Impact experiments. I - Ejecta velocity distributions and related results from regolith targets

Details Impact experiments. I - Ejecta velocity distributions and related results from regolith targets Impact experiments. I - Ejecta velocity distributions and related results from regolith targets

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...63...69h&link_type=abstract

Icarus (ISSN 0019-1035), vol. 63, July 1985, p. 69-98.

Computer Science

50

Ejecta, Impact Damage, Planetary Evolution, Regolith, Targets, Velocity Distribution, Craters, Evolution (Development), Experimentation, Hypervelocity Impact, Kinetic Energy, Particle Size Distribution, Scaling Laws, Solar System, Planets, Impacts, Experiments, Ejecta, Velocity, Distribution, Regolith, Experiments, Analogs, Energy, Size, Craters, Scaling, Kinetics, Shape, Ejecta Blankets, Thickness, Comparisons, Theoretical Studies, Accretion

Scientific paper

Results are reported of laboratory measurements of the velocity distributions of powdery ejecta of 14 impacts into powders simulating regolith in near vacuum. The impact velocities ranged from 5-2321 m/sec, a velocity range believed prevalent in the early solar system. The powder was mechanically similar to lunar regolith. The projectiles comprised harder materials than the regolith, i.e., pyrex spheres, basalt spheres and cylinders, and igneous rocks. High-speed photography was employed to record the events. The differences between the present results and those from hypervelocity impacts are discussed in detail. Notably, an impact velocity threshold was detected between 10-30 m/sec, below which the amount of ejecta is less than the projectile mass.

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