椭圆截面截锥弹体的高速穿甲特性及阻力模型

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’s shape, the elliptical section’s resistance characteristics and damage mechanism of thetruncated cone projectile through the metal sheet at high velocity are studied by numerical simulation. The load applied on the projectile is divided into two parts: shear punching resistance and ductile enlargement resistance. Combined with the numerical simulation results, the high-velocity penetration resistance function and the analytical model of residual velocity are proposed, which are suitable for elliptic cross-section flat projectile and ogive projectile. The differential surface force method and rigid body dynamics are used to construct a normal penetration model, and numerical simulation results verify the validity of the theoretical model. The results show that the elliptical cross-section truncated cone projectile penetrating through the metal sheet can be divided into the head penetration stage under load and the body penetration stage without load. In the head invasion stage, the failure mode of the thin sheet due to project penetration 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 elliptic ogive projectile/blunt projectile is different from that caused by low-velocity impact. When the ogive projectile penetrates through the sheet, ductile enlargement failure occurs. When the sheet is impacted by blunt projectile at high velocity, the coupled failure mode of shear punching and ductile enlargement takes place. The resistance of the elliptical cross-section projectile is the same as that of the circular cross-section projectile with the same cross-sectional area. The difference is that the asymmetric structure of the elliptical cross-section projectile leads to non-uniform load distribution.