Numerical Evaluation of Hyperelastic Model for Elastomer under Uniaxial Tension

摘要

Elastomer is a hyperelastic material having the ability to withstand very large strains without permanent deformation which makes it ideal for many applications. Two parameter Mooney-Rivlinmethod is the simplest method to simulate the material behavior of hyperelastic material. Determination of hyperelastic material characteristics is important to account for material non linearity in numerical calculations. The Mooney-Rivlin Constants can be determined from the experimental stress - strain curves. In this work, a rubber compound is taken for study which is used in O-rings. To determine the validated Mooneyrivlin constants, an experimental stress - strain curve is obtained from the uni-axial tensile test. Using this curve the constants are determined by adopting linear regression and least square fitting techniques. To verify these constants non linear FEA is conducted including both material and geometrical non linearity. Finally the numerical stress - strain curve is compared with experimental stress - strain curve.