Prediction of mechanical properties on 3D braided composites with void defects

Void defects have appeared inevitably during the manufacturing process of braided composites, which directly affect the mechanical properties and strength of braided composites. First, the influence of internal void and porosity on the mechanical properties of resin was predicted. Second, the evolution in the mechanical properties of three dimensional (3D) braided composites was obtained using the Mori-Tanaka method. Finally, the strength prediction, failure mode, stress and strain field of 3D braided composites with void defects were investigated by means of finite element simulation based on the progressive damage theory in ABAQUS, which will compare the simulation results with the theoretical results and other scholar's experiments. The innovation of this work is to establish the constitutive model and finite element model of 3D braided composite material with voids and predict the evolution of the mechanical properties of 3D braided composite material with defects. The results will provide the theoretical and design basis for evaluating the influence of void defects on the mechanical properties of 3D braided composites.