Journal ArticleDOI
Load shedding effect on constant-ΔK testing
Z. Zhou,F. J. Zwerneman +1 more
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In this paper, the effect of load shedding steps on constant-ΔK testing is investigated and the results show that load levels need to be gradually stepped down to keep the stress intensity factor constant.Abstract:
This paper investigates the effect of load shedding steps on constant-ΔK testing. ASTM fatigue crack growth specimens have been used in constant-ΔK tests for many fatigue investigations. In the tests, load levels need to be gradually stepped down to keep the stress intensity factor constant. This work points out that care should be taken in choosing the length of the step in order to control ΔK variation. Formulas for ΔK as well as crack growth rate variability are derived. The experimental application of these techniques is also presented.read more
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Journal ArticleDOI
The characterization of fatigue crack growth behaviour by constant ΔK control testing
TL;DR: In this article, a test facility, able to control the range of applied load and range of stress intensity factor (ΔK), has been used to determine the fatigue crack growth rates in corner notched specimens of Udimet 720 for stress ratios of 05, 01 and −10 Initially, the results were analysed in terms of the three-point secant data reduction method.
Proceedings ArticleDOI
Acoustic Emission Analysis on Fatigue Threshold Behavior
References
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Journal ArticleDOI
Acoustic emission monitoring of fatigue crack growth
TL;DR: In this paper, the authors used the acoustic emission technique to monitor fatigue crack growth, and attributed the peak load emissions to both crack extension and deformation and fracture events occurring within the crack tip plastic zone, and these emissions have been correlated with the energy released during crack growth.
Book ChapterDOI
Delay Effects in Fatigue Crack Propagation
TL;DR: In this paper, the authors examined the fatigue crack propagation behavior resulting from variations in load for 2024-T3 aluminum alloy, from both a macroscopic and a fractographic point of view.
Journal ArticleDOI
Acoustic emissions of fatigue crack growth
TL;DR: In this paper, acoustic emissions of fatigue crack growth have been monitored and quantitatively correlated with growth rate and the applied range of stress intensity for high cycle fatigue of 2024-T851 aluminum alloy.
Journal ArticleDOI
Effect of loading variables on the acoustic emissions of fatigue-crack growth
TL;DR: In this paper, a series of experiments have been conducted to determine the effect of loading variables such as cyclic frequency, load ratio, and material on acoustic emission from fatigue-crack propagation.