Evaluating of hyperelastic material behavior

Abstract

Nowadays one of the most used method able to solve non-linear problems is finite-elemnt method. Mooney-Rivlin is the method describing the behaviour of hyperelastic materials with large elastic (reversible) deformations. The problem with the determining the hyperelastic materials' characteristics is one of the most important factors effecting the accuracy of the calculation result. The material's constants A and B are determined experimentally from the practical tests. This paper shows the possibility how to determinate these materials' characteristics and their verification with help of ABAQUS. The material coefficients of the hyperelastic models can be calibrated by ABAQUS from experimental stress-strain data. The material constants are determined through a least-squares-fit procedure, which minimizes the relative error in stress. We provided experimental data from uniaxial test for chosen material are used to have ABAQUS automatically determine appropriate values of the coefficients.