Investigation of Polycarbonate Sheet Thermoforming Process
Date Issued
2011
Date
2011
Author(s)
Chang, Yao-Wen
Abstract
Although thermoforming has been used for many years, it still relies mostly on trial-and-error methods. The thermoforming of polycarbonate, results in defects or failure due to forming more frequently than other thermoplastics. The reason for this is the high toughness of polycarbonate and the relatively high operating temperature required to process it. Improving the techniques involved in controlling the manufacture parameters of these materials relies on an understanding of the fundamental behavior of polycarbonates at elevated temperatures.
The aim of this study is improving the polycarbonate thermoforming techniques. The thermotensile experiments and regression analysis are conducted to characterize the mechanical behavior of polycarbonate under elevated temperature. According to the results of axisymmetric vacuum-forming experiments and numerical simulation, a comprehensive hyperelastic constitutive model of polycarbonate is constructed and applied in forming prediction. The ideal manufacture parameters are also provided through the above results. At the end of study, the polycarbonate thermoforming technique are applied in manufacturing the canopy and lampshades of hybrid motorcycle.
Subjects
Polycarbonate
thermoforming
hyperelastic
finite element analysis
thermotensile test
axisymmetric
vacuum-forming
Type
thesis
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