Degradation of Graphite-Epoxy Due to Electron Radiation

[+] Author and Article Information
C. T. Herakovich, D. J. Fox

Virginia Polytechnic Institute and State University, Blacksburg, VA 24060

G. F. Sykes

NASA Langley Research Center

J. Eng. Mater. Technol 110(2), 146-152 (Apr 01, 1988) (7 pages) doi:10.1115/1.3226023 History: Received November 11, 1987; Online September 15, 2009


Experimental results are presented showing that electron irradiation has a variable effect on the properties of graphite-epoxy depending upon the test temperature and the property of interest. In general, compression properties are improved at cold temperature and degraded at elevated temperature. With the exception of some moduli, tensile and shear properties are degraded at both cold and elevated temperatures. Electron irradiation lowers the glass transition temperature of graphite/epoxy significantly. Property degradation of irradiated materials at the elevated temperature is associated with the reduction in Tg . It is shown that a [0] compression strength test is the most sensitive test for exhibiting the effects of electron irradiation. Results from tests on neat resin also show that the bulk matrix is degraded after irradiation and that the correlation between resin and composite response is good.

Copyright © 1988 by ASME
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