Abstract
An experimental and theoretical investigation of the elastic normal impact of spheres on thick plates has been carried out. The coefficient of restitution has been measured very carefully by observing the flight times of successive bounces of balls on glass plates and the displacements at the bottom face have been accurately measured with a laser heterodyne optical interferometer. The analysis along the axis of impact has shown two unexpected phenomena, namely the propagation of a longitudinal displacement at the shear wave velocity and an enhancement of the amplitude of the reflected “P” wave at the free surface of the plate. Both of these have been confirmed experimentally.
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