Browsing by Author "Hung, C"

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Finite element analysis of hot embossing of polymer optical sheet
(2003)
Lin, CR
;
Chen, RH
;
Hung, C
;
機械工程學系
;
Department of Mechanical Engineering
Finite element simulation of the hot embossing process used in manufacturing polymer optical components was performed using MARC code. This research focuses mainly on predicting contractive deformation during the cooling procedure in making a polymer optical sheet. A nonlinear viscoelastic model of temperature and pressure-dependent material properties, exhibiting creep, was used to capture the properties of amorphous polymer material. The simulation of contractive deformation confirms with the results of corresponding experiments, indicating that this finite element model can be used to simulate the hot embossing of a polymer with acceptable results.
The characterisation and finite-element analysis of a polymer under hot pressing
(2002)
Lin, CR
;
Chen, RH
;
Hung, C
;
機械工程學系
;
Department of Mechanical Engineering
Finite-element simulation of the hot pressing process has been performed using ABAQUS. The viscoelastic polymer (polymethyl methacrylate) used in this study has mechanical properties that depend on the temperature and working pressure. Based on the nonlinear viscoelastic model, the polymer material behaviour is simulated successfully with the data obtained from material tests. Simulation results conform to related experiments, indicating that the approach can accurately predict pressure distribution within a polymer hot pressing.