Department: Structural Engineering
Faculty Advisor(s):
Primary Student
Name: Stephanie L. Svetlik
Email: ssvetlik @ ucsd.edu
Phone: 858-822-3788
Grad Year: 2008
Abstract
Moisture sorption of polymer composites immersed in deionized water at different temperatures has been investigated at length as a means for performing accelerated degradation. The relation of this sorption behavior to actual behavior in various hygrothermal environments still remains to be seen. This test program will model the behavior of a pultruded E-glass/vinyl ester composite in thirteen environments involving three temperatures and three relative humidities. Low humidity exposures result in a post-cure effect at high temperatures, enabling the isolation of moisture sorption effects at higher humidities from purely thermal effects. Additionally, the sorption behavior of the glass composite due to immersion in deionized water at four temperatures (20, 40, 60, 80 degrees Celsius) is investigated in order to link behavior in non-saturated environments to immersion environments. A main goal of this work is to create a model which will relate the change in tensile properties, short beam shear strength, and glass transition temperature with moisture sorption. Substitution of moisture content for time in standard time dependent predictive models will remove the necessity to investigate the temporal nature of the sorption trend and degradation of mechanistic properties. Investigation of common known mechanisms of degradation such as pitting of glass fiber and interfacial facial degradation will be extended by consider moisture gain or loss in conjunction with microscopy.
Related Links:
- http://www.jacobsschool.ucsd.edu/
Related Files:
- re08.gif
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