M. &. Grédiac and . Pierron, At-shaped specimen for the direct characterization of orthotropic materials, International Journal for Numerical Methods in Engineering, vol.41, issue.2, pp.293-309, 1998.

M. Grédiac, E. Toussaint, and &. F. Pierron, Special virtual fields for the direct determination of material parameters with the virtual fields method. 1--principle and definition, International Journal of Solids and Structures, vol.39, issue.10, pp.2691-2705, 2002.

T. Guélon, E. Toussaint, J. Cam, N. Promma, and &. M. Grédiac, A new characterization method for rubbers, Polymer Testing, vol.28, pp.715-723, 2009.

M. Johlitz and &. S. Diebels, Characterisation of a polymer using biaxial tension tests. part i: Hyperelasticity, Arch Appl. Mech, vol.81, pp.1333-1349, 2011.

A. Marek, F. M. Davis, and &. F. Pierron, Sensitivitybased virtual fields for the non-linear virtual fields method, Computational Mechanics, vol.60, issue.3, pp.409-431, 2017.

A. Marek, F. M. Davis, M. Rossi, and &. F. Pierron, Extension of the sensitivity-based virtual fields to large deformation anisotropic plasticity, International Journal of Material Forming, pp.1-20, 2018.

M. Mooney, A theory of large elastic deformation, Journal of applied physics, vol.11, issue.9, pp.582-592, 1940.

R. W. Ogden, Large deformation isotropic elasticity-on the correlation of theory and experiment for incompressible rubberlike solids, Proc. R. Soc. Lond. A, vol.326, pp.565-584, 1567.

F. &. Pierron and . Grédiac, The virtual fields method: extracting constitutive mechanical parameters from fullfield deformation measurements, 2012.

N. Promma, B. Raka, M. Grediac, E. Toussaint, J. Cam et al., Application of the virtual fields method to mechanical characterization of elastomeric materials, International Journal of Solids and Structures, vol.46, issue.3-4, pp.698-715, 2009.
URL : https://hal.archives-ouvertes.fr/hal-00322526

H. Seibert, T. Scheffer, and &. S. Diebels, Biaxial testing of elastomers -experimental setup, measurement and experimental optimisation of specimen?s shape, pp.81-72, 2014.

E. Toussaint, M. Grédiac, and &. F. Pierron, The virtual fields method with piecewise virtual fields, International Journal of Mechanical Sciences, vol.48, issue.3, pp.256-264, 2006.

P. Vacher, S. Dumoulin, F. Morestin, and &. S. Mguil, Bidimensional strain measurement using digital images, Proceedings of the Institution of Mechanical Engineers, vol.213, pp.811-817, 1999.

O. H. Yeoh, Some forms of the strain energy function for rubber, Rubber Chemistry and Technology, vol.66, issue.5, pp.754-771, 1993.

O. C. Zienkiewicz, R. L. Taylor, O. C. Zienkiewicz, and &. R. Taylor, The finite element method, vol.36, 1977.

, Figure 7. Force obtained from finite element simulations compared to experimental force