Calculational investigation of impact cratering dynamics - Early time material motionsEarly time two-dimensional finite difference calculations of laboratory-scale hypervelocity (6 km/sec) impact of 0.3 g spherical 2024 aluminum projectiles into homogeneous plasticene clay targets were performed and the resulting material motions analyzed. Results show that the initial jetting of vaporized target material is qualitatively similar to experimental observation. The velocity flow field developed within the target is shown to have features quite similar to those found in calculations of near-surface explosion cratering. Specific application of Maxwell's analytic Z-Model (developed to interpret the flow fields of near-surface explosion cratering calculations), shows that this model can be used to describe the flow fields resulting from the impact cratering calculations, provided that the flow field center is located beneath the target surface, and that application of the model is made late enough in time that most of the projectile momentum has been dissipated.
Document ID
19800039549
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Thomsen, J. M. (Physics International Corp. San Leandro, CA, United States)
Austin, M. G. (Physics International Corp. San Leandro, CA, United States)
Ruhl, S. F. (Physics International Co. San Leandro, Calif., United States)
Schultz, P. H. (Lunar and Planetary Institute Houston, Tex., United States)
Orphal, D. L. (California Research and Technology, Inc. Livermore, Calif., United States)