Computer Science – Performance
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept..342s&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 342-343 (SEE N92-10728 01-91)
Computer Science
Performance
Cratering, Hypervelocity Impact, Meteorite Craters, Planetary Surfaces, Projectiles, Targets, Brittleness, Ductility, Failure Modes, Lunar Surface, Mars Surface, Performance Tests
Scientific paper
Although vertical hypervelocity impacts result in the annihilation (melting/vaporization) of the projectile, oblique impacts (less than 15 deg) fundamentally change the partitioning of energy with fragments as large as 10 percent of the original projectile surviving. Laboratory experiments reveal that both ductile and brittle projectiles produce very similar results where limiting disruption depends on stresses proportional to the vertical velocity component. Failure of the projectile at laboratory impact velocities (6 km/s) is largely controlled by stresses established before the projectile has penetrated a significant distance into the target. The planetary surface record exhibits numerous examples of oblique impacts with evidence fir projectile failure and downrange sibling collisions.
Gault Donald E.
Schultz Peter H.
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