On the nonlinear viscoelastic behavior of soft biological tissues.

Abstract Two approximate constitutive equations which have proved useful for characterizing the nonlinear viscoelastic behavior of polymers are proposed as candidate theories to characterize soft biological tissues. The equivalence of these theories with one form of the Fung equation for stress relaxation is demonstrated. It is shown that different results are predicted for constant strain rate tests for data presented by Haut and Little (1972) for collagen fibers.

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