SYMPOSIA PAPER Published: 01 January 1975

Optimization of the Thermal Shock Resistance of Carbon-Carbon Composites


A three-dimensional rule of mixtures model was developed to calculate the room-temperature thermal and mechanical properties of carbon-carbon composites whose constituents have anisotropic properties. The model was used, along with the properties of different carbon fibers and pyrocarbon matrices, to determine the fiber-matrix combination, constituent volume fractions, and constituent orientations that maximize expected composite thermal shock resistance of heat shields. The results indicate that a composite having a low volume fraction of high-modulus carbon fibers, arranged in a 3D array, and coated with anisotropic, heat-treated pyrocarbon matrix, will have the maximum thermal shock resistance. Confidence in the model was established by good agreement between model predictions and experimental data on actual carbon-carbon composites.

Author Information

Guess, TR
Sandia Laboratories, Albuquerque, N. Mex.
Butler, BL
Sandia Laboratories, Albuquerque, N. Mex.
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Developed by Committee: D30
Pages: 229–246
DOI: 10.1520/STP32311S
ISBN-EB: 978-0-8031-4660-0
ISBN-13: 978-0-8031-0309-2