جستجوی مقالات مرتبط با کلیدواژه "پرتابه پله" در نشریات گروه "مکانیک"

In this paper, using analytical, numerical and experimental methods, the range of ballistic limit thickness and fragmentation behind the metal target for the PELE projectile has been investigated. PELE projectile consists of two parts: hard shell with high density and soft core with low density. The soft core is compressed inside the hard shell and upon impact, the hard shell penetrates the target. There are limited models to analyze the penetration and fragmentation of this projectile, and few researchers have addressed this issue. Considering the effect of target characteristics (thickness and material) on the rate of fragmentation and the failure to consider these parameters in the models presented so far, establishing a relationship between the main parameters (target, impact velocity and projectile), using two shock theories and the dynamic expansion of the spherical cavity and their combination with the cracking model have been investigated in this article. In parallel, the experimental tests of the impact of the PELE projectile on the metal target (gas gun - extraction of ballistic limit thickness) and also 3D simulation of finite elements (Auto Dyna software - extraction of shrapnel number) have been carried out in the impact velocity range of 312-780 m/s. According to the appropriate results of the shock wave method compared to the results of the dynamic expansion of the spherical cavity (smaller difference compared to the experimental and simulation results), the final ballistic performance range (the number of shrapnel according to the target thickness and impact velocity) of this method for the velocity range impact rates of 100 to 1000 meters per second were extracted.