Phase transitions effect on interaction of aluminum alloys at velocities exceeding 9 km/s. (November 2020)

• Record Type: Journal Article
• Authors: Rumyantsev, B.V.; Guk, I.V.; Kozachuk, A.I.; Mikhaylin, A.I.; Pavlov, S.I.; Silnikov, M.V.; Podchufarov, A.Y.
• Is Part Of: Acta astronautica. Volume 176(2020)
• Page Start: 609
• Page End: 612
• Publication Date: 2020-11
• Subjects: Spacecraft shield protection -- Manmade debris -- Shaped charge jet penetration -- Shock adiabat -- Unloading adiabat -- Phase transitions -- Hypervelocity impact; Astronautics -- Periodicals; Outer space -- Exploration -- Periodicals; Astronautics; Periodicals; 629.405
• DOI: 10.1016/j.actaastro.2020.04.036
• Languages: English
• ISSNs: 0094-5765

Abstract

Abstract: The authors investigate aluminum shaped charge jet (SCJ) penetration into an aluminum alloy target at 8–11 km/s velocities. The analysis of kinetics, penetration parameters and structures of cavern surfaces formed after the penetration show that at velocities exceeding 9–11 km/s, the hydrodynamic character of the penetration changes due to the melting of the interacting materials. When during the penetration process SCJ velocity exceed 9 km/s, porous layer of aluminum nanospheres with 20–100 nm in diameter form in the penetration region. The results obtained are appropriate for developing spacecraft shield protections against most dangerous space fragments. Highlights: Hydrodynamic penetration of shaped charge jet changes due to the melting. Melting destabilizes penetration at velocities over 9 km/s. Porous layer of nanospheres forms on the cavern walls. Number of nanospheres decreases with increasing penetration depth.