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Fracture Properties on SiC Based Particulate Composites

Faber, K. T. and Gu, W.-H. and Cai, H. and Winholtz, R. A. and Magley, D. J. (1991) Fracture Properties on SiC Based Particulate Composites. In: Toughening Mechanisms in Quasi-Brittle Materials. NATO ASI series. Series E, Applied sciences. Vol.195. No.195. Kluwer Academic Publishers , Boston, MA, pp. 3-17. ISBN 0792311981.

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In order to evaluate the role of residual stresses in fracture toughening, a SiC-based particulate composite has been studied under uniform stressing conditions and in the near tip stress field of a pre-cracked specimen. First, residual stresses in a SiC-TiB_2 composite before and after stressing have been measured using x-ray diffraction. Tensile residual stresses in the TiB_2 drop by 50% after bending stresses of 250 MPa were applied. Likewise, the compressive residual stresses in the SiC phase decrease accordingly. Second, in the near tip stress field, a process zone of microcracks has been measured using transmission electron microscopy of thin foils taken from various locations from a fracture surface of a fracture mechanics specimen. Microcrack zones greater than 150 μm in height have been measured. Crack bridging sites of TiB_2 particles operate more than a few millimeters behind a propagating crack. Hence, the toughening in this system is comprised of both stress-induced microcracking and crack bridging. The various contributions to the toughening are discussed.

Item Type:Book Section
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Faber, K. T.0000-0001-6585-2536
Additional Information:© 1991 Kluwer Academic Publishers. Materials for this study were graciously provided by the Carborundum Company, Niagara Falls, NY. This work was supported by the National Science Foundation under Grant No. DMR-8896212.
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Series Name:NATO ASI series. Series E, Applied sciences
Issue or Number:195
Record Number:CaltechAUTHORS:20140908-181329775
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49443
Deposited By: George Porter
Deposited On:12 Sep 2014 23:42
Last Modified:10 Nov 2021 18:44

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