Numerical analysis of explosive formation of high-velocity metal particles from hemisphere-cylinder combined shaped-charge liners for the objects testing on anti-meteoric resistance

• Main Authors: Vladimirovich, Fedorov Sergey, Vyacheslavovich, Ladov Sergey, Mikhailovna, Nikol’skaya Yana
• Format: Conference Proceeding
• Language: English
• Subjects: Alliances; Continuum mechanics; Cylinder heads; Cylinder liners; Diameters; Jet streams (meteorology); Kinetic energy; Launching; Metal particles; Numerical analysis; Shaped charges; Velocity
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0036489

Due to their capability to form high velocity elements, explosive launching devices are used for testing objects of rocket and space technology on anti-meteoric resistance. These devices include shaped charges with a combined hemisphere- cylinder liner. Formation of a high-velocity compact element in this liner results from the "cutting off" by the liner collapsing cylindrical part of the jet stream head section. This head section is formed from the liner hemispherical part compressed by the explosion products. Currently used shaped charges with a hemisphere-cylinder liner can produce compact steel elements with velocities of 6 km/s. Based on numerical simulation in the framework of the two-dimensional axisymmetric problem of continuum mechanics, the possibilities of increasing the velocity of compact metal elements formed by shaped charges with a combined hemisphere-cylinder liner up to 9…10 km/s are considered. Simulation has been performed for a 100 mm diameter shaped charge with a copper liner. The stated goal has been achieved by giving the jet-forming hemispherical part of the liner a degressive (decreasing from the top to the base) thickness with a change in its shape from hemispherical to semi-ellipsoid. As a result of calculations, liners geometric parameters have been selected to form compact elements of maximum possible mass with velocities in the range from 5 to 9.5 km/s. An analysis of their mass-velocity characteristics showed that up to a velocity of about 8 km/s, the accompanying increase in velocity decreases the mass of elements so that their kinetic energy remains approximately constant. With an increase in velocity over 8 km/s, the kinetic energy of the formed elements begins to decrease. For an element with a velocity of about 9.5 km/s, the mass was about 5 g.