CONSTITUTIVE MODELS FOR CONCRETE PENETRATION ANALYSIS

Three-dimensional axisymmetric calculations of penetration of concrete targets have been conducted with the GALE (Arbitrary Lagrangian Euler ian) code. All the constitutive models studied accounted for the compr essibility of concrete and employed either solid or porous equation of state models; the influence of these models on the penetration calcul ations is studied and presented. The size of the plastic zone in front of the penetrator is estimated from the calculations for both compres sibility models and is compared with the available experimental data. Comparison between the calculated values of the extent of this zone an d the experimental data indicates that the porous equation of state mo del is more realistic in representing the elastic-plastic deformation in concrete. Effects of the initial porosity of concrete on penetratio n calculations are also studied and discussed. The application of cons tant yield-strength and pressure-dependent yield-strength models for t he concrete penetration analysis is studied, and the results of the ca lculations are presented and discussed. Crater profiles calculated wit h the pressure-dependent yield model showed good agreement with the av ailable experimental penetration depths and the profiles of the tunnel portion of the crater.