Type of Document	Master's Thesis
Author	Elmore, Jennifer Susan
URN	etd-10312009-020414
Title	Dynamic mechanical analysis of graphite/epoxy composites with varied interphases
Degree	Master of Science
Department	Engineering Mechanics
Advisory Committee	Advisor Name Title Reifsnider, Kenneth L. Committee Co-Chair Stinchcomb, Wayne W. Committee Co-Chair Hajj, Muhammad R. Committee Member
Keywords	Fibrous composites
Date of Defense	1994-07-15
Availability	restricted
Abstract Dynamic mechanical analysis (DMA) has been used extensively to characterize polymeric materials. This thesis investigates the use of this technique to characterize composite materials. Four material systems, all having the same fiber and the same matrix material, were systematically altered with different interphase regions. Initial run data indicates that the variation in fiber sizings create different interphase regions that are detectable by DMA. However, some post-cured specimens revealed that those differences are reduced with further heat treatment. Fiber sizing variation also affects the material response to thermal and mechanical cycling. Different fiber surface treatments have little effect on the dynamic mechanical response of the materials. It is shown that DMA is a test method that yields repeatable results and is capable of detecting small changes in compsite constituents.
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