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Fractographic Analysis of HfB2-SiC and ZrB2-SiC CompositesHafnium diboride-silicon carbide and zirconium diboride-silicon carbide composites are potential materials for high temperature leading edge applications on reusable launch vehicles. In order to establish material constants necessary for evaluation of in-situ fracture, bars fractured in four point flexure were examined using fractographic principles. The fracture toughness was determined from measurements of the critical crack sizes and the strength values, and the crack branching constants were established to use in forensic fractography of materials for future flight applications. The fracture toughnesses range from about 13 MPam (sup 1/2) at room temperature to about 6 MPam (sup 1/2) at 1400 C for ZrB2-SiC composites and from about 11 MPam (sup 1/2) at room temperature to about 4 MPam (sup 1/2) at 1400 C for HfB2-SiC composites.
Document ID
20020048273
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Mecholsky, J.J., Jr.
(Sandia National Labs. Albuquerque, NM United States)
Ellerby, D. T.
(NASA Ames Research Center Moffett Field, CA United States)
Johnson, S. M.
(NASA Ames Research Center Moffett Field, CA United States)
Stackpoole, M. M.
(Eloret Corp. Moffett Field, CA United States)
Loehman, R. E.
(Sandia National Labs. Albuquerque, NM United States)
Arnold, Jim
Date Acquired
August 20, 2013
Publication Date
January 1, 2001
Subject Category
Composite Materials
Meeting Information
Meeting: 26th Annual International Conference on Advanced Ceramics and Composites
Country: Unknown
Start Date: January 13, 2002
End Date: January 18, 2002
Distribution Limits
Public
Copyright
Other

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