NUMERICAL INVESTIGATION ON THE IMPACT STRENGTH PROPERTIES OF WELDOX STEEL, PURE COPPER, 2024-T3-ALUMINUM ALLOY, TI-6AL-4V TITANIUM ALLOY AND SOME COMPOSITES

摘要

In recent times as civilian technology has grown more sophisticated, more demands are being made on the study of behavior of materials under very short duration loading. This paper describes a numerical comparison of the penetration and perforation of circular plates, struck by blunt projectile based on Johnson-Cook failure model and isotropic failure model. Explicit finite element code (ABAQUS) is used for the simulation. The better of the two failure models is used to investigate the penetration and perforation behavior of four different plate materials namely Weldox Steel, Pure Copper, 2024-T3 Aluminum alloy and Ti-6Al-4V Titanium alloy, struck by blunt and conical shaped projectiles. Nominal hardness, diameter, and mass of the projectile are kept constant in all simulations. The thickness of the plates is varied from 8mm to 40mm. The initial and residual velocities are determined from the numerical simulations. The ballistic limit velocity and the residual velocity curves are obtained for each target thickness tested. The plastic dissipation and strain energy curves are also obtained for each target thickness and plotted for different thickness-to-diameter ratios. Finally the numerical modeling of composite laminates of AS4 Carbon/Epoxy, Kevlar 149/Epoxy, AS4 Carbon/Peek and Kevlar 149/Peek are also compared for different thickness-to-diameter ratio to predict the composite laminate that has the highest impact strength.