Fine fragments in high-velocity impact experiments

Details Fine fragments in high-velocity impact experiments Fine fragments in high-velocity impact experiments

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....9012445a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Dec. 10, 1985, p. 12,445-12,453.

Physics

27

Cratering, Ejecta, Hypervelocity Impact, Impact Damage, Basalt, Kinetic Energy

Scientific paper

Fine fragments ejected with very high velocity immediately after a high-velocity impact are one of the most important constituents of the material observed as a result of impact phenomena. Drawbacks regarding the employment of a high-speed camera in the study of the kinematics of fine fragments are related to the image resolution which is not good enough to reveal the properties of individual particles. In the reported study, alternative methods were used. In the experiments, spherical nylon projectiles with a diameter of 7 mm were fired at the target by making use of a two-stage light-gas gun facility. Cubic basaltic rock targets of a density of 2660 kg/(cu m) were employed. The grain sizes of the constituent minerals in the target rock were in the range from 30 to 300 microns. Attention is given to the size spectra of the fine fragments, the distributions of microcrater diameters on secondary targets, energy partitioning, and the injection angles for the high-velocity fine fragments.

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