Abstract
The stress relaxation behavior of a carbon-black-filled elastomer is shown to be independent of the state of deformation, and the temperature dependence of its static modulus is in good accord with that predicted by the statistical theory of elasticity. The storage and loss moduli are found to be separable functions of frequency and overall strain effects in both simple tension and pure shear. A separability of static deformational and dynamic strain amplitude effects is found for the storage modulus, but could not be determined for the loss modulus. However, the loss tangent is found to be a function of the static state of deformation. From these experimental results, it is shown that an existing viscoelasticity theory for an unfilled system when specialized to uniaxial extensions has a form which can be made suitable for representing the dynamic behavior of filled systems by the introduction of two functions of the dynamic strain amplitude.
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