Abstract
The plastic deformation and the perforation of thin metallic plates subjected to normal impacts by a spherical projectile are studied. The aluminium plates of 0.3, 0.5 and 0.8mm thick and the copper plates of 0.3mm thick are used for the experiment.Dynamic tangential and normal loads of the plates at the clamping frame are rneasured by small load cells. The peak values of these dynamic loads are found to show the maximum at a little lower velocity than the perforation critical velocity vcr.The values of the perforation energy, the tangential and the normal load of the dynamic perforatiom are compared with the static ones. The dynamic perforation energies are found to be about twice the static ones.The dynamic deflection profiles of the plate are obtained by a still camera and a stroboscope. Both theoretical and experimental deflection profiles show a good agreement.
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