Analyses of interfacial shear debonding in fiber-reinforced ceramic composites

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An important toughening mechanism in fiber-reinforced ceramic composites is pullout of fibers from the matrix during matrix cracking. This relies on mode II (i.e., shear) debonding at the fiber/matrix interface which can be analyzed using either the strength-based or the energy-based criterion. In the strength-based approach, debonding occurs when the maximum interfacial shear stress induced by the applied load reaches the interfacial shear strength, {tau}{sub s}. In the energy-based approach, a mode II crack propagating along the interface is considered, and debonding occurs when the energy release rate due to crack propagation reaches the interface debond energy, {Gamma}{sub 1}. Based ... continued below

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4 p.

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Hsueh, C.H. & Becher, P.F. February 1, 1998.

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An important toughening mechanism in fiber-reinforced ceramic composites is pullout of fibers from the matrix during matrix cracking. This relies on mode II (i.e., shear) debonding at the fiber/matrix interface which can be analyzed using either the strength-based or the energy-based criterion. In the strength-based approach, debonding occurs when the maximum interfacial shear stress induced by the applied load reaches the interfacial shear strength, {tau}{sub s}. In the energy-based approach, a mode II crack propagating along the interface is considered, and debonding occurs when the energy release rate due to crack propagation reaches the interface debond energy, {Gamma}{sub 1}. Based on the above two criteria, the applied stress on the fiber to initiate debonding (i.e., the initial debond stress), {sigma}{sub d}, can be derived. The first issue considered in the present study is the relation between {tau}{sub s} and {Gamma}{sub 1}. Also, for a monolithic ceramic, the tensile strength can be related to its defect size based on the Griffith theory. A question is hence raised as to whether the initial debond stress for fiber pullout in a fiber-reinforced ceramic composite can be related to any defect at the interface.

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4 p.

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OSTI as DE98004961

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  • 5. international conference on composites engineering, Las Vegas, NV (United States), 5-11 Jul 1998

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  • Other: DE98004961
  • Report No.: ORNL/CP--96904
  • Report No.: CONF-980717--
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 650365
  • Archival Resource Key: ark:/67531/metadc702604

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  • February 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • Jan. 15, 2016, 12:42 p.m.

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Hsueh, C.H. & Becher, P.F. Analyses of interfacial shear debonding in fiber-reinforced ceramic composites, article, February 1, 1998; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc702604/: accessed May 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.