Abstract
We propose a rheology-based viscoelastic-viscoplastic constitutive model that takes into account the self-heating phenomenon of thermoplastic resin. Different kinds of hyperelastic constitutive laws are used for the viscoelastic and viscopelastic rheological elements. A generalized Maxwell model is used to characterize the viscoelastic material behavior at small or moderate strain regime, while a finite strain viscoplastic model is employed to transient creep deformations due to frictional resistance of molecular chains. Also, back stress is introduced to represent the hardening due to orientation of molecular chains. After verifying the fundamental performance of the proposed model in reproducing typical material behavior of resin, we carry out several numerical analyses for simple structures to demonstrate its applicability for practical use.
