Shape-Optimized Bubbled-Armour Forms for High Resistance to Ballistic Penetration

摘要

In this study, bubbled-armour forms are assessed for ballistic penetration resistance. A key component is optimization of the bubble shape to maximize its fundamental modal frequency. A 'large-plastic-regime' automotive steel alloy is adopted for the bubble and the penetration process simulated by LS-DYNA for a 'rigid' projectile. Three forms: - a flat-, spherical and the shape-optimized one, of identical planform dimensions and mass, are studied for their penetration resistance characteristics under a common impact speed. The optimum form is found to be the most superior, causing a momentum loss of as much as 140%, implying a total reversal of the projectile, post-impact. This is more than the 111% for the spherical form and far above the 30% for the flat form. Modal response also correlates well with impact-induced bubble-response acceleration in wavelet decomposition. We conclude that with the fundamental modal frequency maximized, shape-optimized bubbled-armour forms can have much higher penetration resistance than a traditional plate armour's.