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

• Published in: Acta astronautica 2022-01, Vol.190, p.231-240
• Main Authors: Fedorov, S.V., Kolpakov, V.I., Vinogradova, E.P., Bolotina, I.A.
• Format: Article
• Language: English
• Subjects: Alliances; Aluminum; CAD; Combined liner; Computer aided design; Computer codes; Continuum mechanics; Cylinder heads; Cylinder liners; Diameters; High-velocity aluminum element; Jet flow; Launching; Liner cutting-off part; Liner jet-forming part; Meteoroids; Numerical modeling; Shaped charge; Shaped charges; Space debris; Two dimensional models; Velocity
• ISSN: 0094-5765; 1879-2030
• DOI: 10.1016/j.actaastro.2021.10.020

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.