Fatigue crack tip opening behavior in particulate reinforced Al-alloy composites

Gang Liu; J. K. Shang

doi:10.1016/1359-6454(95)00149-2

Fatigue crack tip opening behavior in particulate reinforced Al-alloy composites

Gang Liu, J. K. Shang

Research output: Contribution to journal › Article › peer-review

Abstract

Behavior of fatigue crack growth was examined in an Al₂O₃ paniculate reinforced Al-Cu matrix composite and its matrix alloy, heat-treated to peak-aged and overaged conditions. The fatigue crack growth resistance of the composite was much better, especially at low growth rates, and depended on aging condition. Measurements of crack opening profiles have shown that crack tip in the composite remained closed at fairly high stress intensities and was opened to a much smaller displacement compared to the crack tip opening in the matrix alloy at the same stress intensity. Correlation of the fatigue crack growth rate with crack tip opening displacement (CTOD) revealed that both the composite and the matrix alloy obey the same fundamental relationship that the fatigue crack growth rate scales with the square of the CTOD.

Original language	English (US)
Pages (from-to)	79-91
Number of pages	13
Journal	Acta Materialia
Volume	44
Issue number	1
DOIs	https://doi.org/10.1016/1359-6454(95)00149-2
State	Published - Jan 1996
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/1359-6454(95)00149-2

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title = "Fatigue crack tip opening behavior in particulate reinforced Al-alloy composites",

abstract = "Behavior of fatigue crack growth was examined in an Al2O3 paniculate reinforced Al-Cu matrix composite and its matrix alloy, heat-treated to peak-aged and overaged conditions. The fatigue crack growth resistance of the composite was much better, especially at low growth rates, and depended on aging condition. Measurements of crack opening profiles have shown that crack tip in the composite remained closed at fairly high stress intensities and was opened to a much smaller displacement compared to the crack tip opening in the matrix alloy at the same stress intensity. Correlation of the fatigue crack growth rate with crack tip opening displacement (CTOD) revealed that both the composite and the matrix alloy obey the same fundamental relationship that the fatigue crack growth rate scales with the square of the CTOD.",

author = "Gang Liu and Shang, {J. K.}",

note = "Funding Information: Acknowledgements-Support for this program was provided by the U.S. National Science Foundation under grant No. MSS-9111141. Special thanks are due to Drs P. K. Kurath and D. Zhu for experimental assistance.",

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AU - Liu, Gang

AU - Shang, J. K.

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N2 - Behavior of fatigue crack growth was examined in an Al2O3 paniculate reinforced Al-Cu matrix composite and its matrix alloy, heat-treated to peak-aged and overaged conditions. The fatigue crack growth resistance of the composite was much better, especially at low growth rates, and depended on aging condition. Measurements of crack opening profiles have shown that crack tip in the composite remained closed at fairly high stress intensities and was opened to a much smaller displacement compared to the crack tip opening in the matrix alloy at the same stress intensity. Correlation of the fatigue crack growth rate with crack tip opening displacement (CTOD) revealed that both the composite and the matrix alloy obey the same fundamental relationship that the fatigue crack growth rate scales with the square of the CTOD.

AB - Behavior of fatigue crack growth was examined in an Al2O3 paniculate reinforced Al-Cu matrix composite and its matrix alloy, heat-treated to peak-aged and overaged conditions. The fatigue crack growth resistance of the composite was much better, especially at low growth rates, and depended on aging condition. Measurements of crack opening profiles have shown that crack tip in the composite remained closed at fairly high stress intensities and was opened to a much smaller displacement compared to the crack tip opening in the matrix alloy at the same stress intensity. Correlation of the fatigue crack growth rate with crack tip opening displacement (CTOD) revealed that both the composite and the matrix alloy obey the same fundamental relationship that the fatigue crack growth rate scales with the square of the CTOD.

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Fatigue crack tip opening behavior in particulate reinforced Al-alloy composites

Abstract

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