Abstract
It is important to have an accurate description of the mechanical behavior of polymer when predicting the warpage of injection-molded part. The viscoplastic model for polymer was developed based on the classical Chaboche viscoplastic model for polycrystalline metals. The cyclic tensile test was performed at three levels of strain rate and six levels of temperature. The ratio between Young’s modulus in the unloading and loading path was described as function of total strain. The warpage prediction for a plaque has been conducted successfully. The simulated deflection has a good agreement with the measured one by the viscoplastic model for polymer. It also exhibits a significant improvement compared with the simulated one by viscoplastic model for polycrystalline metals.
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