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Torsional fatigue data are presented for boron/epoxy and graphite/epoxy composites. The failure criterion for the tests is shear modulus reduction. The modulus reduction is shown to be caused by cracks that occur in resin-rich portions of the composites. Resistance to torsional fatigue is found to increase as fiber distribution becomes more uniform and as interfiber distance is decreased.
composite materials, graphite composites, boron composites, fiber composites, filaments, graphite, boron, epoxy resins, mechanical properties, fatigue, shear strength, flexural properties, crack propagation failure
Research scientist, United Aircraft Research Laboratories, East Hartford, Conn.