Multi-scale Analysis of LVI and CAI Behaviors of Plain Woven Carbon-fiber-reinforced Composites

A multi-scale modeling strategy was proposed to investigate LVI and CAI behaviors of plain woven carbon-fiber-reinforced composites. The multi-scale modeling strategy mainly consisted of microscale, mesoscale and macroscale models. Firstly, the microscale representative volume element of "carbon fibers and matrix" was constructed to predict effective mechanics parameters of yarns. Moreover, the mesoscale unit cell model of "yarns and matrix" was built based on the internal geometric configuration of plain woven composites and the obtained effective mechanics parameters. Various loading scenarios were performed on the mesoscale model by periodic boundary conditions to predict effective mechanics properties of the mesoscale unit cell model. Meanwhile, the mesoscale unit cell model was simplified as an equivalent cross-ply laminate(ECPL) model with 0° and 90° layers using local homogenization method. And then, the array of ECPL model was extended to macroscale model, aiming to study the LVI and CAI behaviors. Finally, the validity of the proposed model was verified by the comparisons between the experimental and numerical values of LVI and CAI tests under different impact energy levels respectively. © 2021, China Mechanical Engineering Magazine Office. All right reserved.