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The dynamic properties of an elastomer can best be exhibited by examination of the response of a specimen under a sinusoidal oscillation. The elastic component of the elastomer is responsible for the in-phase stress, while the viscous component is responsible for the out-of-phase stress. The amount by which the strain response lags the resultant of the two stresses (in-phase and out-of-phase) is known as the phase or loss angle, δ. The more viscous an elastomer, the greater the phase or loss angle. The tangent of this angle "tan delta" in the simplest terms, is the ratio of the viscous modulus to the elastic modulus. Modes of Operation
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