Macroscale modelling of 3D-woven composites: Elasto-plasticity and progressive damage

There is a growing need across multiple industries for lightweight materials with improved material performance and reduced manufacturing costs. Composites 3D-woven reinforcement could help fill this need. Their use however, requires the development of computationally efficient industrially applicable models to predict their non-linear behaviour. This work proposes macroscale elasto-plasticity damage model capture experimentally observed inelastic strains stiffness reductions. The general, thermodynamically consistent allows various phenomena be added calibrated in modular fashion depending on loading direction. Further it simplified parameter identification routine which hardening laws are identified directly from experimental curves without complex calibration routines. In order demonstrate applicability proposed model, focus given predicting response 3D glass fibre reinforced epoxy system. parameters based uniaxial tensile in-plane shear unloading cycles. validated against an off-axis test cycles shows good agreement result.