Ply thickness influence in impact damage on CAI carbon/epoxy test specimens

초록

Damage generated due to low velocity impact in carbon/epoxy thick and thin ply composite laminates is evaluated. Hashin failure criterion was used. Both thick and thin ply models have standard CAI test specimen dimensions, with same thickness and different ply number. Thick-to-thin ply thickness ratio was assumed to be 4. Quasi-isotropic and cross-ply layups were considered, with eight plies for the thick ply model, respectively stacked as [+45/0/-45/90]S and [0/90]2S, and thirty-two plies for the thin ply model, respectively stacked as [+45/0/?45/90]4S and [0/90]8S. A low velocity impact of a rigid sphere, using iced water density in order to simulate hail was replicated in both models, with sufficient energy to generate damage with no perforation. The goal of this work is to fully understand the possible benefits offered by different ply thickness in composite materials, being possible to observe a tendency of greater local stiffness and less damage for thin laminates. © 2017 International Committee on Composite Materials. All rights reserved.

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