ABSTRACT
When the current state of stress of a material depends on both its current rate of deformation and its past history of deformation, the material is said to be viscoelastic. When a material is only slightly perturbed from its equilibrium state it generally exhibits a type of behavior called linear viscoelasticity, for which the rheological material functions are independent of strain amplitude. Curves of frequency-dependent storage modulus,
G
′
(
ω
) and loss modulus,
G
″
(
ω
) are commonly used to describe linear viscoelastic behavior.
