Combined shaped-charge liners for explosion formation of aluminum particles with velocities up to 16 km/s

Explosive launching devices are used to test objects of rocket and space technology for resistance to the impact of meteoroids and fragments of space debris. These include shaped charges with a combined hemisphere-cylinder liner. In these charges, the formation of a high-velocity compact element occurs as a result of “cutting-off” by the collapsing liner cylindrical part of the head section of the jet flow formed from the liner hemispherical part compressed by the explosion products. Currently used shaped charges with a hemisphere-cylinder liner make it possible to obtain compact steel elements with velocities of 6 km/s. It was considered the possibility of obtaining aluminum particles with velocities up to 16 km/s using shaped charges with a combined shaped-charge liner on the basis of numerical modeling within the framework of a two-dimensional axisymmetric problem of continuum mechanics. The modeling was carried out for a shaped charge with a diameter of 100 mm using the ANSYS/AUTODYN and ERUDIT computer codes. To achieve this goal, a degressive (decreasing from apex to base) thickness was given to the jet-forming part of the liner, and the surfaces bounding it had the form of surfaces of a semi-ellipsoid or semi-superellipsoid of revolution. The geometric parameters of the combined liner were selected based on the results of the calculations, which made it possible to form an aluminum particle with a considered level of velocity with its mass in tenths of a gram. •Shaped charges with combined liner can be used to produce high-velocity particles.•Combined shaped-charge liner includes jet-forming and cutting-off parts.•Combined liners can produce aluminum particles with a velocity of 16 km/s.•Jet-forming part of combined shaped-charge liner has a degressive thickness.•Liner jet-forming part has semi-ellipsoidal or semi-superellipsoidal surfaces.