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Failure behavior of carbon/carbon composites prepared by chemical vapor deposition

✍ Scribed by K.Y. Sohn; Oh Seh-Min; Lee Jai-Young

Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
878 KB
Volume
26
Category
Article
ISSN
0008-6223

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✦ Synopsis

Abstrad-Tensile

tests have been performed on carbon/carbon composites made from carbon cloths and a pyrolytic carbon matrix and their failure surfaces were examined by scanning electron microscopy. The load-extension curves are characterized by three distinct regions: the applied load needed to maintain a constant extention rate increases initially (region I), which is maintained at an almost constant level (region II), then the load increases again until the abrupt failure of the composite occurs (region III). Cracks are initiated in region II and the composite becomes deformed plastically before failure. Circumferential microcracks formed due to the thermal anisotropic contraction of the pyrolytic carbon matrix deviated the path of the advancing cracks and therefore increased the toughness of the composites. Fractography showed a terraced fracture surface in the matrix of the composites in which distinct circumferential microcracks are formed in front of the advancing cracks.

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