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Acoustic fluidization and the scale dependence of impact crater morphologyA phenomenological Bingham plastic model has previously been shown to provide an adequate description of the collapse of impact craters. This paper demonstrates that the Bingham parameters may be derived from a model in which acoustic energy generated during excavation fluidizes the rock debris surrounding the crater. Experimental support for the theoretical flow law is presented. Although the Bingham yield stress cannot be computed without detailed knowledge of the initial acoustic field, the Bingham viscosity is derived from a simple argument which shows that it increases as the 3/2 power of crater diameter, consistent with observation. Crater collapse may occur in material with internal dissipation Q as low as 100, comparable to laboratory observations of dissipation in granular materials. Crater collapse thus does not require that the acoustic field be regenerated during flow.
Document ID
19830040099
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Melosh, H. J.
(Arizona, University Tucson, AZ, United States)
Gaffney, E. S.
(Los Alamos National Laboratory Los Alamos, NM, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Subject Category
Lunar And Planetary Exploration
Meeting Information
Meeting: Lunar and Planetary Science Conference
Location: Houston, TX
Start Date: March 15, 1982
End Date: March 19, 1982
Accession Number
83A21317
Funding Number(s)
CONTRACT_GRANT: NAGW-50
CONTRACT_GRANT: W-7405-ENG-36
Distribution Limits
Public
Copyright
Other

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