Abstract
An oscilloscopic method for determining the coefficient of restitution, \ie, by impact of spheres on ice was developed. Teflon, acrylic, nylon, and steel spheres having 1/4-in., 1/2-in., 3/4-in., and 1-in. diameter were used. The experiments were conducted at -1°C, -10°C, and -20°C, respectively. With the exception of Teflon spheres, the coefficient of restitution is found to decrease with the diameter of the sphere and increase as the temperature is lowered. All the data can be well represented by an exponential expression in terms of impact velocity \IV\di\N in a form of \ie = \iA exp (-\IB V\di\N) with correlation coefficients in the range of 0.91 to 0.99. The occurrence and extent of ice cracking were found to depend on the sphere material, diameter, temperature, and impact velocity.
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