Development of Improved Graphite Fiber Composites.
Final rept. 14 Apr 72-11 May 73,
PHILCO-FORD CORP NEWPORT BEACH CALIF AERONUTRONIC DIV
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This program explored potential avenues for maximizing the impact strength of advanced graphite composites without significantly affecting other directional strength properties or producing significant weight penalties. The approach involved the incorporation of third phase supplementary thin ply reinforcement added to the basic graphite composite. Materials which were evaluated were PRD-49, Thornel 400, and S-2 glass yarns. A potential second area of impact improvement which was investigated involved the use of boron and boron compounds as a graphite fiber surface treatment to interfacial resin-fiber BONDING PROPERTIES IN THE COMPOSITES. The most promising third phase additive was S-2 glass yarn which increased the impact strength of a graphite composite 550 for a 25 fiber volume composite and 260 for a 10 fiber volume composite. Instrumented Charpy impact strengths were determined for selected composites. Ultimate loads and load versus time data demonstrated the large energy absorbtion characteristics of the hybrid composites and identified and delineated significant and subtle differences in fracture energy levels. Author-PL
- Laminates and Composite Materials