First Ply Failure of Laminated Composite Plates - A Mixed Finite Element Approach

摘要

First-ply failure (FPF) analyses of composite laminated plates have been presented in this paper.A 3-D layer-wise mixed finite element model developed by the authors (Ramtekkar,G.S.,Desai,Y.M.and Shah,A.H.(2002).Mixed Finite Element Model for Thick Composite Laminated Plates,Mechanics of Advanced Materials and Structures,9(2): 133-156.) has been employed for the computation of components of stress and strain.FPF has been predicted by using the maximum stress,the maximum strain,Tsai-Hill,Tsai-Wu and Hoffman failure theories.It has been observed that the 3-D failure theories have yielded approximately the same failure load as their 2-D counterparts because the failure of a lamina (ply) under flexure is primarily associated with the in-plane stress state.It has been demonstrated that the present methodology predicts the FPF load for cross-ply laminated plates very well.Results have been presented for cross-ply-angle-ply,symmetric-anti-symmetric and thin-thick plates to show important observations.