Application of a Rate Dependent Model on a UD NCF Carbon/Epoxy Composite

Abstract

To support the modelling of composites under rapid transient loading, e.g. impact, crash, and vibrations, a computational multiscale constitutive model has been developed for the progressive failure of unidirectional carbon fibre composites. The model is computationally efficient and captures anticipated failure modes to an acceptable accuracy. Computational homogenization and micromechanics are utilized in the modelling at the ply scale. A major focus is to predict the strain rate dependent nonlinear constitutive behaviour of unidirectional composite plies [1]. The fibres are assumed transversely isotropic, whereas the polymer is viscoelastic–viscoplastic, including a pressure dependent strength. Degradation of the polymer matrix is described by a recently developed continuum damage mechanics approach [2]. The model has been successfully implemented as a VUMAT subroutine in Abaqus/Explicit. Figure 1 shows FE simulation of strain localization as compared to experimental results of IM7/8552 in dynamic off-axis compression [3]. Reasonable correlation was found between the measured and numerically predicted results.