Physics
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979esasp.153..101s&link_type=abstract
In ESA Comet Halley Micrometeoroid Hazard Workshop p 101-107 (SEE N80-22200 12-91)
Physics
Dynamic Characteristics, Hypervelocity Projectiles, Impact Tests, Penetration, Terminal Ballistics, Velocity Distribution, Elastic Deformation, Experiment Design, Fragmentation, Hydrodynamics, Kinetic Energy, Perforating, Plastic Deformation
Scientific paper
A variety of cratering phenomena is discussed, primarily with respect to their dependencies on impact velocity. Based on experimental evidence, three impact regimes can be established, an elastic, a plastic, and a hydrodynamic regime. Within the hydrodynamic regime, the cartering process becomes uniform and independent of the impact velocity. It is mainly controlled by projectile and target densities and by the kinetic projectile energy. For plate perforation, there exists a velocity threshold above which the perforation process becomes independent of the impact velocity. The degree of projectile fragmentation during plate perforation increases strongly with increasing velocity. A proposed penetration formula based on a single energy model was applied to a number of experimental data. This formula turned out to describe penetration depths within the hydrodynamic impact regime reasonably well up the highest impact velocities experimentally accessible.
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