Simulation and experimental validation of shear deformation and strength of textile-reinforced composites

A micro-meso-scale model is proposed to predict shear deformation and strength of textile-reinforced composites, considering shear non-linearity, strain-rate dependent elastic and visco-plastic behavior, and 3D geometrical nonuniformity of the reinforcement. The matrix and fibers are combined using bridging-model micromechanics into composite tows. Combined with the geometrical characteristics of the reinforcement, a composite with orthotropic rate-dependent visco-plastic behavior is obtained. A damage model detects damage in the composite tows and interstitial matrix, introducing stiffness reduction and stress redistribution. The model constants are measured by experiments on neat epoxy matrix and unidirectional glass/epoxy specimens. Model predictions are validated with independent experiments.