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TECHNICAL PAPERS

Characterization of Fatigue Damage Modes in Nicalon/Calcium Aluminosilicate Composites

[+] Author and Article Information
Jeongguk Kim

Railroad Safety Research and Testing Center, Korea Railroad Research Institute, Kyunggi, South Korea 437-757

Peter K. Liaw

Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996-2200

J. Eng. Mater. Technol 127(1), 8-15 (Feb 22, 2005) (8 pages) doi:10.1115/1.1836766 History: Received January 01, 2003; Revised September 14, 2004; Online February 22, 2005
Copyright © 2005 by ASME
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References

Figures

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Cross-sectional views of (a) [0/90]4S crossply Nicalon™/CAS composite and (b) [0] unidirectional Nicalon™/CAS composite, respectively. Note that the unidirectional composite does not show a clear distinction between plies due to hot-pressing process.
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Tensile behavior of crossply and unidirectional Nicalon™/CAS composites
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High-cycle fatigue behavior of Nicalon™/CAS composites
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Temperature evolution during fatigue testing for both crossply and unidirectional Nicalon™/CAS composites
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Fracture surface of a fatigued crossply Nicalon™/CAS composite sample
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Fracture surface of the fatigued sample with higher magnification from Fig. 5. The crack initiated inside (center) the sample, propagated to the outside of the sample, and final failure occurred with extensive fiber pullout.
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Failure mechanisms of a crossply Nicalon™/CAS composite during fatigue: (a) crack propagation in the 90° fiber bundle at the fracture surface, (b) the crack propagation into the 0° fiber bundle, (c) more matrix cracking in the 0° ply, (d) debonding at the 0° fiber bundle, and (e) final fiber pullout in the 0° fiber bundle
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Fatigue fracture surface of a crossply Nicalon™/CAS composite
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The detailed SEM micrographs of the fracture surfaces in a crossply Nicalon™/CAS composite from Fig. 8: (a) seventh ply (0°), (b) ninth ply (0°), (c) eleventh ply (0°), (d) thirteenth ply (0°), and (e) fifteenth ply (0°)
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A SEM micrograph showing extensive fiber pullout from first ply in Fig. 8
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Limited or almost no fiber pullout from the center of the sample (seventh ply) in a crossply Nicalon™/CAS composite
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SEM micrograph showing toughening mechanisms in a cross-ply Nicalon™/CAS composite; interfacial debonding of the fiber and matrix, crack deflection, and fiber pullout
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Fiber debonding from the matrix area and matrix debris on the fatigue fracture surface of a unidirectional Nicalon™/CAS composite
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Fiber pullout and final failure of a unidirectional Nicalon™/CAS composite
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Fatigue fracture surface with extensive fiber pullout in a unidirectional Nicalon™/CAS composite

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