A Calculation Method of Critical Detonation Distance of Airburst Shock Wave and High-speed Fragment of Natural Fragmentation Warhead

Abstract

The invention relates to a method of calculating the critical collapse distance of successive actions of shock waves and high-velocity fragments under natural fragment warhead air explosion, comprising seven steps: S1, calculating the initial velocity of fragments; S2, calculating the size of equivalent bare charge; S3, calculating the limit expansion radius of the warhead; S4, deducing the relationship between the flight distance and time of the fragments in the air; S5, getting the relationship between the propagation distance and time of the wave front of shock waves in the air based on the calculation result of S2; S6, calculating the moving distances of the shock waves and high-velocity fragments when the shock waves and the high-velocity fragments meet each other under the condition that the propagation distance of the shock wave front and the flight distance of the fragments are equal at the same time; and S7, summing the results of S3 and S6 to get the critical collapse distance of successive actions of the shock waves and the high-velocity fragments under natural fragment warhead air explosion. Through the method, the critical collapse distance of successive actions of shock waves and high-velocity fragments under natural fragment warhead air explosion can be calculated accurately. The method has high practical value and a broad application prospect in fields like damage and protection.

Description

technical field [0001] The present invention relates to a method for calculating the formation characteristics and propagation (movement) rules of damage elements under the air explosion of a natural fragment warhead, in particular to a dynamic calculation method for the critical detonation distance of shock waves and high-speed fragments acting successively under the air explosion of a natural fragment warhead. It can be applied in the fields of damage and protection to reasonably evaluate the damage effect of the warhead or provide a reference for the design of the protective structure. Background technique [0002] Under the air explosion of the fragment warhead, two kinds of damage loads, shock wave and high-speed fragment, will be generated simultaneously. In addition, due to the chemical reaction of the explosive itself, certain detonation products will be formed. In comparison, contact explosions cause more serious damage to structures, but the probability of non-con...

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Problems solved by technology

However, due to the fluid-solid coupling problems involving various media such as shell materials, explosives, and air, the finite element numerical simulation calculation requires a lot of computing resources and time, and the finite element simulation calculation process is greatly affected by the mesh size. , its accuracy and reliability need to be verified; while the gridless numerical simulation calculation also has the problem of consuming a lot of computing resources and time

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