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ZHANG Zhenqiang, ZHANG Zongbo, LUO Yi, WANG Xiaodong, WANG Liding. Simulation of viscoelastic heat during ultrasonic welding of thermoplastics[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2009, (9): 97-100.
Citation: ZHANG Zhenqiang, ZHANG Zongbo, LUO Yi, WANG Xiaodong, WANG Liding. Simulation of viscoelastic heat during ultrasonic welding of thermoplastics[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2009, (9): 97-100.
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Simulation of viscoelastic heat during ultrasonic welding of thermoplastics

  • 1.

    Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, Liaoning, China

  • 2.

    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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  • Received Date: June 19, 2008
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  • 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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