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Several gum or filler-loaded vulcanized samples were fatigued mechanically with repeating uniaxial deformations which was superposed by the constant elongation. For these fatigued samples with various periods of the repeated deformation over the range from 0 to 105, the parameters, C1, C2 and γbmax were measured. Here C1 and C2 are the coefficients of a modified form of the Mooney-Rivlin equation, and γbmax is the maximum value of the strain-at-break obtained when the strain-at-break is measured over a wide range of temperature. The same virgin samples were heat-treated at 120 °C. for various periods of time ranging from 0 to 72 hours, and the same parameters were measured for them. As a result, change in these parameters with the increase in periods of repeated deformation or periods of heat treatment was rather irregular. But the change in γbmax, only in case of heat-treated samples was exponentialdecrease with increase in periods of heat treatment.
日本ゴム協会の論文