Thermal Conductance of Delamination Cracks in a Fiber-Reinforced Ceramic Composite |
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| Authors: | Kathleen R. McDonald John R. Dryden Arun Majumdar Frank W. Zok |
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| Affiliation: | Materials Department, University of California, Santa Barbara, California 93106, Berkeley, California 94720;Department of Mechanical and Materials Engineering, Faculty of Engineering Science, University of Western Ontario, London, Ontario N6A 5B9, Canada, and Berkeley, California 94720;Department of Mechanical Engineering, University of California, Berkeley, California 94720 |
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| Abstract: | The thermal conductance of delamination cracks in a unidirectionally reinforced ceramic composite is investigated. A phase-sensitive photothermal technique is used to measure the crack conductance in situ under load. Special emphasis is given to the effects of the local crack opening displacement (δ). A crack conductance model that considers the contributions from both the air and the fibers within the crack is developed and compared with the measurements. Despite considerable scatter in the experimental data, the model adequately predicts the increased conductance that is associated with fiber bridging, as well as the overall trend that is observed with δ. |
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| Keywords: | composites cracks/cracking thermal properties |
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