INCORPORATION OF THE DESHPANDE-EVANS MECHANISM-BASED DAMAGE MODEL INTO THE EPIC CODE

摘要

This article presents the incorporation of a mechanism-based failure model into the EPIC code. The model was developed by Deshpande and Evans (DE) and is based on micromechanics and wing-crack theory. The model includes the effects of flaw size, flaw density, fracture toughness, friction, crack shape, and crack growth rate. It is also fully 3-dimensional and covers both compression and tension. Specifically, this work incorporates the DE damage model into the Johnson-Holmquist-Beissel (JHB) ceramic model providing a micromechanical approach for computing damage. A discussion of the DE damage model and its incorporation into the JHB model is provided. Computations are presented for two ballistic impact experiments into 99.5percent - Al_(2)O_(3) ceramic including some parametric effects.