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Impact Cratering CalculationsWe examined the von Mises and Mohr-Coulomb strength models with and without damage effects and developed a model for dilatancy. The models and results are given in O'Keefe et al. We found that by incorporating damage into the models that we could in a single integrated impact calculation, starting with the bolide in the atmosphere produce final crater profiles having the major features found in the field measurements. These features included a central uplift, an inner ring, circular terracing and faulting. This was accomplished with undamaged surface strengths of approximately 0.1 GPa and at depth strengths of approximately 1.0 GPa. We modeled the damage in geologic materials using a phenomenological approach, which coupled the Johnson-Cook damage model with the CTH code geologic strength model. The objective here was not to determine the distribution of fragment sizes, but rather to determine the effect of brecciated and comminuted material on the crater evolution, fault production, ejecta distribution, and final crater morphology.
Document ID
20020011680
Acquisition Source
Goddard Space Flight Center
Document Type
Contractor or Grantee Report
Authors
Ahrens, Thomas J. (California Inst. of Tech. Pasadena, CA United States)
Date Acquired
September 7, 2013
Publication Date
December 17, 2001
Subject Category
Astrophysics
Report/Patent Number
CIT-TJA.00005-1-NASA.000026
Funding Number(s)
CONTRACT_GRANT: NAG5-8915
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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