Nonlinear Anelastic Behavior of a Synthetic Rubber at Finite Strains,

Abstract
A set of constitutive equations has been developed to represent nonlinear anelastic behavior, i.e. energy losses and rate dependent moduli for geometrically large, reversible deformations. These equations are in incremental form and can be used to solve boundary value problems by numerical methods. Two problems were considered: thick walled spheres subjected to cycles of internal pressure, and a long rod subjected to imposed axial velocity (the simple tension test). Experiments were carried out for both conditions on specimens made of a synthetic rubber at three different temperatures (each under isothermal conditions) and at different loading rates. Response curves were calculated based on the constitutive equations and chosen values of the material constants. Generally good agreement was obtained between the predicted and experimental results. (Author)

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