Material characterization of polycarbonate near glass transition temperature
Journal
Journal of the Chinese Institute of Engineers, Series A/Chung-kuo Kung Ch'eng Hsuch K'an
Journal Volume
35
Journal Issue
8
Pages
967-978
Date Issued
2012
Author(s)
Abstract
The aim of this study is to identify the material characteristics of polycarbonate (PC) at operating temperature during the thermoforming. For this purpose, a series of uniaxial thermotensile tests and regression analyses were carried out in this study. The thermotensile experiments were conducted under a wide range of elevated temperatures and elongation rates, to demonstrate the temperature and strain rate effects on PC. Based on experimental results, we confirmed the ideal manufacturing parameters for the process of thermoforming PC. Following the experiments, the applicability of general hyperelastic models was examined and compared through regression analysis. The results of this analysis indicate that only a limited number of hyperelastic models adequately describe the mechanical behavior of PC at its operating temperature. By combining the results of experiments and analyses, a more comprehensive and proper description of the material behavior of PC at operating temperatures has been proposed. Criteria for evaluating material characterization were also suggested. The results of this study could be applied to improve the simulation of PC thermoforming.
Type
journal article