.
作者
丁宁
钟红强
黄嘉沛
王传洋
DING Ning;ZHONG Hongqiang;HUANG Jiapei;WANG Chuanyang(Soochow University,Suzhou 215021,China)
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2021年第2期46-50,55,I0004,共7页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(51475315,52075354)
江苏省高校自然科学基金资助项目(17KJB460013).
关键词
激光透射焊接
铝膜中间层
温度场
应变
应力场
laser transmission welding
aluminum film intermediate layer
temperature field
strain
stress field
