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Ballistic Modeling of S-2 Glass/SC-15 Epoxy Composites Using Mesoscale Models



Traditional continuum models can typically be used to model the elastic behavior of composite structures, but they often break down once nonlinear deformation and damage begin to occur. Accurate modeling of these behaviors, however, is required for accurate predictions of the composite’s response to ballistic impact. Thus, many current efforts have focused on mesoscale modeling to better capture the relevant deformation and damage mechanisms that can occur within composites. New mesoscale models describing S-2 glass/SC-15 epoxy resin plainweave and 3D-weave composites were recently created. Because the yarns, matrix, and interfaces are individually defined, the models can capture damage due to yarn breakage and yarn/matrix delamination despite the use of simple material models for each component. The mesoscale models were previously validated against quasistatic and medium-rate mechanical tests that subjected composite specimens to a larger variety of tensile and shear loads than are typically used during typical model validations found in the literature. In this study, simulation results using the plainweave mesoscale model are compared to ballistic data and photographs from tested composite panels available in the literature. The mesoscale models can accurately predict the ballistic limit of S-2 glass composite panels and damage extents after impact.

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