Simulation-Based Evaluation of Alumina and Weldox Steel Panels Against National Institute of Justice Type IV Ballistic Threats

Abstract

This study sought to evaluate several panel configurations consisting of Alumina and Weldox 460 E Steel with the objective of advancing our comprehension of ballistic performance and impact resistance. The crucial parameters of Velocity Ballistic Limit (Vbl), depth of penetration (DOP), Deflection, and the deformation of projectiles and panels were thoroughly and rigorously investigated. The present study expands upon the existing body of research, drawing upon the groundwork established by previous studies. The validation is achieved by conducting a comparative analysis of our findings in relation to the previous researcher. In order to carry out these extensive simulations, we utilised the finite element method, explicitly employing the ANSYS/Explicit Dynamic solver AUTODYN and implementing a simplified 2D Axisymmetric model. A series of ballistic experiments were conducted using various combinations of Alumina and Weldox 460 E steel panels, covering a wide range of bullet velocities. Our analysis focused on seven-panel combinations, namely WL12, AL5+WL5, AL5+WL10, AL10+WL5, AL10+WL10, AL12+WL12, and AL15+WL15, each of which was distinct from the others. The results obtained from our calculations indicate that both the AL12+WL12 and AL15+WL15 panel configurations have met the stringent requirements of the National Institute of Justice (NIJ) Type IV standard in terms of their ability to withstand projectiles. The AL12+WL12 configuration demonstrated a depth of penetration (DOP) of 23 mm, a deflection of 4.3 mm, and a Velocity Ballistic Limit (Vbl) of 954.68m/s. The AL15+WL15 arrangement demonstrated notable performance, with a DOP of 21 mm, a deflection of 1.4 mm, and an impressive Vbl of 1345.9m/s, which stands in stark contrast to other configurations. The results of our investigation highlight the exceptional performance of the AL15+WL15 panel configuration in resisting NIJ Type IV bullets, thus solidifying its position as the most optimal selection.