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Predicting the Effects of Overloads on Fatigue Crack Growth in an Al-SiC MMC Using a Computational Model

[+] Author and Article Information
M. S. Bruzzi, P. E. McHugh

Micromechanics Research Unit, Department of Mechanical & Biomedical Engineering, National University of Ireland, Galway, Ireland

J. Eng. Mater. Technol 126(2), 172-178 (Mar 18, 2004) (7 pages) doi:10.1115/1.1647126 History: Received March 26, 2003; Revised November 11, 2003; Online March 18, 2004
Copyright © 2004 by ASME
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References

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Figures

Grahic Jump Location
Residual “hump” of stretched material in the wake of the crack tip, caused by the overload
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Estimation of R-curve for the Al 2124 MMC using method of Heitmann et al. 22 and the R=0.1 experimental data of Tabernig and Pippan 25 for calibration
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Effect of stress amplitude on σopen evolution with Δa
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Profile of increase and decrease in σopen with crack extension through plastic zone due to σol
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Typical evolution of σopen after a single peak overload occurring within a constant amplitude loading block
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Predicted crack growth retardation following a peak overload due to an increase in plasticity-induced crack closure
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Predicted retardation effect of a single overload on the short crack growth behavior of a fatigue crack
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Predicted short crack growth rate curves for various overload ratios, rol, occurring every 1000 cycles. Also shown are experimental long crack curves of Tabernig and Pippan 25 for constant amplitude loading at R=0.1, and with periodic overloads of rol=1.8 every 1000 cycles.
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The effect of overload frequency on the fatigue life of the Al 2124 MMC

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