Hyperelastic constitutive modeling with exponential decay and application to a viscoelastic adhesive

TL;DR

This paper introduces an extended hyperelastic model with exponential decay and viscoelastic coupling to accurately predict the mechanical behavior of polyurethane adhesives under various loading conditions.

Contribution

It proposes a novel hyperelastic model extension with exponential decay and viscoelasticity, validated through minimal testing for improved accuracy in adhesive behavior prediction.

Findings

Model accurately predicts tensile, compressive, and shear tests

Single strain rate tensile and creep tests suffice for parameter identification

Good agreement across different strain rates and test types

Abstract

Hyperelastic materials models are well established to describe the non-linear stress-strain relations of elastomers. In this paper, a polyurethane adhesive is considered as an exemplary material and subjected to tensile, compressive and shear tests. Conventional hyperelastic models are unable to capture the mechanical behaviour satisfyingly: If the model agrees with the test results at large strains, it underestimates the stiffness at low strains significantly. We propose a model extension to describe a kind of exponential decay of stiffness which bears some similarity with a specific model developed by Yeoh. The new hyperelastic model is coupled with linear viscoelasticity to account for the strain rate dependence observed for the tested material. The model parameters are identified using a tensile test at a single strain rate only and a creep test. Furthermore, the compressibility is determined by comparison of the stiffness in two butt joint tests with different aspect rations of the adhesive layer. Using this parameter set the new model provides a very good prediction of tensile, compressive and shear tests at different strain rates.