Mathematics
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994p%26ss...42.1043n&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 42, no. 12, p. 1043-1052
Mathematics
20
Ejecta, Experiment Design, Fragments, Hypervelocity Impact, Lunar Craters, Mathematical Models, Size (Dimensions), Velocity Distribution, Asteroids, Basalt, Foils, Hypervelocity Projectiles, Nylon (Trademark), Targets, Thin Films
Scientific paper
We describe the method and the result of a new experiment to obtain velocity distribution of fine ejecta fragments, from a few to a hundred microns in size, produced from basalt targets by impacts of nylon projectiles at a velocity of 3.7 km/s. The size distribution of holes perforated by the ejecta fragments on thin films and foils placed around the targets was investigated, and the size-velocity relation was determined with the aid of an empirical formula for threshold penetration (McDonnell and Sullivan, Unit for Space Sciences, University of Kent, 1992). The velocity of the fastest fragments, at a given size, is from the extrapolation of the size-velocity relation for 1-100 mm fragments (Nakamura and Fujiwara, (1991); Nakamura et al., (1992)). The laboratory results are also compared with those obtained from the study of secondary craters around large lunar craters (Vickery, (1986), (1987)). All these data provide a smooth size-velocity relationship in the normalized fragment size range of four orders of magnitude.
Fujiwara Akira
Kadono Toshihiko
Nakamura Akiko M.
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