Ogden and Mooney-Rivlin hyperelastic models comparison in porcine lobular tissue

Pigs are one of the most widely used animal models for research due to their similarity to humans, and one of the models of choice for skin research. In this article, we worked with porcine earlobe skin, characterized for a uniaxial tensile test in a universal mechanical test machine (Cellscale® Univert). The data obtained from the uniaxial tensile test were fitted to constitutive models for stress derived from the Ogden and Mooney-Rivlin stress-energy density function. The parameters for the Ogden and Mooney-Rivlin hyperelastic models were calibrated using the least squares optimization of Levenberg–Marquardt. In this study, the first constitutive model of the porcine earlobe was established, the model demonstrates the anisotropy of the tissue. This is seen in the classic J-shape, which characterizes soft tissues. These data will be valuable as a reference point for future animal studies, and provide information for pig skin models.