Numerical simulations and analysis of ballistic impact and penetration by tungsten alloy rods into composite targets consisting\nof layers of aluminum nitride ceramic tile(s), polymer laminae, and aluminum backing are conducted over a range of impact\nvelocities on the order of 1.0 to 1.2 km/s. Computational results for ballistic efficiency are compared with experimental data fromthe\nliterature. Simulations and experiments both demonstrate a trend of decreasing ballistic efficiency with increasing impact velocity.\nPredicted absolute residual penetration depths often exceed corresponding experimental values. The closest agreement between\nmodel and experiment is obtained when polymer interfaces are not explicitly represented in the numerical calculations, suggesting\nthat the current model representation of such interfaces may be overly compliant.The present results emphasize the importance of\nproper resolution of geometry and constitutive properties of thin layers and interfaces between structural constituents for accurate\nnumerical evaluation of performance of modern composite protection systems.
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