Epic penetration simulation

Description:Interfaces between layers may strongly influence performance of such systems under ballistic impact. It was speculated that soft polymer layers in the three tile configuration enabled dispersion of the initial, primary compressive shock wave that caused more severe damage in the single tile configuration. When the material deforms elastically, , where is the effective strength of the solid that generally depends on strain, strain rate, temperature, pressure, and damage. Numerical simulations invoking finite element methods, for example, those of ballistic impact of ceramic systems, are described in [ 9 — 11 ]. Lateral tile dimensions were Assuming small elastic deformation, or assuming an additive decomposition of the rate of stretching into elastic and inelastic parts in the spatial frame independent from such a multiplicative split, the spatial velocity gradient can be written, with being skew spin tensor is symmetric and can be split into deviatoric and hydrostatic parts, letting denote pressure; also the scalar Mises effective stress is defined in the following equation: The closest agreement between model and experiment is obtained when polymer interfaces are not explicitly represented in the numerical calculations, suggesting that the current model representation of such interfaces may be overly compliant.

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