The Effects of Radial Yarns, Three-Dimensionally Reinforced Carbon-Carbon Composite.
Abstract
Some cylindrically wound, carbon-carbon billets have had gross fracture of the circumferential bundles during thermal processing. One function of the radial bundles is to reduce the stress that causes such fractures. An analysis is presented to show the potential reduction of the stress in the circumferential bundles during processing if the radial bundles remain intact. A simple analysis shows that the stress in the radial bundles is even higher than that in the circumferentials; therefore, they are likely to fail by either fracture or debonding. The radial bundles terminate at the outer and inner radii; an analysis is made of the debonding from the local shear near the ends of the radial bundles. Partial benefit of the radials might be obtained if creep reduced the stress in them. An experimental study on the creep of pitch-impregnated, uni-bundle specimens was conducted and results are presented. Based on creep of the radials, a procedure is presented to find an optimum time-temperature path to avoid failure of the radial bundles and characteristic optimum paths are presented.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1984
- Accession Number
- ADA144751
Entities
People
- D. Quan
- G. Sines
- Samuel B. Batdorf
Organizations
- University of California, Los Angeles