Research on High-Velocity Perforation Characteristics of Elliptical Cross-Section Truncated Ogive Projectile

With the development of the hypersonic weapon system, the non-circular cross-section projectile with more space utilization has attracted extensive attention. The high-velocity penetration mechanism of the non-circular cross-section projectile is a crucial issue that must be solved. Based on the truncated conical head structure of a typical anti-ship warhead and the elliptical section projectile shape, the resistance characteristics of the projectile and the damage mechanism of the metal sheet are studied by numerical simulation. The load of the projectile is divided into two parts: shear punching resistance and ductile enlargement resistance. The results show that the elliptical cross-section truncated ogive projectile (ETOP) penetrating the metal sheet can be divided into the head and body penetration stages. In the head invasion stage, the failure mode of the sheet is decomposed into the shear plugging caused by the truncated cone platform and the ductility enlargement of the curved surface of the head. Under high-velocity impact, the damage to the sheet caused by the ogive/blunt projectile with the elliptic-section is different from that caused by low-velocity impact. When the ogive projectile penetrates the sheet, ductile enlargement failure occurs. When a blunt projectile impacts the sheet at high velocity, the coupled failure mode of shear punching and ductile enlargement occurs. The resistance of the elliptical cross-section projectile is the same as that of the circular cross-section projectile with the same area. The difference is that the asymmetric structure of the elliptical cross-section leads to non-uniform load distribution.