Stress Effects on Moisture Transport in an Epoxy Resin and Its Composite.
TEXAS A AND M UNIV COLLEGE STATION MECHANICS AND MATERIALS RESEARCH CENTER
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This paper presents the results of a experimental investigation of stress effects on the sorption of water vapor in an epoxy resin and its composite. Such effects were noted by several researchers in both polymers and composites, although these earlier investigations did not present a comprehensive study of the phenomenon. This paper summarizes results which were obtained recently. It is shown that in both epoxy and graphiteepoxy composites, external stresses affect the diffusion process. In the case of the resin, stresses appear to raise the affect the diffusion process. In the case of the resin, stresses appear to raise the moisture saturation levels while in composites stresses appear to affect the entire sorption process, accentuating the a-symmetries between absorption and desorption behavior. In both materials the moisture transport process departs both quantitatively and qualitatively from the predictions of classical, Fickean diffusion.
- Laminates and Composite Materials