Calculation method for ballistic limit velocity of thin steel plate under vertical penetration of flat-nose hollow projectile at low velocity

Abstract

The invention relates to a calculation method for ballistic limit velocity of a thin steel plate under vertical penetration of a flat-nose hollow projectile at low velocity. According to specific conditions of a warhead and a protection structure, geometric sizes and material parameters of a flat-nose hollow projectile body and a target plate are determined; a deformation displacement field of thetarget plate near the ballistic limit velocity is determined; deformation energies of the projectile body and the target plate are calculated based on deformation and destruction characteristics of the projectile body and the target plate wherein the deformation energies of the projectile body and target plate comprise plastic deformation energy and sheer plug energy of the projectile body and plastic deformation energy of the target plate, the plastic deformation energy of the projectile body comprises the energies consumed in upsetting deformation and inner concave deformation of the hollowpart; the ballistic limit velocity of a thin steel plate under vertical penetration of the flat-nose projectile at low velocity is determined based on the energy conservation principle. The ballisticlimit velocity of the target plate is effectively predicted by the method so as to determine that whether or not the target plate can be penetrated by the flat-nose hollow projectile body or the projectile body can be blocked by the target plate, and the method can also provide an effective reference for a ballistic impact test or a numerical simulation method so as to reduce the number of testsor simulation calculation time.

Description

technical field

[0001] The invention relates to the technical field of damage and protection, in particular to a theoretical calculation method for solving ballistic limit velocity based on an energy method. Background technique

[0002] The armor-piercing penetration process is a very complex mechanical behavior. There are many factors affecting the interaction between the projectile and the target, such as the shape of the projectile, the strength ratio of the target material, the ratio of projectile diameter to plate thickness, and the velocity of the projectile. There is a big difference in the penetration performance of the target plate and the failure mode of the target plate.

[0003] The ballistic limit velocity is the basis for judging whether the projectile can penetrate the target plate, which is of great significance in the fields of damage and protection. When the initial velocity of the projectile is greater than the ballistic limit velocity, the projectile ca...

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