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Constitutive Model Parameter Study For Armor Steel And Tungsten Alloys
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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A computational parametric study was performed to assess the influence of the selection of Johnson-Cook constitutive model parameters on the numerical simulation of tungsten rods penetrating rolled homogeneous armor RHA steel targets. The parameter space involved two sets of Johnson-Cook model parameters for RHA, two sets of Johnson-Cook parameters for the tungsten rod material, four tungsten rod length-to-diameter LD ratios, and two continuum mechanics codes. Striking velocities considered in the study ranged from approximately 1000 - 2000 ms. The study revealed that no single combination of Johnson-Cook model parameters provides superior overall prediction of penetration depth over the other possible combinations across the full range of rod LD considered. The study provides valuable guidance on the selection of material model parameters future studies of kinetic energy penetration.
APPROVED FOR PUBLIC RELEASE