Experimental determination of the coefficient of restitution for meter-scale granite spheres

Details Experimental determination of the coefficient of restitution for meter-scale granite spheres Experimental determination of the coefficient of restitution for meter-scale granite spheres

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011icar..211..849d&link_type=abstract

Icarus, Volume 211, Issue 1, p. 849-855.

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Scientific paper

We present results of a series of large-scale experiments to measure the coefficient of restitution for 1-m-diameter rocky bodies in impacts with collision speeds up to ˜1.5 m s-1. The experiments were conducted in an outdoor setting, with two 40-ton cranes used to suspend the ˜1300-kg granite spheres pendulum-style in mutual contact at the bottoms of their respective paths of motion. The spheres were displaced up to ˜1 m from their rest positions and allowed to impact each other in normal-incidence collisions at relative speeds up to ˜1.5 m s-1. Video data from 66 normal-incidence impacts suggest a value for the coefficient of restitution of 0.83 ± 0.06 for collisions between ˜1-m-scale spheres at speeds of order 1 m s-1. No clear trend of coefficient of restitution with impact speed is discernable in the data.

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