AbstractThe applicability of Hertz's theory of impact to the case of rigid spheres colliding with rubber has been studied over a wide range of impact conditions. In general, the theory is adequate; but in many practical cases, the influence of the finite thickness of the sample is significant. Using previously published data on the influence of thickness on static indentation measurements, this effect can be predicted and good agreement with experiment is found. Resilience measurements have been made over a range of impact conditions. The time of impact, rather than its severity as such, was found to be the factor governing the resilience for the unfilled materials studied, provided that there was no slip of the sample relative to its holder. Slippage can occur if the sample is too thin, due to the shear stresses developed at the rear surface, and this results in the observed resilience being anomalously low.
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