Sticking in moderate velocity oblique impact - Application to planetology

Details Sticking in moderate velocity oblique impact - Application to planetology Sticking in moderate velocity oblique impact - Application to planetology

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984icar...57..280l&link_type=abstract

Icarus (ISSN 0019-1035), vol. 57, Feb. 1984, p. 280-293. Research supported by the Japan Society for the Promotion of Science.

Physics

4

Hypervelocity Impact, Impact Tests, Metal Surfaces, Planetology, Protoplanets, Angles (Geometry), Evolution (Development), Iron, Lead (Metal), Solid-Solid Interfaces, Temperature Gradients, Tin, Velocity, Planets, Planetology, Cratering, Impacts, Velocity, Collisions, Mass, Experiments, Parameters, Thermal Effects, Temperature, Iron, Nickel, Magnesium Silicate, Metals, Rock, Theoretical Studies

Scientific paper

The sticking behavior of metal has been investigated experimentally. A map of sticking efficiency versus impact angle and impact velocity has been established for lead. The threshold sticking velocity for normal impact equals approximately 100 m/sec for lead, 140 m/sec for tin, and 500 m/sec for iron in the case of spherical projectiles of 8-mm diameter, and a semiinfinite target. The boundary between the plastic rebound area and the perfect sticking area is found to be a line of constant normal velocity. The case when projectile mass is equal to target mass has been investigated as well. The experimental results have been extrapolated to higher temperature and then applied to iron, nickel, and magnesium silicate. Near the melting point the sticking velocities were estimated as 250-350 m/sec for iron and nickel and about 40 percent higher for magnesium silicate. It was concluded that metals stick more easily than rocky materials because of their lower sticking velocity and much larger interval of temperature over which sticking is possible.

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