The Effect of Moisture on Carbon Fiber REinforced Epoxy Composites. II. Mechanical Property Changes
- 3 February 1977
- report
- Published by Defense Technical Information Center (DTIC)
Abstract
The changes in the matrix dominated flexural and short beam shear strengths of six carbon fiber composites were determined as a function of temperature and absorbed moisture. Moisture absorption led to a strength reduction between 10 and 40 percent, depending on temperature, but this reduction in strength leveled out after equilibrium was reached with the surrounding environment. It was concluded that this loss in strength is due to a reduction in resin modulus over a wide temperature range caused by the plasticizing effect of moisture on the matrix. This loss in resin modulus was reversible, and the original dry modulus-temperature-curve was regained after the absorbed moisture was removed; simultaneously the original composite dry strength was recovered. (Author)Keywords
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