Numerical Prediction of the Impact Fracture of a Projectile Through Oblique Target

In modern warfare, oblique penetration is frequently observed when a penetration warhead mounted on a guided missile hits the target. When oblique penetration occurs on hard targets, such as reinforced concrete, the projectile experiences complex stress states along with tensile and compression stresses that can result in the deformation and fracture of the projectile. Therefore, the survivability of the projectile should be determined at the design phase. Structural survivability was assessed here through a correlated simulation considering a case where the projectile was fractured while penetrating into a 30° inclined concrete target at 333 m/s. For correlated simulation, we obtained the dynamic constitutive equation and fracture properties of the projectile material (AISI4340 steel) up to a strain rate of 1500 s−1. Furthermore, concrete material coefficients related to the strain rate sensitivity were calibrated using the test database. Computational analysis result agreed well with the actual test result.