title: Localized microjetting in the collapse of surface macrocavities.
abstract: This paper focuses on the multiscale mechanism of collapse of hemicylindrical annular surface macrocavities in steel caused by high-strain, high-strain rate plastic flow of copper. Experiments and simulations revealed that a two-stage process is responsible for the observed microjetting phenomena: the formation of lateral copper microjets from the localized shear flow in copper at the interface during the filling of the cavity, and their subsequent collision at the apex of the macrocavity generating two additional horizontal microjets. The lengths of these microjets were an order of magnitude smaller than the cavity size but linearly scaled with the cavity radius. This process of microjet development is sensitive to the cavity geometry and is unlike the previously observed jetting phenomena in cavitation, impact crater collapse, or shock-induced cavity collapse.
authors.affiliation: Department of Mechanical and Aerospace Engineering, University of California, San Diego, La Jolla, California, 92093.
authors.forename: K L
authors.initials: KL
authors.lastname: Olney
authors.affiliation: Materials Science and Engineering Graduate Program, University of California, San Diego, La Jolla, California, 92093.
authors.forename: P-H
authors.initials: PH
authors.lastname: Chiu
authors.affiliation: Department of Structural Engineering, University of California, San Diego, La Jolla, California, 92093.
authors.forename: D J
authors.initials: DJ
authors.lastname: Benson
authors.affiliation: Department of Mechanical Engineering, McGill University, Quebec, H3A 0C3, Canada.
authors.forename: A
authors.initials: A
authors.lastname: Higgins
authors.affiliation: Department of Mechanical Engineering, McGill University, Quebec, H3A 0C3, Canada.
authors.forename: M
authors.initials: M
authors.lastname: Serge
authors.affiliation: Department of Mechanical and Aerospace Engineering, University of California, San Diego, La Jolla, California, 92093.|Materials Science and Engineering Graduate Program, University of California, San Diego, La Jolla, California, 92093.
authors.forename: V F
authors.initials: VF
authors.lastname: Nesterenko