Abstract
Abstract A new laboratory test for evaluating groove cracking of tire treads was developed. The tread section, including the carcass of a tire, is flexed under similar stress and temperature conditions as in actual tire service. Whole or multiple tread sections may be tested. The test is much less expensive than either road or indoor wheel tests. The test gives results that are reproducible and which are in accord with actual tire performance. In SBR/BR passenger tire tread formulations, finer carbon blacks or lower structure carbon blacks produce more groove cracking in this laboratory test; trends also observed in actual service. The inhibiting effect of antioxidants on groove cracking was demonstrated. In NR/BR treads, inversion of the structure effect was observed. Evidence has also been obtained that the test is capable of correctly predicting the effect of a tread design change upon groove cracking.
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