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Uniaxial flexure and tension tests and biaxial flexure tests were performed on two systems of fiber glass-reinforced polyester (FRP) and also on an FRP-polyurethane foam composite to evaluate their suitability for possible use as expedient paving materials. The principal parameters studied were ultimate strength, elastic modulus, and fatigue behavior.
Results of the uniaxial tests were found to compare favorably with the results of the biaxial tests. A method of stress analysis for the biaxial tests was developed to accommodate a center loaded, clamped, circular plate subjected to large deflections and having radial forces on the boundary.
From the results of the research it was found that factors affecting the volume proportions of resin, glass, and air, and factors affecting the properties of the resin could have an influence on the properties of the FRP, in accordance with the “rule of mixtures” . Both the ultimate-strength test results and the fatigue tests results indicated that Materials Systems A was superior to Materials System B.
composite materials, stresses, strains, deformation, fatigue (materials), flexure test, flexural modulus, anisotropy, mechanical properties, fatigue failure
Assistant professor of agricultural engineering, Cornell University, Ithaca, N.Y.
Associate professor of civil engineering, Texas A&M University, College Station, Tex.
Major, U.S. Air Force Systems Command, Kirtland AFB, N.M.