| タイトル | Fractographic Analysis of HfB2-SiC and ZrB2-SiC Composites |
| 著者（英） | Arnold, Jim; Mecholsky, J.J., Jr.; Stackpoole, M. M.; Loehman, R. E.; Ellerby, D. T.; Johnson, S. M. |
| 著者所属（英） | NASA Ames Research Center |
| 発行日 | 2001-01-01 |
| 言語 | eng |
| 内容記述 | Hafnium 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. |
| NASA分類 | Composite Materials |
| 権利 | Copyright |
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