فهرست نشریات علمی دسترسی آزاد ایران

In this study, the numerical penetration behavior of an armor-piercing projectile with a 7.62 mm caliber into reinforced plates made of 921A steel was investigated. The plates were modeled with stiffeners having I, T, and hat-shaped cross-sections in three configurations: a single longitudinal stiffener, seven longitudinal stiffeners, and a combined (cross) arrangement. The projectile, composed of a tungsten core and a copper jacket, was analyzed using the explicit dynamics module of Abaqus at initial velocities of 400 and 500 m/s. The plate boundary conditions were considered as simply supported and fully clamped. The projectile impact location was examined under two scenarios: direct impact on the stiffeners and impact in the space between them. The criteria for selecting the optimal stiffener type and configuration included the projectile’s residual velocity, kinetic energy, energy absorbed by the plate, and the extent of plate damage. The results indicated that the T-shaped stiffener with a combined (cross) configuration provided the best performance, reducing projectile velocity by up to 79.5%. Furthermore, the simply supported boundary condition yielded a greater velocity reduction than the fully clamped one, and impacts on the stiffeners exhibited higher resistance compared to impacts between them. Comparison of simulation results with experimental data showed good agreement in terms of plate deformation and projectile jacket deformation. The study concludes with recommendations for future work, including the investigation of combined stiffeners, variations in stiffener thickness and height, and the performance verification through experimental testing.