Z-model analysis of impact cratering - An overviewThe Maxwell Z-Model has been applied to two continuum mechanics computer calculations: (1) a laboratory-scale impact of an aluminum projectile into plasticene clay, and (2) a planetary-scale impact of an iron meteor into gabbroic anorthosite. The material flow in the cratering flow field may be well approximated by incompressible flow for most of the excavation stage of crater growth. The center of the flow field is located beneath, not at, the surface. Soon after energy partitioning is complete, Z can assume values less than 2.0 associated with the initial directedness of the projectile's momentum. The Z-Model parameters are time dependent during a significant portion of the crater growth time, and Z increases steadily with time from about 2.0 or slightly less at the beginning of the excavation stage to level off at values in the neighborhood of about 3.0 before the excavation stage is half-over.
Document ID
19820055514
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Austin, M. G. (Physics International Corp. San Leandro, CA, United States)
Thomsen, J. M. (Physics International Corp. San Leandro, CA, United States)
Ruhl, S. F. (Physics International Co. San Leandro, CA, United States)
Orphal, D. L. (Physics International Corp. San Leandro, CA, United States)
Borden, W. F. (Physics International Corp. San Leandro, CA, United States)
Larson, S. A. (California Research and Technology, Inc. Livermore, CA, United States)
Schultz, P. H. (Lunar and Planetary Institute Houston, TX, United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1981
Subject Category
Lunar And Planetary Exploration
Meeting Information
Meeting: Multi-ring basins: Formation and evolution