SEDL / STP / STP497-EB / STP27765S

Creep Behavior of Elastic Fiber/Epoxy Matrix Composite Materials

Koeneman, JB
Bell Telephone Laboratories, Columbus, Ohio

Kicher, TP
Associate professor of engineering, Case Western Reserve University, Cleveland, Ohio

Pages: 13    Published: Jan 1972

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Abstract

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.