In this study, the biaxial Iosipescu test fixture has been employed to determine the failure properties of a unidirectional carbon-epoxy composite subjected to combined shear and transverse tensile stresses. The range of possible biaxial stress states has been extended by varying the fiber orientations in the Iosipescu specimens. Results obtained from the shear tests conducted using the biaxial Iosipescu test fixture have been compared with independent Iosipescu tests conducted at the University of Idaho, and with the 100 off-axis tension test. It is found that the Iosipescu shear testing of specimens with a fiber angle of 450 can provide reliable estimates for the transverse tensile strength of the material. Using this approach, the biaxial failure properties have been derived in the complete range of shear-transverse tension stress space.
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