| In this study, dynamic deformation characteristics of three aluminum alloys, i.e., 2090 Al-Li, Weldalite 049, and 7039 Al, were investigated in order to analyze ballistic performance. The dynamic shear stress-shear strain curves were obtained by dynamic torsional tests using a torsional Kolsky bar, and then correlated with microstructure and the tendency of adiabatic shear banding. The results indicated that the dynamic shear stress-shear strain curves matched well with the microstructural observation, suggesting that the dynamic torsional test might be a powerful tool for evaluating ballistic performance of metallic materials. Measured dissipated energy during dynamic shear deformation, E_s was also found to be useful for explaining the dynamic deformation characteristics of the aluminum alloys. |
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