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Open AccessArticle

Numerical Simulation and Experimental Investigation of the Viscoelastic Heating Mechanism in Ultrasonic Plasticizing of Amorphous Polymers for Micro Injection Molding

1
State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China
2
Institute of Polymer Composites, Hamburg University of Technology, Denickestrasse 15, Hamburg D-21073, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Martin Kröger
Polymers 2016, 8(5), 199; https://doi.org/10.3390/polym8050199
Received: 24 March 2016 / Revised: 25 April 2016 / Accepted: 10 May 2016 / Published: 17 May 2016
(This article belongs to the Special Issue Computational Modeling and Simulation in Polymer)
Ultrasonic plasticizing of polymers for micro-injection molding has been proposed and studied for its unique potential in materials and energy-saving. In our previous work, we have demonstrated the characteristics of the interfacial friction heating mechanism in ultrasonic plasticizing of polymer granulates. In this paper, the other important heating mechanism in ultrasonic plasticizing, i.e., viscoelastic heating for amorphous polymer, was studied by both theoretical modeling and experimentation. The influence mechanism of several parameters, such as the initial temperature of the polymer, the ultrasonic frequency, and the ultrasonic amplitude, was investigated. The results from both numerical simulation and experimentation indicate that the heat generation rate of viscoelastic heating can be significantly influenced by the initial temperature of polymer. The glass transition temperature was found to be a significant shifting point in viscoelastic heating. The heat generation rate is relatively low at the beginning and can have a steep increase after reaching glass transition temperature. In comparison with the ultrasonic frequency, the ultrasonic amplitude has much greater influence on the heat generation rate. In light of the quantitative difference in the viscoelastic heating rate, the limitation of the numerical simulation was discussed in the aspect of the assumptions and the applied mathematical models. View Full-Text
Keywords: micro injection molding; ultrasonic plasticizing; viscoelastic heating; numerical simulation micro injection molding; ultrasonic plasticizing; viscoelastic heating; numerical simulation
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MDPI and ACS Style

Jiang, B.; Peng, H.; Wu, W.; Jia, Y.; Zhang, Y. Numerical Simulation and Experimental Investigation of the Viscoelastic Heating Mechanism in Ultrasonic Plasticizing of Amorphous Polymers for Micro Injection Molding. Polymers 2016, 8, 199.

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