Specifics of generating explosively formed projectiles of variable shape from metal liners
The study proposes to use charges forming high-speed elongated elements (HSEE) with a variable shape for ground-based simulation of the penetration of particles and elements into the spacecraft's hull. During the operation of such a charge, an explosive throws a metal lining over a distance of several hundred charge diameters. The metal segment lining is deformed during the throwing process and takes the form of an elongated element. In calculations we used steel linings with a degressive and progressive profile whose outer and inner surfaces are formed by spherical surfaces, as well as by a combination of spherical and conical surfaces. The paper shows the results of a numerical analysis which determines the effect of the geometric and physico-mechanical parameters of segmented cumulative linings on the efficiency of the charges forming high-speed elongated elements. The efficiency of the charges was determined by the characteristics of the formed element, i.e. elongation, degree of fullness and the diameter of the horizontal stabilizer. Furthermore, we established the dependences which describe the effect of the lining material dynamic yield point and the radius of transition of the spherical surface to the conical surface on the elongation of the element and the diameter of the horizontal stabilizer. We also showed the possible contradictory effect of changing the radius of transition of the spherical surface of the lining into the conical surface on the aerodynamic stability parameters of the high-speed elongated element.