A strain-gradient formulation for fiber reinforced polymers: hybrid phase-field model for porous-ductile fracture

A novel numerical approach to analyze the mechanical behavior within composite materials including inelastic regime up final failure is presented. Therefore, a second-gradient theory combined with phase-field methods fracture. In particular, we assume that polymeric matrix material undergoes ductile fracture, whereas continuously embedded fibers undergo brittle fracture as it typical e.g. for roving glass reinforced thermoplastics. hybrid developed and applied along modified Gurson-Tvergaard-Needelman GTN-type plasticity model accounting temperature-dependent growth of voids on microscale. The response arising microstructure woven fabric gives rise additional higher-order terms, representing homogenized bending contributions fibers. Eventually, series tests conducted this physically comprehensive multifield formulation investigate different kinds sequences long fiber polymers.