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Record Details

Record 5 of 2291
Microcraters formed in glass by projectiles of various densities
Author and Affiliation:
Vedder, J. F.
Mandeville, J.-C.(NASA Ames Research Center, Moffett Field, Calif., United States)
Abstract: An experiment was conducted investigating the effect of projectile density on the structure and size of craters in soda lime glass and fused quartz. The projectiles were spheres of polystyrene-divinylbenzene (PS-DVB), aluminum, and iron with velocities between 0.5 and 15 km/sec and diameters between 0.4 and 5 microns. The projectile densities spanned the range expected for primary and secondary particles of micrometer size at the lunar surface, and the velocities spanned the lower range of micrometeoroid velocities and the upper range of secondary projectile velocities. There are changes in crater morphology as the impact velocity increases, and the transitions occur at lower velocities for the projectiles of higher density. The sequence of morphological features of the craters found for PS-DVB impacting soda lime glass for increasing impact velocity, described in a previous work (Mandeville and Vedder, 1971), also occurs in fused quartz and in both targets with the more dense aluminum and iron projectiles. Each transition in morphology occurs at impact velocities generating a certain pressure in the target. High density projectiles require a lower velocity than low-density projectiles to generate a given shock pressure.
Publication Date: Aug 10, 1974
Document ID:
19740057369
(Acquired Dec 04, 1995)
Accession Number: 74A40119
Subject Category: STRUCTURAL MECHANICS
Document Type: Journal Article
Publication Information: Journal of Geophysical Research; p. Aug. 10; 79
Publisher Information: United States
Financial Sponsor: NASA; United States
Description: 10p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: GEOMORPHOLOGY; LUNAR SURFACE; MICROMETEOROIDS; PROJECTILE CRATERING; GLASS; HYPERVELOCITY IMPACT; HYPERVELOCITY PROJECTILES; MECHANICAL SHOCK; PARTICLE DENSITY (CONCENTRATION); QUARTZ; SHOCK LOADS
Imprint And Other Notes: Journal of Geophysical Research, vol. 79, Aug. 10, 1974, p. 3247-3256.
Miscellaneous Notes: 1974, p. 3247-3256
Availability Source: Other Sources
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