Applicability of Fracture Toughness Concept to Fracture Behavior of Carbon/Carbon Composites.
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Abstract
Carbon/Carbon(C/C) composites have attractive mechanical properties such as superior specific strength and high elastic modulus at high temperature exceeding 2000°C in an inert atmosphere. However, mainly due to lack of knowledge of design criteria, C/C composites have not been used in primary heat resistant structures. For example, almost no unified explanation has been given about the fracture behavior of C/C composites. The objective of this paper is to examine the adequacy of the linear elastic fracture mechanics(LEFM) as the fracture criterion of notched C/C composites. Thus the LEFM was tried to be applied to fracture behavior in tensile tests of double-edge-notched and compact tension specimens and in four-point bending tests of single-edge-notched specimens. It was found that the results of three kinds of fracture tests can be consistently and rationally explained in terms of the LEFM concept with the aid of R-curve behavior if the pre-crack length is long enough to be able to neglect the notch tip radius. From fractographic observation it was found that R curve behavior of C/C composites was mainly attributed to the fiber-bridging effect near the notch tip.
Journal
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- JSME International Journal Series A
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JSME International Journal Series A 42 (2), 265-271, 1999
The Japan Society of Mechanical Engineers
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Details 詳細情報について
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- CRID
- 1390001206493724416
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- NII Article ID
- 130003741834
- 110002965365
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- NII Book ID
- AA11179396
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- ISSN
- 13475363
- 13447912
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- NDL BIB ID
- 4986985
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed