Thermal Degradation of Graphite/Epoxy Composite.
Final rept. 16 Apr 79-30 Sep 80,
HERCULES INC MAGNA UT BACCHUS WORKS
Pagination or Media Count:
The purpose of this effort was to develop visual, NDI, and residual strength correlations as a result of thermal degradation upon thick composite laminates. These investigations were performed upon dry 0.25-inch-thick, coated graphite composite AS-13501-6 laminates subjected to thermal shock on one side. Exposure temperatures were 350 degrees, 400 degrees, 500 degrees, 600 degrees, 800 degrees, 1200 degrees, 1600 degrees, and 1800 degrees F. Temperature gradients were obtained from instrumental panels under no-load conditions. Thermal shocking of panels and specimens while under sustained strain 2500 microns in.in. conditions provided comparisons of load carrying ability. Other specimens were tested for residual strength after thermal exposure. Ultrasonic examinations were performed, as was monitoring of color changes. Permanent matrix damage began to occur during a 600 degrees F exposure. Author
- Laminates and Composite Materials