Experimental studies on the impact properties of water ice

Details Experimental studies on the impact properties of water ice Experimental studies on the impact properties of water ice

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pggp.rept...60b&link_type=abstract

In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986 p 60-61 (SEE N87-23341 16-91)

Physics

Geophysics

Collisions, Ice, Impact, Particle Size Distribution, Surface Properties, Cryostats, Curvature, Low Temperature Tests

Scientific paper

Experimental studies on the impact of ice particles at very low velocity were continued. These measurements have applications in the dynamics of Saturn's rings. Initially data were obtained on the coefficient of restitution for ice spheres of one radius of curvature. The type of measurements were expanded to include restitution data for balls with a variety of surfaces as well as sticking forces between ice particles. Significant improvements were made to this experiment, the most important being the construction of a new apparatus. The new apparatus consists of a smaller version of the disk pendulum and a stainless steel, double-walled cryostat. The apparatus has proved to be a significant improvement over the old one. Measurements can now be made at temperatures near 90 K, comparable to the temperature of the environment of Saturn's rings, and with much greater temperature stability. It was found that a roughened contact surface or the presence of frost can cause a much larger change in the restitution measure than the geometrical effect of the radius of curvature.

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