Effect of extrusion aspect ratio and test temperatures on fatigue crack growth behavior of a 2099-T83 Al–Li alloy

Goma, Franck Armel Tchitembo; Larouche, Daniel; Bois-Brochu, Alexandre; Blais, Carl; Boselli, Julien; Brochu, Mathieu

doi:10.1016/j.ijfatigue.2013.08.013

Cited by 23 publications

(6 citation statements)

References 20 publications

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“…Modeling Condition 1 demonstrated that the largest increase in fatigue life was seen at low stress levels. The high increases in fatigue life at low stresses is consistent with literature showing that environmental cracking is exacerbated at low Δ K but has a less potent impact at higher Δ K levels where the mechanical driving force dominates 59 …”

Section: Discussionsupporting

confidence: 88%

“…First, it is critical that laboratory‐generated environment‐specific growth rate data exhibit similitude with components across a wide range of stress intensities. This is particularly relevant for AA7075‐T651 in high‐altitude environments where both temperature and crack wake roughness can compromise similitude for constant Δ K and bulk environment (e.g., P H2O / f ) conditions 13–16,19,22,36,51,56,59,60 . Second, the current approach assumes that there is no transient upon transitioning between environments.…”

Section: Discussionmentioning

confidence: 99%

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Incorporation of high‐altitude environmental effects in the linear elastic fracture mechanics‐based modeling of aluminum alloy 7075

Brown

Dorman

Burns

2022

Fatigue Fract Eng Mat Struct

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Airframe structural components experience coupled load-environment spectra that are currently not captured in traditional damage-tolerant management approaches. The effect of incorporating fatigue crack growth kinetics relevant to high-altitude flight environments into LEFM-based predictions of fatigue progression for aluminum alloy 7075-T651 was quantitatively assessed for a variety of load-environment spectra using AFGROW. The results of this study demonstrated that in all conditions, the incorporation of high-altituderelevant growth kinetics enhanced the fatigue life predictions. However, the magnitude of the impact on the overall life is dependent upon the subtleties of the coupled load-environment spectrum, despite the fact that environmental effects are most potent in the near-threshold regime of the da/dN versus ΔK relationship. The potential impact to the structural integrity management community is discussed, and remaining challenges and opportunities are identified.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Incorporation of high‐altitude environmental effects in the linear elastic fracture mechanics‐based modeling of aluminum alloy 7075

Brown

Dorman

Burns

2022

Fatigue Fract Eng Mat Struct

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“…Owing to the crack branching diffusion, the increasing numbers of interactively propagating cracks and grain boundaries as well as the crack-precipitate interaction, ultrafine grained 7075 Al alloys had stronger anti-FCG ability than that of coarse-grained alloys, especially at high Δ K level [17]. The FCG rate of alloys will be decelerated with the fall in temperature due to the reduced hydrogen embrittlement [18] and humidity [19]. Irregular fracture surfaces may restrain the water vapour from moving towards the crack tip, thus resulting in a weaker temperature effect [19].…”

Section: Introductionmentioning

confidence: 99%

Study of fatigue crack growth behaviour of Al-Mg and Al-Mg-Sc-Zr alloys

Jiang

Liu

et al. 2023

Materials Science and Technology

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Fatigue crack growth behaviour of Al-Mg and Al-Mg-Sc-Zr alloys is studied under different orientations and stress ratios. The microstructures and the fracture morphologies of each alloy are observed. For both alloys, they have Brass, S and Goss texture; while only Al-Mg alloy has Cube texture which indicates recrystallisation; as fatigue crack propagated, intergranular fracture transformed into transgranular fracture accompanied with gradually coarser crack surfaces. Al-Mg alloy is featured by large recrystallised grain, favourable plasticity, rougher crack surfaces, and with relatively strong crack growth resistance before rapid growth. While Al-Mg-Sc-Zr alloy with small grain size and relatively smoother crack surfaces, shown cyclic stability at higher Δ K level.

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“…The small grains resulted from recrystallization after solution heat treatment, while the large grains are unrecrystallized structures [21,24]. Comparable microstructures were reported for materials of similar type and were attributed to dynamic recovery and the presence of Al 3 Zr [31,32] . It is noted that grains become smaller towards the radius of the billet as can be seen in the micrographs representing T2 and T3 locations and these measure approximately 5-8 μm.…”

Section: Microstructurementioning

confidence: 91%

“…The transverse orientation is the plane of loading in the cyclic axial fatigue. This location possesses the large, unrecrystallized grains which have been recognized to reduce Al-Li resistance to crack growth [24,32]. The susceptibility of large and elongated grains of A356 Aluminum alloys to cracking have been reported by Mo et al [46].…”

Section: Analysis Of Secondary Crack Behaviormentioning

confidence: 95%

Analysis of the Fatigue Damage Behavior of AW2099-T83 Al-Li Alloy under Strain-Controlled Fatigue

Adinoyi¹,

Merah

Albinmousa

2019

Frattura Ed Integrità Strutturale

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Microstructural characteristics, monotonic and strain-controlled cyclic axial behaviors of AW2099-T83 Aluminum-Lithium alloy were investigated. Grain sizes and structures are not uniform in the different orientations studied. High strength and low ductility characterize the tensile behavior of the alloy under static loading. Strain-controlled fatigue testing was conducted at strain amplitudes ranging from 0.3% to 0.7%. Over this range, macro plastic deformation was only observed at 0.7%. Cyclic stress evolution was found to be dependent on both the applied strain amplitude and the number of cycles. Limited strain hardening was observed at low number of cycles, followed by softening, due probably to damage initiation. With low plastic strain, analytical approach was adopted to profile the damaging mechanism for the different applied strain amplitude. Because of the absence of fatigue ductility parameters due to low plasticity, a three-parameter equation was used to correlate fatigue life. Fractured specimens were studied under SEM to characterize the fracture surface and determine the controlling fracture mechanisms. The fractography analysis revealed that fracture at low strain amplitudes was shear controlled while multiple secondary cracks were observed at high strain amplitude. Intergranular failure was found to be the dominant crack propagation mode.

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Effect of extrusion aspect ratio and test temperatures on fatigue crack growth behavior of a 2099-T83 Al–Li alloy

Cited by 23 publications

References 20 publications

Incorporation of high‐altitude environmental effects in the linear elastic fracture mechanics‐based modeling of aluminum alloy 7075

Incorporation of high‐altitude environmental effects in the linear elastic fracture mechanics‐based modeling of aluminum alloy 7075

Study of fatigue crack growth behaviour of Al-Mg and Al-Mg-Sc-Zr alloys

Analysis of the Fatigue Damage Behavior of AW2099-T83 Al-Li Alloy under Strain-Controlled Fatigue

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