Development of Improved Graphite Fiber Composites.
Abstract
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 11, 1973
- Accession Number
- AD0763376
Entities
People
- Jim P. Pope
- John L. Perry
- Michael L. Damoth