STRAIN RATE DEPENDENCY OF NEOHOOKEAN MATERIAL USING KELVIN-VOIGT VISCOELASTIC MODEL

Abstract

This research paper examines the strain rate dependency of a Neo-Hookean material using the Kelvin-Voigt viscoelastic model. The Neo-Hookean model is widely used to describe the mechanical behavior of rubber-like materials, but it fails to consider the timedependent response observed in many materials. To overcome this limitation, the Kelvin-Voigt viscoelastic model, which incorporates a viscosity term into the NeoHookean model, is employed to capture the strain rate dependency. The paper commences by introducing the Neo-Hookean material model and its assumptions. It then elucidates the rationale behind incorporating the Kelvin-Voigt model to account for the time-dependent behavior. To validate the strain rate dependency of the KelvinVoigt model, tensile test is performed using experimental data. The experimental data comprises stress-strain curves, from which the material parameters of both the Neo-Hookean and Kelvin-Voigt models are determined using curve-fitting techniques. The study presents and analyzes the results, with a specific focus on the material's strain rate sensitivity. The stress-strain curves obtained from the Kelvin-Voigt model are compared with the experimental data, and the model's accuracy is evaluated. Additionally, the material parameters obtained from the curve-fitting process are examined to explore the influence of strain rate on the mechanical response of the material.