A computational constitutive model has been developed to characterize the progressive failure behavior of triaxial-braid composite laminates under ballistic impact conditions. Using a minimechanical approach, a triaxial-braid composite layer is represented by a collection of three representative yarn bundles with proper volume fractions. The damage progression in the yarn bundles is assumed to be governed by the strain-rate dependent bundle progressive failure model using the continuum damage mechanics approach. The composite failure model has been successfully implemented within LS-DYNA as a user-defined material subroutine. The availability of this design tool will greatly facilitate the development of composite structures with enhanced ballistic survivabilityconsisting optimized fiber architectures with enhanced survivability under ballistic/blast threats.
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