Numerical simulation study on collinear EFP from warhead with double layer liners penetrating into target

Changxiao Zhao,Xin Wang,Weitao Feng,Fangyu Zhang,Sunlang Lin,Chong Ji

doi:10.21595/vp.2021.22214

Abstract

In order to improve the penetration efficiency of the traditional explosively formed projectile (EFP) warhead, a new warhead with double layer liners formed collinear EFP was designed. In order to get the law of its formation and penetration into different type target, the process of the collinear EFP from warhead with double layer liners forming and penetrating into targets was simulated by using LS-DYNA software. It is obtained that the double layer liners formed two EFPs with different axial velocities under the action of detonation wave, and the velocity of the front EFP is higher than that of the rear EFP, which makes the front EFP and rear EFP separation during the flight, so it can effectively attack the reactive armor. For finite thickness target, the front EFP can effectively penetrate the hole on the target, and the rear EFP will enlarge the hole. For infinite thickness target, the collinear EFP can effectively increase the penetration depth. Compared with the single EFP, the collinear EFP from warhead with double layer liners can increase the penetration depth by 36 %.

Highlights

As the explosive reactive armor and other new armor structures are widely used in tanks and other armored vehicles, the damage efficiency of the traditional explosively formed projectile (EFP) warhead has been severely challenged
Tosello et al [5] carried out numerical simulation and experimental research on the underwater motion of double-layer spherical defect hood composed of tantalum and nickel
In order to obtain the specific process of collinear EFP from warhead with double layer liners penetrating the finite thickness and the infinite thickness target, the process of collinear EFP from warhead with double layer liner penetrating the target was simulated by using LS-DYNA software

Summary

Introduction

As the explosive reactive armor and other new armor structures are widely used in tanks and other armored vehicles, the damage efficiency of the traditional explosively formed projectile (EFP) warhead has been severely challenged. The front EFP is used to detonate the explosive reactive armor, and the rear EFP continues to penetrate the main armor, so as to effectively improve the damage efficiency to new armor. It has become a hotspot of warhead technology research [1,2,3,4,5,6,7]. In order to obtain the specific process of collinear EFP from warhead with double layer liners penetrating the finite thickness and the infinite thickness target, the process of collinear EFP from warhead with double layer liner penetrating the target was simulated by using LS-DYNA software

Numerical simulation calculation model

Findings

Conclusions