A Calculation Method of Ballistic Limit Velocity of Flat-nosed Projectile under Low Velocity Positive Penetration of Thin Steel Plate

Abstract

The invention relates to a method for calculating the ballistic limit velocity of a flat-nosed projectile under low-speed positive penetration of a thin steel plate. According to the specific conditions of the warhead and the protective structure, the geometric dimensions and material parameters of the projectile body and the target plate are determined; the target near the ballistic limit velocity is determined. The deformation displacement field of the plate; according to the deformation and failure characteristics of the projectile and the target plate, the deformation energy of the projectile and the target plate is calculated: the deformation energy of the projectile and the target plate includes the plastic deformation energy of the projectile, the shear punching energy, the target The plastic deformation energy of the plate and the plastic deformation energy of the projectile are mainly the energy consumed by the thick deformation of the projectile; based on the principle of energy conservation, the ballistic limit velocity of the flat-nosed projectile penetrating the lower thin steel plate is determined. The method of the present invention can effectively predict the ballistic limit velocity of the target plate to judge whether the projectile can penetrate the target plate or whether the target plate can effectively block the projectile, and can also provide effective reference for ballistic impact experiments or numerical simulation methods. Reduce the number of experiments or simulation computation 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...

AI Technical Summary

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 element simulation calculation process is greatly affected by the grid size, the projectile and target materials The uncertainty of the model, so its calculation accuracy and reliability need to be further verified

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