Interfacial shear strength of C/C composites |
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Authors: | Yuko Furukawa Yasuo Kogo |
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Affiliation: | a Tokyo University of Science, Department of Material Science and Technology, Faculty of Industrial Science and Technology, 2641 Yamazaki, Noda, Chiba 278-8510, Japan b Research Division of Space Propulsion, Institute of Space and Astronautical Science, 3-1-1, Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan |
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Abstract: | Fiber-bundle push-out, single-fiber push-in, and single-fiber push-out tests were conducted in order to examine the applicability of these methods for determining the interfacial shear strength of carbon-carbon composites. The fiber-bundle push-out test resulted mostly in fractures along the fiber/matrix interface but created a small amount of fractures in the matrix. Hence, the evaluated strength was regarded as an approximate value. In order to precisely evaluate the interfacial strength, push-in and push-out tests for a single fiber were performed using a micro-Vickers indentation tester. In these tests, the load has to be placed within a target fiber, and the indentation should not extend to the matrix. This condition restricted the load that could be applied to a carbon fiber. Within this limit, a single carbon fiber could not be pushed-in. For the sake of load reduction, single-fiber push-out tests were conducted using thin specimens. The thickness appropriate for a single-fiber push-out specimen was estimated based on the interfacial shear strength obtained by the bundle push-out tests. Below this thickness, single-fiber push-out tests could be successfully performed. |
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Keywords: | A Carbon fibers Carbon/carbon composites C Scanning electron microscopy (SEM) D Interfacial properties |
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