An Application of Explosive Metal Forming in Military Field: The Relationship Between Shaped Charge Jet Formation and Thickness Variation Along Liner Length of Conical Copper Liner

Abstract

Shaped charges are very convenient in the formation of very intensive local forces required for penetration and demolition of high strength targets, important in military area. It is generally used to penetrate armored vehicles such as tanks and to demolish concrete fortifications, fuel vessels and bridge constructions, in mining and geophysics, e.g., petroleum research for hard rock penetration and cutting, also in welding and demolition works in industry. In this study, effects of wall thickness variation of the conical copper (CU-OFHC) liner in model group T1 and T2 are investigated. Wall thickness variation is taken into account from the center of the apex to the circular base edge in model group T1 and from the circular base edge to the center of apex in model group T2. In this sense, the relation between the variable thickness, and the geometry and pressure of the jet is investigated. Obtained results are evaluated to determine the stand-off distance between the shaped charge and target which is most important in jet performance. Thickness variation along the liner length changes the liner wall cross-sectional area and increases the liner total mass at both the model groups. Hence, the similar behavior is expected in the two model groups. Hence, the results do not show such a similar behavior between the two model groups. Consequently, It can be said that the dominant parameter is geometrical change, not increase in total mass. This also means that the mass distribution in the liner is determinative parameter in jet formation.