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Impact cratering and spall failure at gabbroBoth hypervelocity impact and dynamic spall experiments were carried out on a series of well-indurated samples of gabbro. The impact experiments carried out with 0.04 to 0.2g, 5-6 km/sec projectiles produced deci-centimeter-sized craters and demonstrated crater efficiencies of 6/10 to the - 9 g/erg, and order of magnitude greater than in metal and some two to three times that of previous experiments on less strong igneous rocks. Most of the crater volume (some 60 to 80%) is due to spall failure. Distribution of cumulative fragment number, as a function of mass of fragments with masses greater than 0.1 gram yield values of b = d(log10N sub f)dlog10(m)of -0.5 to -0.6, where N sub f is the cumulate number of fragments and m is the mass of fragments. These values are in agreement or slightly higher than those obtained for less strong rocks and indicate that a large fraction of the ejectra resides in a few large fragments.
Document ID
19840005636
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Lange, M. A. (California Inst. of Tech. Pasadena, CA, United States)
Ahrens, T. J. (California Inst. of Tech. Pasadena, CA, United States)
Boslough, M. B. (California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
September 4, 2013
Publication Date
January 1, 1983
Subject Category
Geophysics
Report/Patent Number
NAS 1.26:174618
NASA-CR-174618
Accession Number
84N13704
Funding Number(s)
CONTRACT_GRANT: NGL-05-002-105
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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