Title page for ETD etd-10312009-020414

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
  • Fibrous composites
Date of Defense 1994-07-15
Availability restricted

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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