Abstract
In the present work, a series of hyper-velocity impact experiments was conducted on targets of aluminum alloy (A5052-H112) block using flat-head cylindrical impactors of plastic/metal/plastic multipartite structure, and the effects of the structure and the impact velocity on the shape of impact craters were investigated. The cylindrical impactors were composed of a front sabot of polycarbonate, an inner metal disk and a rear sabot of high-density polyethylene, polycarbonate or nylon 6. The metal disk was made of 2024-T4 aluminum alloy, Ti-6Al-4 V titanium alloy, or tough-pitch copper. The difference in the material composition together with the impactor's length-to-diameter ratio of 0.5 to 1.2 brought the difference in an averaged density of 1.0 to 2.1 g/cm3. The impact velocity ranged from 5.8 to 7.9 km/s. The cross sections of impact craters obtained were represented hemispherical in the bottom area, because the curvature of the crater bottom wall was regressed well with the radius of a circle arc fitting the bottom wall. Regression equations to reproduce the crater variables of penetration depth, diameter, volume and bottom-wall curvature were found using multiple-regression analysis as the product of powers of the impactor's variables of velocity, averaged density and length. Each equation had high reproducibility for its corresponding crater variable.
Published Version
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