Determining worst-case fatigue thresholds for grain-bridging ceramics

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A method for determining worst-case cyclic fatigue thresholds in grain-bridging ceramics by quantifying the role of bridging is demonstrated for a model alumina. Crack-growth properties for both long and short (< 2 mm) cracks emanating from machined notches (root radii, (rho) {approx}; 15 - 150 (mu)m) were investigated. When compared as a function of the applied stress-intensity range (delta K), growth rates (da/dN) were far higher and fatigue thresholds (Delta)KTH were markedly lower with short cracks, with growth being observable at the lowest driving forces for short cracks emanating from razor micronotches ((rho)is approximately equal to 15 (mu)m). For growth ... continued below

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Kruzic, J.J.; Yuan, R.; Canon, R.M. & Ritchie, R.O. October 7, 2002.

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A method for determining worst-case cyclic fatigue thresholds in grain-bridging ceramics by quantifying the role of bridging is demonstrated for a model alumina. Crack-growth properties for both long and short (< 2 mm) cracks emanating from machined notches (root radii, (rho) {approx}; 15 - 150 (mu)m) were investigated. When compared as a function of the applied stress-intensity range (delta K), growth rates (da/dN) were far higher and fatigue thresholds (Delta)KTH were markedly lower with short cracks, with growth being observable at the lowest driving forces for short cracks emanating from razor micronotches ((rho)is approximately equal to 15 (mu)m). For growth rates < 10-8 m/cycle, da/dN vs. (delta)K data for short cracks merged with the steady-state data for long cracks after {approx}2 mm of extension.

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OSTI as DE00805154

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  • 132nd Annual Meeting of the Minerals, Metals and Materials Society (TMS), San Diego, CA (US), 03/02/2003--03/06/2003

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  • Report No.: LBNL--51612
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 805154
  • Archival Resource Key: ark:/67531/metadc740313

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  • October 7, 2002

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  • Oct. 18, 2015, 6:40 p.m.

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  • April 4, 2016, 12:39 p.m.

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Kruzic, J.J.; Yuan, R.; Canon, R.M. & Ritchie, R.O. Determining worst-case fatigue thresholds for grain-bridging ceramics, article, October 7, 2002; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc740313/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.