Thermomechanical stability of graphite/epoxy composites.
Results are reported on an investigation to evaluate the usefulness of selected graphite/epoxy composite structures for applications requiring precision tolerancing and dimensional stability. Thornel 75S/ELRB 4617 and Modmor 1/ELRB 4617 laminate composites in a six-ply design were tested, as well as a honeycomb design having two Thornel/ELRB faceplates bonded to an aluminum honeycomb core. Measurements were made of thermal expansion coefficient and its directional variations, microyielding and microcreep behavior, thermal and temporal stabilities. Data, discussion of results, and recommendations for applicable areas are given for the specific material and design types tested.
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