The diameter of the circular contact region formed between a smooth rubber sphere and a glass plate has been studied as a function of time under a variety of loading conditions. Theoretically, the system is viewed as a circular crack which can move through the glass-rubber interface in two directions: one to form the contact and the other to break it. Discussion centres principally on the speed at which the crack propagates, and on a sudden stopping of the crack which leads to adhesive hysteresis.
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K. Kendall (1975) studied this question.
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