Laboratory simulation of planetesimal collision. II - Ejecta velocity distribution

Details Laboratory simulation of planetesimal collision. II - Ejecta velocity distribution Laboratory simulation of planetesimal collision. II - Ejecta velocity distribution

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.1995w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Feb. 10, 1985, p. 1995-2011.

Astronomy and Astrophysics

Astrophysics

15

Collision Parameters, Ejecta, Protoplanets, Space Environment Simulation, Basalt, Impact Damage, Photographic Recording, Rock Mechanics, Steels, Velocity Distribution, Planets, Planetesimals, Simulations, Collisions, Ejecta, Velocity, Distribution, Fragments, Impacts, Energy, Strain, Fracturing, Mass, Ejection, Mechanical Properties, Formation

Scientific paper

The distribution of ejecta velocities produced by low-velocity impact of mild steel against rock was experimentally investigated using a powder gun and a high frame rate camera. Catastrophic destruction of targets started with longitudinal splitting, which appears to be caused by the same fracture mechanism that occurs in uniaxial static compression. For such splitting, the lateral ejection velocity component is about 20 m/s for basalt and about 5 m/s for tuff. The peak stress generated at the impact site is a major parameter for defining the boundaries between the regimes of rebound and initiation of target destruction, while the imparted energy density is a good parameter for defining the boundaries between longitudinal splitting and catastrophic destruction. Ejection velocities are much higher for rock-rock collisions than for steel-rock collisions, even when the impact velocity is the same. For rock-rock collisions, ejecta velocities are almost identical to the impact velocity.

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