摘要
采用数值仿真和试验研究了超声波塑料焊接过程中不同特征温度段的产热机理.利用有限元法(FEM)对聚甲基丙烯酸甲酯(PMMA)材料超声波焊接过程中的粘弹性热以及摩擦热进行了计算.基于计算结果,提出了摩擦热是焊接过程的启动热源,粘弹热是焊接过程主要热源的观点.制备了相应的试件并搭建测温系统对焊接过程进行测温试验,试验结果验证了仿真结果的正确性.对焊接过程中的产热机理给出了更清晰的解释,有助于超声波塑料焊接技术进一步在精密焊接领域的应用.
Heat production mechanisms in temperature ranges below and above Tg(glass transition temperature) of thermoplastic components were studied by numerical simulation and experiment.The viscoelastic heat and facial friction heat in ultrasonic welding of PMMA(polymethyl methacrylate) were numerically calculated by FEM(Finite Element Method).Temperature was measured to verify the simulation results.Results of simulation and experiment agree well with each other,which indicate that the facial friction heat is the initial heat source in ultrasonic welding process.Heat conduction effect chain-reactingly activates the generation of the viscoelastic heat when temperature reaches Tg of the base metal.And the viscoelastic heat provides most required heat during welding.The present study gives a more clear understanding of heat production mechanisms in ultrasonic welding.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2010年第11期29-32,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(50775024
50975037)
新世纪优秀人才支持计划资助项目(NCET-06-0279)
关键词
超声波焊接
粘弹性热
有限元
ultrasonic welding
viscoelastic heat
finite element method
