Numerical Investigation on the impact strength of back plates of  Weldox Steel, Pure Copper, 2024-T3 Aluminum alloy, Ti-6Al-4V Titanium alloy and some composites
Mr. Rengaa Venkataraman, Bradley University
Dr. Abdalla Elbella, Bradley university
Mr. Potluri Krishna, Bradley University

Abstract:

Impact and impact related problems have been a considerable research topic for decades, and substantial effort has been invested in order to physically understand and mathematically describe the phenomena taking place during high velocity ballistic penetration. Back plates form an important application area in the field of impact dynamics by enhancing the impact strength with proportionally lesser increase in cost and weight. This paper describes a numerical evaluation of the penetration and perforation of circular plates, struck by blunt projectile based on Johnson-Cook failure model. Explicit finite element code (ABAQUS) is used for this purpose. The effect of using back plates with master plate of different combinations of materials namely Weldox Steel, Pure Copper, 2024-T3 Aluminum alloy and Ti-6Al-4V Titanium alloy is studied. Nominal hardness, diameter, and mass of the projectile are kept constant in all simulations. Measurements of the initial and residual velocities are made from the numerical simulations. The ballistic limit velocity, the residual velocity, the plastic energy dissipated and the strain energy absorbed in each case is studied and compared. 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 back plate applications to predict the composite laminate that has the highest impact strength for reduced cost and weight.

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