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A discussion of several failure criteria from their initial application to homogeneous, orthotropic materials to their extension to “quasi-homogeneous,” anisotropic materials is presented. Also discussed are the assumptions, general limitations, and the physical and analytical significance of the respective “material constants.” The basic criteria include the Lame'-Navier maximum stress theory, Henky-von Mises distortional energy theory, Tresca maximum shear stress theory, and the St. Venant maximum strain stream theory.
composite materials, mechanical properties, anisotropic, unidirectional, fiber composites, fiberglass, reinforced plastics, boron, epoxy laminates, evaluation, tests
Kaminski, B. E.
Structures engineergraduate student, General Dynamics Corp.Georgia Institute of Technology, Fort WorthAtlanta, Tex.Ga.
Lantz, R. B.
Senior engineer, AVCO Aerostructures Division, Nashville, Tenn.