A test program was developed to compare the viscoelastic behavior of an untoughened epoxy (R922) with a toughened epoxy (R6376). Creep/recovery tests were performed on neat resin as well as [ ± 40° ]2s composites using T500 or IM7 graphite fibers. The composite specimens were subjected to at least five cycles of load/unload at each stress level. The goal was to study the viscoelastic response of a flexibilized and unflexibilized epoxy and to try and observe any microstructural changes that might occu…
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