ABSTRACT A computational methodology for identifying the viscoelastic material parameters for thermoplastic unidirectional (UD) composites from bending and in‐plane shear tests in molten state is presented, using a hypo‐viscoelastic constitutive model. The key innovation lies in the numerical identification of in‐plane and out‐of‐plane material parameters from experimental data (bias extension and bending tests) through a reverse engineering approach employing an optimization algorithm and finite element (FE) simulations. The identified material parameters successfully reproduce the experimental bending and bias extension response for different loading rates.
Wintiba et al. (Thu,) studied this question.