Abstract
Examination of modeling for computer simulation of thermoforming process by non-linear dynamic structual analysis code. The defomation patterns and the thickness distribution of the products in a thermoforming process with blowing, plug-assist stretching and vacuuming were simulated. A simple material model (Maxwell viscoelastic model) was employed in this simulation. The viscoelastic behavior and the effect of the temperature distribution of the specimen sheet in the observed themoforming process were taken into consideration in the finite element analysis. And the treatment of sliding and impact along interfaces between a sheet and dies was taken into consideration. In conclusion , it is confirmed that consideration of friction between sheet and dies and the initial thickness distribution of drawdown effect are more important.
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