, /1) in order to obtain the failure stresses under a wide range of loading conditions. The strains are measured in the central zone using the Digital Image Correlation technique until the failure of the composite. Based on the measured strains and the material properties, the stresses are calculated using the constitutive equations. The tensile/tensile quadrant of the failure envelop is generated and compared to

Y. S. Shin, Introduction to Composite Materials. U.S. army armament research and development center, 1984.

D. Van-hemelrijck, A. Makris, C. Ramault, E. Lamkanfi, W. Van-paepegem et al., Biaxial testing of fibre-reinforced composite laminates, Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications, vol.222, issue.4, pp.231-239, 2008.

A. S. Chen and F. L. Matthews, A review of multiaxial/biaxial loading tests for composite materials, Composites, vol.24, issue.5, pp.395-406, 1993.

N. I. Aniskevich, A. A. Malmeister, and Y. O. Yanson, Method of testing tubular specimens of polymer materials in the complex stressed state under temperature-effect conditions, Mechanics of Composite Materials, vol.20, issue.1, pp.118-122, 1984.

M. F. Al-khalil, P. D. Soden, R. Kitching, and M. J. Hinton, The effects of radial stresses on the strength of thin-walled filament wound GRP composite pressure cylinders, International Journal of Mechanical Sciences, vol.38, issue.1, p.27, 1995.

V. K. Choo and D. Hull, Influence of Radial Compressive Stress Owing to Pressure On the Failure Modes of Composite Tube Specimens, vol.17, pp.344-356, 1983.

R. Xiao, A Review of Cruciform Biaxial Tensile Testing of Sheet Metals, Exp Tech, 2019.

K. J. Pascoe and J. W. De-villiers, Low cycle fatigue of steels under biaxial straining, Journal of Strain Analysis, vol.2, issue.2, pp.117-126, 1967.

I. Zidane, D. Guines, L. Léotoing, and E. Ragneau, Development of an in-plane biaxial test for forming limit curve (FLC) characterization of metallic sheets, Meas. Sci. Technol, vol.21, issue.5, p.55701, 2010.
URL : https://hal.archives-ouvertes.fr/hal-00981719

W. Liu, D. Guines, L. Leotoing, and E. Ragneau, Identification of sheet metal hardening for large strains with an in-plane biaxial tensile test and a dedicated cross specimen, International Journal of Mechanical Sciences, pp.387-398, 2015.
URL : https://hal.archives-ouvertes.fr/hal-01203625

, International Standard ISO 16842. Metallic materials -sheet and strip -biaxial tensile testing method using a cruciform test piece, 2014.

H. Thom, A review of the biaxial strength of fibre-reinforced plastics, Composites Part A: Applied Science and Manufacturing, vol.29, issue.8, pp.869-886, 1998.

P. Hopgood, J. Cook, and A. Clarke, Multi-axial testing of planar composite specimens, Proceedings of the 12th International Conference on Composite Materials, 1999.

C. Williamson and J. Thatcher, Investigation Into the Failure of Open Holes in Cfrp Laminates Under Biaxial Loading Conditions, Experimental Analysis of Nano and Engineering Materials and Structures, E. E. Gdoutos, 2007.

D. A. Arellano-escarpita, D. Cardenas, H. Elizalde, R. Ramirez, and O. Probst, Biaxial Tensile Strength Characterization of Textile Composite Materials, Composites and Their Properties, 2012.

J. S. Welsh and D. F. Adams, An experimental investigation of the biaxial strength of IM6/3501-6 carbon/epoxy cross-ply laminates using cruciform specimens, Composites Part A: Applied Science and Manufacturing, vol.33, issue.6, pp.829-839, 2002.

J. S. Welsh, Experimental and Numerical Failure Predictions of Biaxially Loaded Quasi-isotropic Carbon Composites, 16th International Conference on Composite Materials, 2007.

A. Smits, D. Van-hemelrijck, T. P. Philippidis, and A. Cardon, Design of a cruciform specimen for biaxial testing of fibre reinforced composite laminates, Composites Science and Technology, vol.66, issue.7-8, pp.964-975, 2006.

A. Makris, C. Ramault, D. V. Hemelrijck, E. Lamkanfi, and W. V. Paepegem, Biaxial Failure Envelopes for Glass Fibre Reinforced Composite Laminates, p.12, 2009.

A. Makris, C. Ramault, D. V. Hemelrijck, E. Lamkanfi, and W. V. Paepegem, Damage evolution on composite cruciform specimens under quasi-static biaxial loading, 17th International Conference on Composite Materials, 2009.

C. Ramault, E. Lamkanfi, and W. V. Paepegem, Effect of tab design on the strain distribution of a biaxially loaded cruciform composite specimen, 17th International Conference on Composite Materials, 2009.

E. Lamkanfi, W. Van-paepegem, J. Degrieck, C. Ramault, A. Makris et al., Strain distribution in cruciform specimens subjected to biaxial loading conditions. Part 2: Influence of geometrical discontinuities, Polymer Testing, vol.29, issue.1, pp.132-138, 2010.

J. Ash and J. Welsh, Biaxial Strength Measurements of IM7/977-2 Carbon/Epoxy Laminates Using Tabbed Cruciform Specimens, 45th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics & Materials Conference, 2004.

A. S. Torres and A. K. Maji, The development of a modified bi-axial composite test specimen, Journal of Composite Materials, vol.47, issue.19, pp.2385-2398, 2013.

M. J. Hinton, A. S. Kaddour, and P. D. Soden, Failure Criteria in Fibre Reinforced Polymer Composites: The World-Wide Failure Exercice 1st edition, p.29, 2004.

A. Kobeissi, L. Leotoing, D. Guines, and P. Rahme, Numerical Investigation on Composite Cruciform Shape for the Biaxial Characterization Test, Proceedings of the 18th European Conference on Composite Materials, 2018.
URL : https://hal.archives-ouvertes.fr/hal-01863259

J. S. Welsh, J. S. Mayes, C. T. Key, and R. N. Mclaughlin, Comparison of MCT Failure Prediction Techniques and Experimental Verification for Biaxially Loaded Glass Fabric-reinforced Composite Laminates, Journal of Composite Materials, vol.38, issue.24, pp.2165-2181, 2004.

M. J. Hinton, A. S. Kaddour, and P. D. Soden, A comparison of the predictive capabilities of current failure theories for composite laminates, judged against experimental evidence, Composites Science and Technology, vol.62, pp.1725-1797, 2002.

C. T. Sun, B. J. Quinn, J. Tao, and D. W. Oplinger, Comparative Evaluation of Failure Analysis Methods for Composite Laminates, NASA, 1996.

C. B. Norris, Strength of orthotropic materials subjected to combined stress, Laboratory report 1816, 1962.