Finite strain viscoelastic-viscoplastic modeling of polymers and application to composites

Abstract eng:
A finite strain thermodynamically-based constitutive model coupling viscoelasticity (VE) and viscoplasticity (VP) is proposed for neat polymers. One version is suitable for Epoxy resins and another for thermoplastic polymers. A multiplicative decomposition of the total deformation gradient into VE and VP parts is assumed. Constitutive equations satisfying Clausius-Duhem’s non-negative dissipation condition are derived. Unit cell finite element simulations for continuous fiber reinforced composites with a VE-VP Epoxy matrix are carried out. Numerical simulations are presented and discussed for both neat polymers and composites.

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