| Issue |
MATEC Web Conf.
Volume 264, 2019
2nd International Conference on Composite Material, Polymer Science and Engineering (CMPSE2018)
|
|
|---|---|---|
| Article Number | 03005 | |
| Number of page(s) | 5 | |
| Section | Product Manufacturing (Recycle, Material Process, Machining) | |
| DOI | https://doi.org/10.1051/matecconf/201926403005 | |
| Published online | 30 January 2019 | |
Simplified shear relaxation modulus function of HDPE for FE simulation in extrusion blowing process
Department of Mechanical Engineering, Faculty of Engineering, Kasetsart University,
Bangkok,
10900,
Thailand
a Corresponding author: s.natwee@gmail.com
Attempts to apply finite element analysis for simulation of the final geometry from extrusion blowing process have been studied. One of the accuracies for the prediction is a suitable mathematical model of the thermoplastic during the process. Visco-elastic model is found to be a suitable model by many researchers. This paper simplified the shear relaxation modulus function (SRMF) which characterizes the high-density polyethylene in molten state. Instead of the series of five exponential functions previously used, our simplified-SRMF consists of one power function of temperature and time. The deviation of our model from Williams-Landel-Ferry model with KBKZ constants, between the temperature of 140°C to 200°C and time from 0 to 10 sec, is 9.3706%. When simulated on a bottle, our model has the final bottle thickness and time deviation from WLF-KBKZ model by 0.19622% and 3.07362% respectively.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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