ON THE MULTIAXIAL AMPLITUDE- AND FREQUENCY-DEPENDENT BEHAVIOR OF RUBBER: EXPERIMENTS AND CONSTITUTIVE MODELING

Abstract

ABSTRACT A phenomenological hyperviscoelastic model is proposed. This model describes the multiaxial amplitude- and frequency-dependent behavior of the material. Moreover, thanks to the definition of new internal variables, the model is able to take into account the Payne effect. The experimental results of a characterization campaign performed on a butadiene rubber filled with carbon black particles are then presented. These tests were conducted under tension/compression and simple shear at several frequencies and amplitudes. Using these experimental data, a fast and robust method is presented to identify the material parameters. There are two steps in this method: the first step regards the hyperelastic behavior and the second step the viscous behavior. The identified model provides good correlations with the tests for describing the dynamical effects under both shear and tension loads.