A new test methodology for measuring transverse/interlaminar shear strength and Mohr-Coulomb friction factor of thick-section composites under quasi-static compression loading is developed. Experimental results are used to evaluate various quasi-static failure criteria. This is accomplished by testing out-of-plane off-axis composite materials to determine the interlaminar shear strength, S{sub}13, and friction function, f. Two different types of plane weave S2-glass/SC79 fabric composites were used in this investigation. Quasi-static v-notch shear test results for interlaminar shear strength are in excellent agreement with the results from the off-axis compression test method.
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