Abstract

E xperiments were conducted to observe plate waves travelling in polymethylmethacrylate, polyethylene, and glass plates of various thicknesses at several distances of wave travel, when the plates have been subjected to a transverse surface impact by a steel ball. It has been shown that if Poisson's ratio is taken to be a real constant, the shapes of the plate waves can be calculated when the initial disturbance and the viscoelastic properties of the medium are known. It was found possible to predict quite well the shape of the plate waves observed in the experiments. The plate waves were shown, both theoretically and experimentally, to be of a different character than those observed on the free surfaces of large block materials. The effect of the height of ball drop and contacting ball radius on pulse shape was noted.

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