Abstract
We report the results of a study focused on identifying the effects and significance of adiabatic shear band formation in metal penetration phenomena. We performed experiments in which targets of 6061-T6 aluminum were impacted by hardened steel spheres at velocities varying from 0.6 to 1.2 km/s. The targets were large enough to be treated as infinite half-spaces in subsequent analyses. Depth of penetration and target microstructure were observed after each experiment, and compared with the results of quasistatic punch tests performed on identical targets. Shear bands were observed in the targets for the dynamic experiments, but were absent in the quasistatic tests. Analyses performed indicate that thermal softening and/or thermal shear localization does strongly influence the dynamic penetration process, although not as significantly as previously reported.
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