A crystal plasticity phenomenological model to capture the non-linear shear response of carbon fibre reinforced composites

A hardening response is often observed for shear-dominated large deformation of Carbon Fibre Reinforced Plastics (CFRP). This non-linear modelled by fitting a strain law against experimental stress-strain curves. Inspired crystal plasticity framework, phenomenological model developed to capture matrix shearing and fibre rotation CFRP under finite strain. first verified simple shear transverse compression tests, followed comprehensive validations measured responses unidirectional (UD) cross-ply composite laminates subjected quasi-static loading. The analytical element predictions lamina loading confirm that the initial yielding governed yield strength matrix, while behaviour dependent on modulus carbon fibres. accurately predicts off-axis without need an empirical curve-fitted law.