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Crack closure

About: Crack closure is a research topic. Over the lifetime, 28157 publications have been published within this topic receiving 588158 citations.


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Journal ArticleDOI
TL;DR: In this paper, a two-stage replica technique was used to examine the crack profile using a two stage replica technique and by monitoring the crack raouth opening displacement, and it was found that the crack growth rates measured in the range 0·05 ≦R≦ 0·7 showed a singular dependence on the parameter Δθ which approximates to the change in angle subtended by the crack faces.
Abstract: — Fatigue crack closure in commercial titanium has been investigated by examining the crack profile using a two-stage replica technique and by monitoring the crack raouth opening displacement. The replicas show that when closure occurs the crack does not close back from the crack tip but at discrete contact points along the crack faces. The observed closure mechanism is therefore quite different from the generally accepted model. Assuming that the contact points wedge the crack open, the stress intensity at the minimum load is greater than expected and the range of the stress intensity is effectively reduced. Also, it was found that the crack growth rates measured in the range 0·05 ≦R≦ 0·7 showed a singular dependence on the parameter Δθ which for SEN specimens approximates to the change in angle subtended by the crack faces. It is therefore suggested that there is a direct link between Δθ and the effective stress intensity amplitude.

224 citations

Journal ArticleDOI
TL;DR: In this article, the authors developed a predictive capability for the quantitative assessment of crack growth under fatigue loadings, which can be applied expediently to examine the combined influence of crack geometry, complex loadings and material properties.

223 citations

Journal ArticleDOI
TL;DR: In this paper, a micro-roughness model was proposed to rationalize fatigue crack growth retardation due to load excursions, and it was argued that crack closure arising from residual tensile displacements is not the primary mechanism for growth attenuation following a peak tensile overload.

223 citations

01 Jan 1980
TL;DR: In this article, a good correlation was obtained for ΔK eff / ΔK = 0.33 R + 0.12 R 2 for high crack rates (> 1 μm/c.
Abstract: Crack growth data for 2024-T3 sheet material were analysed with different formulas for ΔK eff as a function fo the stress ratio R . The data covered R values from −1.0 to 0.54. A good correlation was obtained for ΔK eff / ΔK = 0.55 + 0.33 R + 0.12 R 2 The relation between log d a/ d n and log ΔK eff was non-linear for high crack rates (> 1 μm/c).

222 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023219
2022536
2021143
2020154
2019172
2018244