Fretting fatigue failure of an aero engine turbine blade

Tang, Haijun; Cao, D.G.; Yao, Hongxun; Xie, Miao; Duan, Ruichun

doi:10.1016/j.engfailanal.2008.07.010

Cited by 26 publications

(14 citation statements)

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“…Several factors affected the fretting fatigue behavior of materials, in which contact pressure, coefficient of friction, slip amplitude, and cyclic axial stress are relatively important [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

An investigation into failure analysis of interfering part of a steam turbine journal bearing

Mehdizadeh

Khodabakhshi

2014

Case Studies in Engineering Failure Analysis

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Please cite this article as: M. MehdizadehF. Khodabakhshi An investigation into failure analysis of interfering part of a steam turbine journal bearing (2014), http://dx. AbstractJournal bearings as so sensitive parts of steam turbines are very susceptible to failure through different mechanisms of wear, fatigue and crush during service conditions. Failure occurring through these mechanisms lead to turbine completely shut down as a result of interfering in working conditions of bearing different parts. In this research, failed interfered part of a journal bearing related to a 320000 kW steam turbine was examined. Failure analysis investigations were performed by utilizing of stereographic, optical microscopy, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) analysis and hardness test. Surface crush, large amounts of surface cracks, no noticeable changes of failed surface chemical composition and microstructure with significant hardness improvement were the main obtained results. The studies were revealed that the bearing part loosing and inappropriate clearance can produce relative displacements under cyclic gradient loading.This condition was detrimental for the service life of turbine journal bearing via failure through fretting fatigue mechanism.

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Section: Introductionmentioning

confidence: 99%

An investigation into failure analysis of interfering part of a steam turbine journal bearing

Mehdizadeh

Khodabakhshi

2014

Case Studies in Engineering Failure Analysis

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“…More particularly, problems of fretting fatigue, resulting from fatigue coupled with contact loading, are increasingly addressed in the literature. These complex loading conditions are widely pointed out in bolted or riveted joints, in the blade dovetail region of turbo machinery in spline coupling, in complex coupling . Fretting fatigue life depends on factors such as contact pressure, slip amplitude, relative rigidity of the components, loading and frictional conditions, environmental effects, etc.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the cracking energy density and the Smith–Watson–Topper parameters in predicting fretting fatigue lifetime of a steel/aluminum alloy contact

Belloula

Amrouche

Naït-Abdelaziz

et al. 2014

Fatigue Fract Eng Mat Struct

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A B S T R A C T Many multiaxial fatigue parameters are available to estimate the onset of the crack initiation in mechanical components subjected to fretting fatigue conditions. This study focuses on the ability of the cracking energy density parameter to predict the fretting fatigue life. To estimate this, obtained predictions are compared with those given by another commonly used parameter, namely the Smith-Watson-Topper parameter. First, fretting fatigue experiments were achieved using a new designed setup with a mono-contact configuration (aluminum/steel). A finite element model was used to compute the stress/strain fields around the contact zone. Because of the high stress gradient in the contact zone, the estimates of the two fatigue parameters, when using the mechanical quantities on the most loaded material point, lead to too conservative predicted values. It was therefore necessary to define a kind of process zone in which crack nucleation takes place. Using an averaging method to compute stress and strain in this zone, the obtained results show a quite good agreement between the estimated fatigue life and experimental data, whatever the used fatigue indicator. The size of this zone was then compared with the material microstructure and seems to be in the same magnitude that the average grain size.Keywords fretting fatigue; life prediction; cracking energy density; volumetric approach. N O M E N C L A T U R Ea = contact width A = composite compliance E = Young modulus f = yield function F 1 , F 2 = load cells J 2 = second invariant of deviatoric stress tensor k = yield stress K = relative curvature p = cumulative plastic strain rate p(x) = Hertz pressure p 0 = peak contact pressure P l = applied load per unit length Q = tangential force R = load ratio S ij = deviatoric stress tensor X ij = backstress tensor X ef = effective distance H, γ = hardening parameters of Armstrong-Frederick constitutive law σ f , ε f , c, b = material constants ε max = maximum normal strain Correspondence: A. Amrouche.

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“…in 1967, yet remains a cause for concern in 40 years later 6,7 . For obvious reasons, fretting fatigue is particularly important in safety‐critical industries such as aerospace or high‐speed railway 8, 9 …”

Section: Introductionmentioning

confidence: 99%

“…6,7 For obvious reasons, fretting fatigue is particularly important in safety-critical industries such as aerospace or high-speed railway. 8,9 It has been reported that up to 50 variables might influence the magnitude and rate of fretting process. 10 Coefficient of friction, contact pressure and magnitude of slip are considered to be the primary set of variables, which can directly affect the fretting process.…”

Section: Introductionmentioning

confidence: 99%

Multi-axial fretting fatigue behaviour of 35CrMoA steel

Liu

Jiang

et al. 2011

Fatigue &Amp; Fracture of Engineering Materials &Amp; Structures

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A B S T R A C TThe fretting fatigue behaviours in 35CrMoA steel were investigated under conditions of the various contact pressure and the same maximum equivalent stress of cyclic multi-axial loading. The specimens were characterized by optical microscopy and scanning electron microscopy. Results showed that the fretting fatigue life has complex variation with the increase of contact pressure. The different contact pressure also played very important role in fretting wear model and various wear scars were formed. The influence of them at the fretting surface on the fretting fatigue life was finally discussed by the comparison of the experimental and numerical analysis results.

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Fretting fatigue failure of an aero engine turbine blade

Cited by 26 publications

References 1 publication

An investigation into failure analysis of interfering part of a steam turbine journal bearing

An investigation into failure analysis of interfering part of a steam turbine journal bearing

Comparison of the cracking energy density and the Smith–Watson–Topper parameters in predicting fretting fatigue lifetime of a steel/aluminum alloy contact

Multi-axial fretting fatigue behaviour of 35CrMoA steel

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