Open Access
Some formulas for the crack opening stress level
TLDR
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).read more
Citations
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Journal ArticleDOI
An engineering model of fatigue crack growth under variable amplitude loading
TL;DR: In this paper, the concept of an equivalent stress intensity factor (SIF) range corresponding to R = 0 and a modified Wheeler model are introduced, which lead to a fatigue life prediction model that depends mainly on the stress ratio and the plastic zone size ahead of the crack tip.
Journal ArticleDOI
Study of fatigue crack characteristics by acoustic emission
A. Berkovits,Daining Fang +1 more
TL;DR: In this article, an acoustic emission (AE) technique was used to investigate fatigue crack characteristics such as initiation closure and propagation on smooth specimens of Incoloy 901 at room temperature, over the range of stress ratios −1.0⩽ R ⩽ 0.2.
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Fatigue crack growth and damage tolerance
TL;DR: In this article, the authors discuss the difference between the analysis tools needed for ab initio design and sustainment, modelling of cracks that grow from small naturally occurring material discontinuities and ways to determine the short crack da/dN versus ΔK data from long crack American Society for Testing and Materials (ASTM) tests.
Journal ArticleDOI
Improved modeling of the effect of R-ratio on crack growth rate
TL;DR: In this article, a simple crack growth rate equation has been proposed, which can condense the crack growth data under different R -ratios to the curve corresponding to R ǫ = 0.
Journal ArticleDOI
The applicability of magnesium based Fibre Metal Laminates in aerospace structures
TL;DR: In this article, the application of magnesium alloys in Fibre Metal Laminates is discussed, and the effect of the properties on the overall FML behavior has been addressed, using knowledge and prediction models developed for current FMLs.
References
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Book ChapterDOI
The Significance of Fatigue Crack Closure
TL;DR: Al alloy sheet fatigue crack closure under cyclic tensile loading, deriving expression for crack propagation rate in terms of effective stress amplitude as discussed by the authors, was derived for the first time in the literature.
Book ChapterDOI
A Simple Crack Closure Model for Prediction of Fatigue Crack Growth Rates Under Variable-Amplitude Loading
TL;DR: In this article, a model for the prediction of growth rates of fatigue cracks in aluminium alloys is presented based on an approximate description of the crack closure behavior and can be used to predict effects of crack growth acceleration and retardation observed experimentally under variable-amplitude loading.
NLR test results as a database to be used in a check of crack propagation prediction models: A Garteur activity
TL;DR: In this article, a joint Garteur activity in the field of the prediction of crack propagation under variable amplitude loading was described, where existing crack propagation models or models under development were checked with NLR crack propagation data of 202U-T3 Alclad 2 mm sheet material under F-27 Spectrum flight simulation loading.