Three-Dimensional Numerical Simulation of Residual Stress of Z-Pin Composites During Curing Process

Abstract

By using the coupled thermos-mechanical method, a three-dimensional finite element model of composite was established during the curing process. The accuracy of the simulation model was validated by performing a comparison with the literature results. Based on the model, a three-dimensional finite element method is applied to conduct analysis of the effect exerted by the curing related parameters on residual stresses in the curing process for the Z-pin AS4/3501-6 composite. The results indicate that the resin stress and fiber Z-direction stress increase with the curing process, especially during the cooling stage. The bottom stresses of both resin and fiber are observed to be lower than that of top layer. The stress of rich-resin zone at pin/fiber interface is higher but the deformation is smaller. The stress of resin and fiber increases as the volume shrinkage ratio of resin is on the rise.