A fully implicit plasticity model for the characterization of ceramics in ballistic protection
Erik Simons (TU Delft - Applied Mechanics)
J. Weerheijm (TU Delft - Applied Mechanics)
L. J. Sluijs (TU Delft - Applied Mechanics)
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Abstract
The Johnson-Holmquist-2 ceramic model is used for quasi-static indentation simulation. A modification is proposed to an associated plasticity formulation. This allows for a fully implicit solution scheme, where dilatation is used instead of the traditional explicit bulking formulation. Dilatation is shown to have an important influence on ring-crack formation during indentation. A mesh refinement study is performed to show the current tensile failure behaviour leads to mesh-dependent results.