Seleção de um modelo de material hiperelástico para a análise de elementos finitos de um coxim automotivo de borracha

Abstract

The nonlinear stress-strain (S-e) relations are required for the finite element analysis (FEA) of elastomeric components. These materials’ response curves are obtained by a series of experiments, mostly tensile and compression tests. Numerous constitutive equations of this class of material are presented in literature. In this work, tensile and compression tests were performed on natural rubber (NR-60) specimens to determine the material constants of multiple constitutive models. In addition, with the aid of experimental bench tests, the load-displacement curve of an automotive rubber mount subjected to a unidirectional load was obtained. In the last step, the material constants were used as input in Abaqus® software, to perform a finite-element analysis of the rubber mount behavior and determine which strain energy model produced the least amount of relative error. The methodology applied in the present study revealed that the Arruda-Boyce and Neo-Hookean constitutive models were the most adequate to reproduce the force-displacement behavior of the rubber mount in 3D finite element simulations.