Effect of fiber architecture on mechanical behavior of SiC(f)/SiC composites

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We evaluated mechanical properties (first matrix cracking stress, strength, and work-of-fracture) of Nicalon-fiber-reinforced silicon carbide matrix composites with three different fiber lay-up sequences (0{degrees}/20{degrees}/60{degrees}, 0{degrees}/40{degrees}/60{degrees}, and 0{degrees}/45{degrees}) at various temperatures from room to 1300{degrees}C. Up to 1200{degrees}C, ultimate strength and work-of-fracture for the 0{degrees}/40{degrees}/60{degrees} and 0{degrees}/45{degrees} composites increased, but then declined at 1300{degrees}C. The decreases were correlated to in-situ Nicalon fiber strength and fiber/matrix interface degradation. However, for the 0{degrees}/20{degrees}/60{degrees} composites, ultimate strength and work-of-fracture reached their a minima at 1200{degrees}C. These measured ultimate strengths at room and 1300{degrees}C were correlated to the predictions made with an analytical model and ... continued below

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13 p.

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Singh, D.; Singh, J.P. & Sutaria, M. January 1, 1997.

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We evaluated mechanical properties (first matrix cracking stress, strength, and work-of-fracture) of Nicalon-fiber-reinforced silicon carbide matrix composites with three different fiber lay-up sequences (0{degrees}/20{degrees}/60{degrees}, 0{degrees}/40{degrees}/60{degrees}, and 0{degrees}/45{degrees}) at various temperatures from room to 1300{degrees}C. Up to 1200{degrees}C, ultimate strength and work-of-fracture for the 0{degrees}/40{degrees}/60{degrees} and 0{degrees}/45{degrees} composites increased, but then declined at 1300{degrees}C. The decreases were correlated to in-situ Nicalon fiber strength and fiber/matrix interface degradation. However, for the 0{degrees}/20{degrees}/60{degrees} composites, ultimate strength and work-of-fracture reached their a minima at 1200{degrees}C. These measured ultimate strengths at room and 1300{degrees}C were correlated to the predictions made with an analytical model and to in-situ fiber strength characteristics. The large difference in room-temperature ultimate strengths between the three sets of composites is attributed to the relative contributions of the off-axis fibers to the load-bearing capacity of each composite.

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13 p.

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OSTI as DE97004091

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  • 21. annual conference and expo on composites, advanced cermics, materials and structures, Cocoa Beach, FL (United States), 12-16 Jan 1997

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  • Other: DE97004091
  • Report No.: ANL/ET/CP--90956
  • Report No.: CONF-970111--8
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 459898
  • Archival Resource Key: ark:/67531/metadc681450

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  • January 1, 1997

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  • July 25, 2015, 2:21 a.m.

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  • Dec. 16, 2015, 12:22 p.m.

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Singh, D.; Singh, J.P. & Sutaria, M. Effect of fiber architecture on mechanical behavior of SiC(f)/SiC composites, article, January 1, 1997; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc681450/: accessed May 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.