Carbon-carbon composites by John D. Buckley, Dan D. Edie PDF

By John D. Buckley, Dan D. Edie

The main components of carbon-carbon fabrics and composites are defined during this finished quantity. It offers info and know-how at the fabrics and buildings constructed for the construction of carbon-carbon fabrics and composites. The textual content consists of papers by way of thirteen famous authors of their parts of workmanship with regards to the strategies and creation of those fabric platforms and buildings. the subject material within the publication is prepared to steer the reader via fabrics processing, fabrication, structural research, and purposes of usual carbon-carbon items. the knowledge supplied comprises: fiber know-how, matrix fabric, layout of composite buildings, production concepts, engineering mechanics, protecting coatings, and structural purposes utilizing carbon-carbon fabrics and composites.

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Extra info for Carbon-carbon composites

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42 A c-direction Figure I . Structure of graphite and approximate orientation in carbon fibers (ref. 6). Today commercial pitch-based carbon fiber is available with a tensile modulus that is 85 percent of the theoretical maximum for the perfect graphite crystal. By comparison, the tensile strength of this fiber is only 5 percent of that theoretically possible. Although increasing the layer plane alignment directly improves the tensile modulus of carbon fibers, flaws limit the tensile strength of these brittle fibers.

10. Singer, Leonard Sidney: High Modulus, High Strength Carbon Fibers Produced From Mesophase Pitch. S. Patent 4,005,183, Jan. 1977. 11. Singer, L. ; and Lewis, I. : ESR Study of the Kinetics of Carbonization. Carbon, vol. 16, no. 6, 1978, pp. 417423. 12. : Forming Optically Anisotropic Pitches. S. Patent 4,208,267, June 1980. 13. : Influence of Additives on Pyrolysis of Mesophase Pitch. Carbon ‘86Proceedings of the International Conference on Carbon, Deutschen Keramishchen Gesellschaft, Bad Honnef (Baden-Baden, Federal Republic of Germany), 1986, p.

Effect of Microstructure on Tensile Properties of Carbon Fibers Assuming that the brittle fracture mechanism proposed by Reynolds and Sharp (see Johnson, ref. 13) applies, the results of microstructural studies might explain the differences in strength and modulus of pitch-based and PAN-based carbon fibers. Given the strength and modulus of any carbon fiber, the Griffith relationship (ref. 18) can determine the critical crack size. o2 - 'Ya_ 2E TC _ ~ (1) where o is the ultimate tensile strength, E is the modulus, ya is the apparent surface energy, and C is the critical crack length.

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