Life prediction of fretting fatigue with advanced surface treatments

Golden, Patrick J.; Shepard, M. J.

doi:10.1016/j.msea.2006.10.168

Cited by 56 publications

(28 citation statements)

References 19 publications

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“…The typical thickness of these coatings is 1 to 5 µm. These coatings show some promise particularly under milder fretting conditions in the partial slip regime for which the coating will not become damaged [111,113]. The primary mechanism leading to the improvement in life is the reduction in the COF, for example, from 0.7 to 0.25 in one study [113].…”

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confidence: 99%

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The Fretting Fatigue Behavior of Ti-6Al-4V

Neu

2008

KEM

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Abstract. This paper reviews the understanding of fretting fatigue with an emphasis on the behavior of Ti-6Al-4V. Advances in life prediction and assessment approaches are highlighted. The role of microstructure on fretting fatigue and its use to detect fretting fatigue damage can now be considered in assessment strategies. Various palliatives are used to enhance the fretting fatigue resistance. These include treatments to introduce compressive residual stress and surface coatings that reduce friction and/or protect the underlying structural material. IntroductionThis paper reviews the tremendous progress over the past decade to understand and predict the fretting fatigue behavior of Ti-6Al-4V, a common alloy used in applications requiring high specific strength. Fretting fatigue is of particular concern for dovetail attachments between the blades and disks in compressors of aerospace gas turbines, spline couplings of shafts, and mechanical joints in orthopedic implants. In the past decade there has been considerable focus on the fretting fatigue behavior of the duplex microstructure consisting of 60 vol. % equiaxed primary α (hcp structure) and 40 vol. % secondary lamellar α+β domains about 10 to 15 µm in size composed of alternating lathes of α and bcc-structured β. This was the baseline microstructure used for several projects carried out under the Air Force High Cycle Fatigue (HCF) program from 1995 to 2005 [1,2]. Unless noted otherwise, the majority of the data reported in this review was generated on this or similar microstructure. The microstructure has an initial random texture with yield strength 930 MPa, ultimate tensile strength 978 MPa, and cyclic yield strength of 797 MPa [1].The fretting fatigue process can be divided into two parts. The first is the formation of fretting cracks and the second is the growth of fretting fatigue cracks. The drivers for each of these processes are different. Both processes must occur to realize a catastrophic fretting fatigue failure. If fretting cracks do not form, fretting fatigue will not occur. But even if fretting cracks form, a catastrophic fretting fatigue failure will not occur if these cracks do not grow outside of the fretting fatigue process volume (FFPV) associated with the formation of the crack. Hence, the fretting fatigue limit is associated with the threshold limit for propagating the fretting cracks. In most fretting fatigue experiments and in applications, the drivers for fretting crack formation and crack growth outside of the FFPV cannot be easily separated, so there is an apparent coupling between the two. However, experiments involving the independent control of the drivers for fretting crack formation and crack growth (e.g., [3,4]) suggest that these two processes can be separated for the purposes of material response and prediction analyses. This is extremely helpful in understanding how different palliatives mitigate the fretting drivers. Some palliatives are aimed at fretting crack formation while others at reducing the fretting fatigue crack...

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“…The most common processes include shot peening [105][106][107][108][109][110][111][112], laser shock peening (LSP) [110,111,113], and low plasticity burnishing (LPB), also known as deep rolling [34,108,111,113,114]. Both LSP and LPB generate considerably deeper compressive residual stresses while inducing less cold work compared to shot peening.…”

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The Fretting Fatigue Behavior of Ti-6Al-4V

Neu

2008

KEM

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“…The influence of the geometry of the contacting surfaces on fretting has been studied both experimentally and theoretically. [20][21][22][23] The conclusion of these studies is that as surface roughness increases fretting resistance also increases. The roughness of surfaces restricts the actual contact to a number of small areas at the peaks of the surface asperities.…”

Section: Effects Of Surface Conditionmentioning

confidence: 99%

Multiscale Wavelet-Based Analysis and Characterization of Fretting Fatigue Damage in Titanium Alloys

Frantziskonis

Matikas

2009

Mater. Trans.

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Wavelet analysis is used to rationalize information at various scales in several branches of science, including particle physics, biology, electrical engineering, fluid mechanics, and medicine. However, this powerful technique has not been applied extensively to characterize structures of materials, fretting damage for the present case, even though many critical questions could be addressed. In particular, the following unsolved problems are considered in this paper: (a) The first problem deals with the quantitative characterization of fretted surfaces in a Ti-6Al-4V alloy. This is investigated by analyzing profilometric digital images of fretted surfaces obtained in a range of magnifications. Wavelet analysis of the data is able to identify, by examining the wavelet coefficients, dominant length scales as those regions in scale-space where the energy of the wavelet transform and/or peaks of local concentration dominate. For the range of magnifications examined, i.e. from 1:25Â to 100Â, the $20Â magnification is identified as the one with the most useful information. (b) An alternative procedure is employed for the second use of wavelets which deals with the non-uniformity of the contact regions. Wavelet analysis is employed to identify partially slipping regions, which result in the ''pattern'' of the fretted surface morphology.

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“…LSP has been utilized for improving surface mechanical properties of structural materials with coarse grains (grain size up to a micrometer), such as aluminum [6] , nickel-based super-alloys [7] , titanium [8] , magnesium alloys [9] , stainless [10] and carbon steels [11] . However, only a few reports describe LSP of ultrafine-grained (UFG) materials (sub-micron grain size).…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Hardness of Laser Shocked Ultra-fine-grained Aluminum

He¹,

Xiong²,

Guo³

et al. 2011

Journal of Materials Science & Technology

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Ultra-fine-grained commercial purity aluminum was produced by severe cold rolling, annealing and then straining at ultra-high rate by a single pass laser shock. Resulted microstructure was investigated by transmission electron microscopy. Microhardness of annealed 0.6 µm ultra-fine grained aluminum increased by 67% from 24 to 40 HV. Many 0.3 µm sub-grains appeared at the shock wave center after a single pass laser shock, while high density dislocation networks were observed in some grains at the shock wave edges. Accordingly, microhardness at the impact center increased by 37.5% from 40 to 55 HV. From the impact center to the edge, microhardness decreased by 22% from 55 to 45 HV.

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Life prediction of fretting fatigue with advanced surface treatments

Cited by 56 publications

References 19 publications

The Fretting Fatigue Behavior of Ti-6Al-4V

The Fretting Fatigue Behavior of Ti-6Al-4V

Multiscale Wavelet-Based Analysis and Characterization of Fretting Fatigue Damage in Titanium Alloys

Microstructure and Hardness of Laser Shocked Ultra-fine-grained Aluminum

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