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This paper reports on 54 biaxial-loading tests on fiber glass-epoxy laminates of three lamination schemes: parallel ply, cross ply, and quasi-isotropic. The tests were conducted on a specially designed fixture using a cable-pulley system in conjunction with a universal testing machine. The loadings were biaxial tension with 1:1 and 1:2 principal-load ratios. The contours of the reduced-thickness test sections of the flat specimens were designed to achieve a uniform-stress field.
fiber composites, reinforced plastics, mechanical properties, evaluation, tests
Bert, C. W.
Project director and professor, University of Oklahoma, Norman, Okla.
Mayberry, B. L.
Research engineer, now 2nd Lieutenant, U.S. Air Force, Tex.
Ray, J. D.
Co-project director; now assistant professor, Memphis State University, Memphis, Tenn.