Calculation method for ballistic limit velocity of thin steel plate under vertical penetration of flat-nose 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 projectile at low velocity. According to specific conditionsof a warhead and a protection structure, geometric sizes and material parameters of a projectile body and a target plate are determined; a deformation displacement field of the target 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 is mainly the energy consumed in upsetting deformation of the projectile body; the ballistic limit velocity of a thin steelplate under vertical penetration of the flat-nose projectile at low velocity is determined based on the energy conservation principle. The ballistic limit velocity of the target plate is effectivelypredicted by the method so as to determine that whether or not the target plate can be penetrated by the 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 tests or 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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Problems solved by technology

However, the ballistic impact experiment consumes huge manpower and material resources; while the numerical simulation method consumes a lot of computing resources and time, and because the finite elemen...

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