R-curve behavior of whisker-reinforced ceramic composites

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Ceramics have attracted great interest for advanced heat engines and industrial applications as a result of their stiffness, light weight, corrosion resistance, and superior performance at high temperatures. However, their utilization in engineering applications is severely limited by their brittleness. One approach toward substantially reducing this brittleness is by incorporating strong whiskers into the ceramic matrix. Studies of whisker-reinforced ceramic composites have shown both rising fracture resistance with crack extension (i.e. R-curve behavior) and a three- to four-fold increase in steady-state toughness. The primary toughening mechanism is bridging of the crack surface by whiskers. This paper discusses the bridging mechanism ... continued below

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3 p.

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Hsueh, Chun-Hway & Becher, P.F. June 1, 1995.

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Ceramics have attracted great interest for advanced heat engines and industrial applications as a result of their stiffness, light weight, corrosion resistance, and superior performance at high temperatures. However, their utilization in engineering applications is severely limited by their brittleness. One approach toward substantially reducing this brittleness is by incorporating strong whiskers into the ceramic matrix. Studies of whisker-reinforced ceramic composites have shown both rising fracture resistance with crack extension (i.e. R-curve behavior) and a three- to four-fold increase in steady-state toughness. The primary toughening mechanism is bridging of the crack surface by whiskers. This paper discusses the bridging mechanism in detail and presents R-curves for SiC whisker-reinforced Al{sub 2}O{sub 3} composites.

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3 p.

Notes

OSTI as DE95012873

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  • 2. international conference on high temperature ceramic matrix composites, Santa Barbara, CA (United States), 21-25 Aug 1995

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  • Other: DE95012873
  • Report No.: CONF-9508127--1
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 74031
  • Archival Resource Key: ark:/67531/metadc707472

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Office of Scientific & Technical Information Technical Reports

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  • June 1, 1995

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  • Sept. 12, 2015, 6:31 a.m.

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  • Jan. 29, 2016, 7:37 p.m.

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Hsueh, Chun-Hway & Becher, P.F. R-curve behavior of whisker-reinforced ceramic composites, article, June 1, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc707472/: accessed April 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.