Multiscale Matrix Cracking and Delamination Damage Analyses inQuasi-isotropic Glass/epoxy Composite Laminates with Hole

Matrix cracking and delamination damage analyses of plain composite laminates show non-uniform stressfield. The induced stress field non-uniformity due to the central hole increases the complexity of the damage analyses. A multiscale continuum damage method considering both matrix cracking and delamination can be used to overcomesuch complexities. In this investigation, the previously developed damage constitutive law by the authors is used to predict the structural response of the laminates. Also a set of holed glass fiber/epoxy resin samples with quasi-isotropicsymmetric layup configurations are tested under quasi static uni-axial tensile displacement control loading condition. Different damage mechanisms in micro-scale including matrix cracking, delamination and fiber fracture causes failureof the laminates. The stacking sequence and thickness effects on the strength of the laminates are investigated. The results show that the delamination is the dominant failure mode and decreases the load carrying capability of thestructures. Also the developed numerical method predicts the non-linear damage response of the structures in good agreement with experimental data.

کلیدواژه ها:

Damage ، Delamination ، GFRP composites ، Quasi-isotropic ، Experimental