Modelling damage in multidirectional laminates subjected to multi-axial loading: Ply thickness effects and model assessment

A meso-scale damage modelling framework for composite laminates is assessed against multi-axial experimental data obtained from specimens subjected to combined tension/compression and shear loading using a modified Arcan fixture (MAF). Two made unidirectional carbon fibre-reinforced epoxy plies of different thickness are considered investigate the ply effect on behaviour open-hole specimens. Intra-laminar predicted continuum model with fibre-aligned mesh, while cohesive zones used account inter-laminar damage. The specimen strength mean relative error 15% across all investigated lay-up configurations, maps show encouraging agreement full-field measurements digital image correlation (DIC). However, assessment reveals limitations assumption small strains rotations in formulation that lead spurious shear-dominated modes.