Indentification of Stress-strain Data of Rubber for Finite Element Analysis

Abstract

The stress-strain behavior of rubber is non-linear and is usually described using the strain energy density function. From the viewpoint of the input data for finite element analysis (FEA), a number of models have been proposed to describe the behavior. Therefore, it is necessary to understand the feature of the models. Namely, the selection of the models is still a difficult subject when the FEA is performed. In this paper, the authors review the optimum identifica-tion of the stress-strain data of rubber for FEA input. This technical note is the summary of the discussion in the sec-tional meeting "mechanical properties of rubber" in the society of rubber industry, Japan. Ogden and Mooney-Rivlin models guarantee a marvelous expression under sufficient testing data, although they do not give a good description under insufficient testing data. Neo-Hookean model has possibilities to give an acceptable identification result under insufficient testing data, such as only a simple tensile testing data.