Orthogonal Analysis of Linear Shaped Charges Jet Penetrating Layered Targets

Abstract

Abstract This paper reports on the linear shaped charges (LSCs) jet penetrates into double layer spaced targets. The distance between the LSCs and the first layer target is 0.2 times width of the LSCs, the distance between the LSCs and the second layer target is 25 times width of the LSCs. The mechanism of LSCs penetrate into the double layer spaced targets causing less collateral damage in terms of jet residues has been studied by experiment and numerical simulation. After the LSCs has been crashed by detonation wave, a linear metal jet formed and penetrates into the first layer plate, then the jet is separated into jet tip and slug. The jet tip penetrates into the second layer plate and consumed, then a strip pit formed on the surface of the back plate. The slug penetrates into the second layer plate subsequently and consumed. Due to the stress concentration and tensile fracture, the second layer target is broken and less residue of jet pass it. Experiments were made and the results indicated that the numerical simulation results agreed fully with the physical principle. A verification plate was used in the experiment to test the collateral damage of residual jets. When the space between verification plate and back plate of the layered target is 500mm, both of the experimental results and simulation results show that there is no obvious damage to people. The relationship between the performance of jet and the parameters of LSCs has been analyzed by an orthogonal method (significance test and interaction effect analysis). A good teamwork should be done for all the key parameters of LSCs which can break the spaced targets with less collateral damage.