Perforation of Thick Metallic Plates Analysis with Bifurcation Theory

摘要

Many analytical models provided the curve residual velocity versus initialvelocity for a projectile, after performation of the target. In order to analyze the whole problem of perforating moderately thick plates by quasi-rigid cylinders without any impact results, the authors use a numerical simulation (EFHYD2D code). One of the main difficulties is to determine a suitable criterion to represent the rupture of the plate. For this, the authors examine the bifurcation theory of elastoplatic media. They study, in particular, four materials: an armour steel (BLD), an ordinary steel (1017) and two aluminum alloys (2017 and 5083). The authors' comparison with experiments is limited to striking velocities lower than 360 m/s.