Abstract
AbstractBiaxial stress relaxation data acquired for a carbon‐black‐filled elastomer are analyzed. Consistent with previously published simple‐tension and pure‐shear results for this elastomer, the biaxial relaxation behavior is also found to be a separable function of time and strain effects. A departure from separability is observed at the larger strain; this might be a manifestation of strain‐induced crystallization. An analysis of the biaxial results together with the earlier reported simple‐tension and pure‐shear data reveals that the deformational dependence of this elastomer obeys the Valanis—Landel hypothesis up to moderate deformations. The Ogden strain energy function is found to be an excellent analytical representation of all of the multiaxial data. Large relative errors found at small tensile strains between the data and the Ogden fit are attributed to carbon black structural effects.
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