Abstract
Soft tissues, skin and rubber-like material research has gained considerable attention over the last few years. Most related research has adopted hyperelastic material models namely Mooney-Rivlin, Neo-Hookean and Ogden models. The complex behaviour (highly non-linear) makes it challenging to be analysed. Nevertheless, the fundamental understanding of a particular hyperelastic model could assist researchers to have a better judgement on their findings. Therefore, performing a parametric study is vital especially at the beginning of such numerical analysis. This study aims to investigate numerically, the contribution of material parameters of two hyperelastic constitutive models viz. Ogden and Mooney-Rivlin. This study is divided into three stages, i.e. the derivation and simplification of the hyperelastic equations, the parametric analysis of the hyperelastic models and the demonstration of the hyperelastic material parameters with respect to stress and stretch. The second stage consists of the following investigations (1. The influence of the first material parameter Constant 1, C1 and Ogden Exponent, α for Mooney-Rivlin and Ogden Model respectively; 2. The influence of the second material parameter Constant 2, C2 and Ogden Coefficient, µ for Mooney-Rivlin and Ogden Model correspondingly and 3. The influence and sensitivity of the stress levels with different stretch, . on the three-dimensional stress-stretch curve). From this parametric study, the Mooney-Rivlin Model indicates that an incompressible, isotropic Mooney-Rivlin Model is more sensitive to C1variations as compared toC2 variations. Nevertheless, the Ogden model shows results that the higher Ogden exponent influence the stress level as well as the stress-stretch curve with an accelerated stress increment at the beginning of deformation. It is also evident from the stress-stretch curves illustrated in each investigation, the hyperelastic models are sensitive towards different material coefficients.
