The Effect of Fiber Arrangement on the Mechanical Properties of a Unidirectional CFCC

Jessen, Todd L.; Powers, James; Bender, Barry A.

doi:10.1002/9780470314234.ch37

Cited by 2 publications

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“…In 1989, Granju and Ringot, 7 while studying mortar and concrete formulations, identified a tendency for reinforcing fibers to settle into nonhomogeneous arrangements with corresponding nonuniform properties. In 1993, Jessen et al 8 used various mixing arrangements of both BN-coated and uncoated Nicalon™ fibers (Nippon Carbon, Tokyo, Japan) to create localized regions of weak or strong interfacial bonding, resulting in widely varying mechanical behavior. In a subsequent study, 9 they used a tessellation technique to correlate regions of higher and lower fiber density with composite properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Microstructure on the Mechanical Behavior of Continuous‐Fiber‐Reinforced Ceramic‐Matrix Composites

Jessen

Greenhut

Lewis

et al. 1999

Journal of the American Ceramic Society

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The mechanical behavior of a unidirectional continuousfiber ceramic-matrix composite (CFCMC) was correlated with matrix-rich channels in the microstructure. A large population of CFCMCs was prepared via alkoxide infiltration, which incorporated either uncoated Nicalon™ fibers (64 samples) or BN-coated fibers (118 samples). No structure/property correlation was observed for the uncoated composites, because of the uniformity of the microstructure. For the BN-coated composites, both the flexure strength and work of fracture (WOF) were correlated with oriented matrix-rich channels. The channels were <90 µm wide and were distributed throughout the cross section. The BN-coated CFCMCs exhibited laminate-like behavior: the strength was statistically higher when the channels were aligned parallel with the applied load and the WOF was statistically higher when the channels were perpendicular to the load. Grouping the specimens on the basis of channel orientation, relative to applied load, reduced the variance in strength and WOF. This categorization also resulted in consistent, predictable failure behavior. This observation implies that prior CFCMC data that do not consider microstructure orientation may show wider scatter in mechanical behavior than is warranted.

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Section: Introductionmentioning

confidence: 99%