Strain-Rate Effects in Replica Scale Model Penetration Experiments
Interim rept. Jul 1991-Apr 1992
SOUTHWEST RESEARCH INST SAN ANTONIO TX
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A computational study has been performed to quantify the effects of strain rate on replica-model scaled experiments of penetration and perforation. The impact of a tungsten-alloy long-rod projectile into an armor steel target at 1.5 kms was investigated. It was found that over a scale factor of 10, strain-rate effects change the depth of penetration, for semi-infinite targets, and the residual velocity and length of the projectile, for finite- thickness targets, on the order of 5. Although not modeled explicitly in the present study, the time-dependence of damage was examined. Damage accumulation is a strong function of absolute time, not scaled time. At homologous times, a smaller scale will have less accumulated damage than a larger scale therefore, the smaller scale will appear stronger, particularly in situations where the details of damage evolution are important.
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