Slow Fatigue Crack Growth and Threshold Behaviour in Air and Vacuum of Commercial Aluminium Alloys

Kirby, B.R.; Beevers, C.J.

doi:10.1111/j.1460-2695.1979.tb00378.x

Cited by 114 publications

(46 citation statements)

References 33 publications

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“…As such, large, recrystallized grains are seen to enhance fatigue performance in alloy B compared to alloy A, in keeping with the results of Kirby et al [22]. This is also highlighted by the relatively poor performance of alloy D, exhibiting a very fine structure.…”

Section: Fatigue Tests Resultssupporting

confidence: 86%

Analytical modelling of the influence of local mixed mode displacements on roughness induced crack closure

Kamp

Gao

Starink

et al. 2007

International Journal of Fatigue

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Application of crack closure analytical modelling to predict the behaviour of complex fatigue crack growth properties is limited partly due to restricted two dimensional modelling approaches. An analytical model of roughness induced crack closure (RICC) is developed in the present paper considering a three dimensional twisted and kinked crack path. Residual shear deformations at asperities in the crack wake affect the crack opening generating closure. These residual shear deformations are explicitly formulated from 1 residual plastic deformation. The respective influence of the in-plane and out-of-plane deformation on RICC is discussed. The crack twisting is found to be a less significant effect on the RICC than the crack kinking, for similar deviation angles. However, these out-of-plane crack deflections are found to be non negligible particularly at low tilting angles. This analytical model is used to predict the closure stress intensity factor for a range of 2xxx aluminium alloys. Predictions are compared to experimental results obtained from low ΔK fatigue crack growth tests. Experimental results show that fatigue performance scale with closure level and roughness of the failed fatigue specimen surfaces. Comparison of estimated and measured closure stress intensity factor show similar trends.

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Section: Fatigue Tests Resultssupporting

confidence: 86%

Analytical modelling of the influence of local mixed mode displacements on roughness induced crack closure

Kamp

Gao

Starink

et al. 2007

International Journal of Fatigue

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“…Alloy 2 has large, recrystallised grains compared to Alloys 1 and 3 which have an unrecrystallised, fine grain structure. As such, large, recrystallised grains are seen to enhance fatigue performance in Alloy 2 compared to Alloys 1 and 3, as previously shown in the literature [11].…”

Section: Strengthening Precipitates and Tensile Propertiessupporting

confidence: 81%

Influence of grain structure and slip planarity on fatigue crack growth in low alloying artificially aged 2xxx aluminium alloys

Kamp

Gao

Starink

et al. 2007

International Journal of Fatigue

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The fatigue crack growth behaviour under constant amplitude loading of three low alloying artificially aged 2xxx aluminium alloys with distinct microstructures is analysed. Fatigue crack growth tests show a correlation between fatigue performance and the occurrence of crack closure. Fractography and fracture surface measurements show that rougher surfaces give higher closure levels suggesting a dominating influence of roughness induced crack closure in these alloys. The relationship between the crack path and the microstructure, i.e. grain structure and slip planarity, is assessed semi-quantitatively. A criterion to evaluate the propensity for slip band formation is derived and reasonable correlation is found between the fatigue fracture behaviour of the three alloys and this criterion.

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“…7 were to be extended to the near-threshold, transitina! growth-rate behavior observed in precipitationhardened alloys such as those in the aluminum family [44][45][46][47] or others [48], thin-foil transmission electron microscopy might well be required to determine the mean free path 2 between obstacles that effectively obstruct slip-band transmission. Such…”

Section: Akth a Vy/ (7)mentioning

confidence: 99%

A Critical Analysis of Grain-Size and Yield-Strength Dependence of Near-Threshold Fatigue Crack Growth in Steels

Yoder

Cooley

Crooker

1983

Fracture Mechanics: Fourteenth Symposium—Volume I: Theory and Analysis

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Near-threshold fatigue crack growth behavior has been analyzed for a broad selection of steels surveyed from the literature. It is clear first of all that apparent values of the threshold stress-intensity factor (ΔKth) can vary widely, roughly an order of magnitude. Though in many instances actual ΔKth values are difficult to define rigorously, a pronounced transition point or “knee” is apparent in the near-threshold region of the conventional logarithmic plot of fatigue crack growth rate (da/dN) as a function of stress-intensity range (ΔK). Though the values of ΔK associated with these transition points (ΔKT) for an individual steel may tend to exhibit a functional dependence on yield strength (σys) or grain size (¯ℓ)—as is the case, for example, with a low-carbon ferritic steel—it is unmistakably clear that for the gamut of steels examined (15 cases), the transition points do not order on the basis of either σys or ¯ℓ alone. Rather, values of ΔKT for the gamut of steels order on the basis of a synergetic interaction of σys and ¯ℓ, according to the equation, ΔKT=5.5σysℓ¯. This relationship was derived in the cyclic plastic zone model of fatigue crack growth established in our prior work with titanium alloys. In further agreement with this model, ΔKT has been identified for these steels as the point at which the cyclic plastic zone attains the mean grain size. The significance and implications of these findings appear far-reaching, as the steels surveyed include those of both high and low strength, a wide range of effective grain sizes (mean free path in the case of high-strength steel), and a host of microstructural types (ferritic, martensitic, pearlitic, bainitic, and austenitic).

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Slow Fatigue Crack Growth and Threshold Behaviour in Air and Vacuum of Commercial Aluminium Alloys

Cited by 114 publications

References 33 publications

Analytical modelling of the influence of local mixed mode displacements on roughness induced crack closure

Analytical modelling of the influence of local mixed mode displacements on roughness induced crack closure

Influence of grain structure and slip planarity on fatigue crack growth in low alloying artificially aged 2xxx aluminium alloys

A Critical Analysis of Grain-Size and Yield-Strength Dependence of Near-Threshold Fatigue Crack Growth in Steels

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