Study on the Composite Structure of Aluminum Foam-Filled Thin-Walled Metal Tube to Reduce the Charge Overload inside the Projectile during the Penetration Process

Fudi Liang,Zengyou Liang,Dezhi Deng,Jiang Jin

doi:10.1155/2020/8887893

Abstract

When a projectile penetrates a target at high speed, the charge loaded inside the projectile usually bears a high overload, which will consequently severely affect its performance. In order to reduce the overload of the charge during the penetration process, the structure of the projectile was improved by adding two buffers at both ends of the charge. In this study, the mathematical expressions were first gained about the axial buffering force generated by the thin-walled metal tube, aluminum foam, and the composite structure of aluminum foam-filled thin-walled metal tube when they were impacted by the high-speed mass block through reasonable assumptions and stress analysis. During the experiment on the high-speed projectile penetrating reinforced concrete target, the acceleration curve of the charge and the projectile body were obtained. The results show that the maximum overload that the charge was subjected to during the launch and penetration process was significantly reduced, and the change in overload, which the charge was subjected to during the penetration process, was also less obvious.

Highlights

Earth penetrating weapon (EPW) is used to strike deep underground targets. e process of destroying the target can be divided into two steps: first of all, EPW breaks through the protective layer of the target, when the EPW must have a high speed to make sure that it can get into the target; the EPW detonates the charge with the action of fuse to destroy the target
E methodology applied in this research is theoretical analysis and experimental verification: first of all, a theoretical analysis was conducted on the stress conditions of thin-walled metal tube, aluminum foam, and composite structure when they were impacted by high-speed mass
In terms of theoretical and practical aspects, the main conclusions of this work can be summarized as follows: (1) A theoretical analysis was made on the dynamic response of the thin-walled metal tube and composite structure of aluminum foam-filled thin-walled metal tube under the impact of high-speed mass block was theoretically analyzed, together with some assumptions put forward

Summary

Introduction

Earth penetrating weapon (EPW) is used to strike deep underground targets. e process of destroying the target can be divided into two steps: first of all, EPW breaks through the protective layer of the target, when the EPW must have a high speed to make sure that it can get into the target; the EPW detonates the charge with the action of fuse to destroy the target. E charge suffers a very high shock overload when the EPW penetrates the protective layer at a high speed. E thin-walled metal tube and aluminum foam could absorb energy of the impact and collision through the elastic-plastic deformation and have the advantages of having the simple structure and stable operation [2,3,4]. E main content of this research is how to apply the advantages of foam aluminum and thin-walled metal tubes in the field of energy absorption to EPW to reduce the impact load of the charge during the penetration process. E methodology applied in this research is theoretical analysis and experimental verification: first of all, a theoretical analysis was conducted on the stress conditions of thin-walled metal tube, aluminum foam, and composite structure when they were impacted by high-speed mass. An experiment was conducted on the EPW penetration into reinforced concrete to verify the effectiveness of buffers for reducing the overload of the charge

Theoretical Analysis

Experiment

Findings

Conclusion