The R-curve response of ceramics with microscopic reinforcements: Reinforcement and additive effects

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Using direct observations with the scanning electron and optical microscopes, simultaneous measurements of fracture resistance versus crack length (R-curve behavior) and crack interactions with microstructural features at the crack tip and in its wake were made. Selecting whisker-reinforced aluminas and self-reinforced silicon nitrides, one can examine the effects of systematic modifications of microstructure and composition on the R-curve response and the mechanisms giving rise to it. Specifically, increases in whisker content and size can increase the R-Curve response, even for short crack lengths. In the self-reinforced silicon nitrides, changes in alumina: yttria additive ratios also modify the R-curve. Modeling of ... continued below

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13 p.

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Becher, P.F.; Sun, E.Y.; Plucknett, K,P. & Hsueh, C.H. May 1, 1996.

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Using direct observations with the scanning electron and optical microscopes, simultaneous measurements of fracture resistance versus crack length (R-curve behavior) and crack interactions with microstructural features at the crack tip and in its wake were made. Selecting whisker-reinforced aluminas and self-reinforced silicon nitrides, one can examine the effects of systematic modifications of microstructure and composition on the R-curve response and the mechanisms giving rise to it. Specifically, increases in whisker content and size can increase the R-Curve response, even for short crack lengths. In the self-reinforced silicon nitrides, changes in alumina: yttria additive ratios also modify the R-curve. Modeling of the R-curve response allows one to verify toughening mechanisms and, with experimental studies, to optimize the R-curve behavior in ceramics containing microscopic reinforcements, e.g., whiskers and elongated grain structures.

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13 p.

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OSTI as DE96010461

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  • 1996 NATO engineering ceramics conference, Bratislava (Slovakia), 12-15 May 1996

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  • Other: DE96010461
  • Report No.: CONF-9605168--1
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 236283
  • Archival Resource Key: ark:/67531/metadc670149

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  • May 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • Jan. 29, 2016, 7:37 p.m.

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Becher, P.F.; Sun, E.Y.; Plucknett, K,P. & Hsueh, C.H. The R-curve response of ceramics with microscopic reinforcements: Reinforcement and additive effects, article, May 1, 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc670149/: accessed May 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.