Rate-Dependent Off-Axis Tensile Behavior of Cross-Ply CFRP Laminates at Elevated Temperature and Simulation Using a Viscoplasticity Model

摘要

A ply-by-ply basis analysis of the rate-dependent behavior of multidirectional laminates at high temperature is attempted. Rate dependence of the tensile behavior of balanced symmetric cross-ply carbon/epoxy (T800H/2500) laminates at 100℃ is examined for various fiber orientations (θ = 0, 5, 15, 45, 90°). A laminate constitutive model is formulated using a viscoplasticity model for plies and the classical laminated plate theory for homogenization. The proposed model is applied to the rate-dependent off-axis nonlinear behavior of the cross-ply CFRP laminates. It is demonstrated that good agreements between the predicted and observed results are obtained by taking account of the geometrical hardening due to deformation induced fiber rotation and they are slightly more improved by considering the rate dependence of moduli due to viscoelasticity of polymer matrix.