Hyperelastic constitutive model parameters identification using optical-based techniques and hybrid optimisation

Abstract In this paper we propose a new optical-based technique to identify the constitutive relation coefficients of hyperelastic material using hybrid optimisation approach. This can be used in place traditional mechanical testing elastomers for applications that involve inhomogeneous deformation. The purpose proposed method is incompressible single experiment under different loading cases. comprises sample surface 3D reconstruction and uses finite element simulations replicate experiments, minimise error between actual deformations FE simulation results. predicts more accurately than other methods. study introduces novel approach by employing subpixel image registration algorithm reconstruction. requires with diverse cases determine relations. setup portable accommodated small suitcase. For purpose, an apparatus was constructed comprising stereoscopic system eight cameras six-degree-of-freedom force-torque sensor measure induced forces torques during experiments. We identified Ogden N1, N3, Yeoh, Arruda-Boyce relations which are commonly models silicone materials, uniaxial test, optical test (experiments performed system), tests. demonstrated obtained from deformation tests provided most accurate predictions. It also shown insufficient describe behaviour when undergoes deformations.