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Creep tests were run on glass fiber and Thornel fiber/epoxy matrix composites. Composite creep rates depend on specimen geometry, which can be explained by considering the average deviatoric and equivalent stress states that exist in the matrix. Tests indicate that the matrix is in the bulk plastic region considerably before failure. The stress dependence of the creep rate is used to determine the yield stress of the pure epoxy and the stress level at which the matrix of a composite becomes fully plastic.
creep tests, creep rate, stresses, failure, yield stress, strain rate, plastic properties, deformation, modulus of elasticity, composite materials, fiberglass reinforced plastics, epoxy resins, laminates, stress strain diagrams
Bell Telephone Laboratories, Columbus, Ohio
Associate professor of engineering, Case Western Reserve University, Cleveland, Ohio