AbstractThe reinforcement effect of carbon black and, the effect of accelerator‐to‐sulfur ratio variation on the elastic behavior of natural rubber vulcanizates have been studied. The Mooney–Rivlin relation was used to describe the behavior of the rubber matrix, and values of constantsc1andc2have been evaluated with the use of the strain‐amplification factor. The stress softening of the vulcanizates tested has also been e
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