Penetration damage similarity-based metal plate frame structure equivalent design method

Abstract

The invention provides a penetration damage similarity-based metal plate frame structure equivalent design method, which comprises the following steps of: determining the weight and the speed of a warhead and the geometric dimension and the material of a target plate frame structure according to the specific conditions of the warhead and a penetration ship target; enabling the prototype grillage structure reinforcing ribs to be equivalent to the thickness of a flat plate through ultimate bending moment; for the prototype material equivalent thickness flat plate, calculating the equivalent thickness of the model material flat plate through a deformation equivalent method considering the strain rate effect; converting the model material equivalent thickness flat plate into a model material grillage structure based on an extreme bending moment equivalence principle and a ship structure statistical law; based on a finite element method, calculating penetration dynamic responses of the prototype grillage structure and the model material grillage structure, wherein the penetration dynamic responses comprise the residual speed, the crevasse diameter and the plastic zone diameter, and checking effectiveness of material equivalent design. A single-layer target material equivalent design method can be guided, the similarity of the remaining speed, the crevasse and the plastic area is guaranteed, and the manufacturing cost is reduced.

Description

technical field [0001] The invention relates to an equivalent design method for a single-layer target material, in particular to an equivalent design method for a metal plate frame structure based on penetration damage similarity, and belongs to the technical field of warhead penetration performance evaluation. Background technique [0002] The evaluation of the penetrating ability of the warhead is an important part of evaluating its actual combat performance. Penetration ability is usually evaluated by ship target penetration test. However, special steel for ships is expensive, and the cost of targets made of special steel is too high. Therefore, it is necessary to develop a material equivalent design technology that uses ordinary steel instead of special steel. [0003] At present, the strength equivalent method is mainly used in China to replace special steel with ordinary steel. For flat plates, this method ensures that the product of plate thickness and yield strength...

AI Technical Summary

Problems solved by technology

On the other hand, the mechanical penetration response of a stiffened plate is different from that of a flat plate, and its ribs will significantly affect the remaining velocity and ballistic trajectory

Domestically, the stiffened plate can only be tested as a flat plate through the strength equivalent method, which cannot achieve the similarity of penetration damage

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