| 超声波塑料焊接粘弹性热的仿真计算 |
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| 引用本文： | 张振强,张宗波,罗怡,王晓东,王立鼎.超声波塑料焊接粘弹性热的仿真计算[J].焊接学报,2009,30(9):97-100. |
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| 作者姓名： | 张振强 张宗波 罗怡 王晓东 王立鼎 |
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| 作者单位： | 1. 大连理工大学精密与特种加工教育部重点实验室,辽宁大连,116024
2. 辽宁省微纳米技术及系统重点实验室,辽宁大连,116024 |
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| 基金项目： | 国家自然科学基金，新世纪优秀人才支持计划资助项目 |
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| 摘 要： | 粘弹性热是超声波塑料焊接的主要热源之一.针对目前已有方法在计算粘弹性热时不能很好的体现聚合物材料的动态粘弹性而产生较大误差的缺点,首先利用静态松弛模量和"时一温等效性原理"对材料的动态粘弹性进行表征,该方法把动态模量表示成温度和频率的函数,避免了动态模量这一复杂过程.提出了一种用于超声波焊接过程中粘弹性热计算的策略,并对周期载荷作用下PMMA二维模型的粘弹产热过程进行了有限元仿真.结果表明,所得的温度变化趋势与文献中的试验测量结果基本相符.
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| 关 键 词： | 超声波塑料焊接 动态粘弹性 粘弹性热 有限元 |
| 收稿时间： | 2008/6/20 0:00:00 |
Simulation of viscoelastic heat during ultrasonic welding of thermoplastics |
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| ZHANG Zhenqiang,ZHANG Zongbo,LUO Yi,WANG Xiaodong and WANG Liding.Simulation of viscoelastic heat during ultrasonic welding of thermoplastics[J].Transactions of The China Welding Institution,2009,30(9):97-100. |
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| Authors: | ZHANG Zhenqiang ZHANG Zongbo LUO Yi WANG Xiaodong and WANG Liding |
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| Affiliation: | Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, Liaoning, China,Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, Liaoning, China,Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, Liaoning, China;Key Laboratory for Micro/Nano Technology and System of Liaoning Province, Dalian 116024, Liaoning, China,Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, Liaoning, China;Key Laboratory for Micro/Nano Technology and System of Liaoning Province, Dalian 116024, Liaoning, China and Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, Liaoning, China;Key Laboratory for Micro/Nano Technology and System of Liaoning Province, Dalian 116024, Liaoning, China |
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| Abstract: | Viscoelastic heat is one of the main heat sources during ultrasonic welding of thermoplastics.Unfortunately the present works could not definitely take into account the dynamic viscoelasticity of thermoplastics.In this paper a simplified method was proposed to characterize dynamic viscoelasticity based on static relaxation modulus and TTEP(time-temperature equivalent principle).The method could represent dynamic modulus as the function of temperature and frequency, and avoids calculating dynamic modulus of high frequency by shifting and extrapolating the dynamic modulus of lower frequency from experiments.With the method mentioned above, a strategy was put forward to simulate the viscoelastic heat of PMMA(polymethyl methacrylate) under periodic load using FEM(finite element method).The calculated temperature shows a similar tendency as tested results in other literatures. |
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| Keywords: | ultrasonic welding dynamic viscoelasticity viscoelastic heat finite element method |
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