Determination of the length dependence of the threshold for fatigue crack propagation

Tabernig, B.; Pippan, Reinhard

doi:10.1016/s0013-7944(01)00129-1

Cited by 92 publications

(31 citation statements)

References 9 publications

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“…The sample is notched to concentrate the stress at the notch tip and to create a well-defined crack initiation point. As a sharper crack lowers the load needed for crack initiation [24], a three-step notching procedure with decreasing notch radii is used. With a diamond wire saw a circular notch (radius 150 µm) is formed.…”

Section: Sample Preparationmentioning

confidence: 99%

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Enhanced toughness and stable crack propagation in a novel tungsten fibre-reinforced tungsten composite produced by chemical vapour infiltration

et al. 2014

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Abstract. Tungsten is a promising candidate for the plasma-facing components of a future fusion reactor, but its use is strongly restricted by its inherent brittleness. An innovative concept to overcome this problem is tungsten fibre-reinforced tungsten composite. In this article we present the first mechanical test of such a composite material using a sample containing multiple fibres. The in-situ fracture experiment was performed in a scanning electron microscope for close observation of the propagating crack. Stable crack propagation accompanied with rising load bearing capacity is observed. The fracture toughness is estimated using the test results and the surface observation.

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Section: Sample Preparationmentioning

confidence: 99%

“…With a diamond wire saw a circular notch (radius 150 µm) is formed. This notch is deepened using a razor blade polishing technique (details in [24]). The resulting notch radius is approximately 10 µm.…”

Section: Sample Preparationmentioning

confidence: 99%

Enhanced toughness and stable crack propagation in a novel tungsten fibre-reinforced tungsten composite produced by chemical vapour infiltration

et al. 2014

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“…After pre-cracking in compression, the load amplitude at the desired stress ratio, R, is increased in steps until the threshold value of the long crack is reached. If no crack extension takes place, the applied K is smaller than the effective threshold (because the crack is open, the closure stress intensity at the beginning is in compression, K cl is smaller than -K effth [6]. If K is larger than K effth a crack extension takes place.…”

Section: The Stepwise Increasing Load Amplitude Testmentioning

confidence: 99%

“…This reduces then the size of zone with residual tensile stress. Another possibility is also to reduce the load amplitude for the compression pre-cracking [6].…”

Section: Effect Of Compressive Overloads On the R-curve For Kthmentioning

confidence: 99%

Load history effects on fatigue crack propagation: Its effect on the R-curve for threshold

Zhou¹,

Hohenwarter²,

Leitner³

et al. 2015

Frattura Ed Integrità Strutturale

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ABSTRACT. The study deals with the effect of load history during threshold and fatigue crack propagation measurements in the near threshold regime. The compression pre cracking and the stepwise increasing load amplitude test was applied. The effects of pre-cracking as well as the effect of compression and tension overloads after the pre-cracking on the long crack threshold and on the R-curve of the threshold of stress intensity range are analysed.

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“…[7] A schematic experimental setup is shown in Figure 2. The width W of the sample was 20 mm, and the thickness B was 6 mm.…”

Section: B Experimentsmentioning

confidence: 99%

Failure Mechanisms in a Fatigue-Loaded High-Performance Powder Metallurgical Tool Steel

Jesner

Pippan

2009

Metall Mater Trans A

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High-performance powder metallurgical (PM) produced tool steels are often subjected to fatigue loading. The lifetime of such components can be dominated by fatigue damage. Hence fatigue crack growth curves were determined for different heat treatments at positive and negative stress ratios. The fracture processes are analyzed by fractographic methods. Despite the brittleness of the investigated material the fatigue crack propagation behavior in the lower Paris regime is similar to the behavior of ductile alloys. The fatigue crack growth mechanisms in the upper Paris regime were examined by single overload experiments. On the basis of these investigations, a schematic model is proposed for the different fracture mechanisms in a fatigueloaded PM tool steel for two different heat-treatment conditions.

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Determination of the length dependence of the threshold for fatigue crack propagation

Cited by 92 publications

References 9 publications

Enhanced toughness and stable crack propagation in a novel tungsten fibre-reinforced tungsten composite produced by chemical vapour infiltration

Enhanced toughness and stable crack propagation in a novel tungsten fibre-reinforced tungsten composite produced by chemical vapour infiltration

Load history effects on fatigue crack propagation: Its effect on the R-curve for threshold

Failure Mechanisms in a Fatigue-Loaded High-Performance Powder Metallurgical Tool Steel

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