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The fatigue characteristics of S-glass/epoxy (Scoth-ply SP-250-SF1) and graphite/epoxy (Rigidite 5209-T300) laminates were studied for tension and shear loading. Emphasis was placed on fiber orientations where the matrix contribution to fatigue strength is significant. A general regression curve was used for data analysis, and a two-parameter Weibull model was used for reliability studies. An existing plane-stress macroscopic failure theory for static strength was extended to predict fatigue strength. It was found that the fatigue failure theory provides a conservative approach to first-ply failure which should be useful for preliminary design of composite structures.
composite materials, fatigue (materials), shear tests, tension tests, fiberglass-reinforced plastics, graphite composites, epoxy laminates, regression analysis, reliability
Research project engineer, Bell Helicopter TextronSouthwest Research Institute, Fort WorthSan Antonio, TexTex
Research analysis engineer, Bell Helicopter Textron, Fort Worth, Tex