Aspects of equivalence between contact mechanics and fracture mechanics: theoretical connections and a life-prediction methodology for fretting-fatigue

Giannakopoulos, A.E.; Lindley, T.C.; Suresh, S.

doi:10.1016/s1359-6454(98)00011-1

Cited by 180 publications

(109 citation statements)

References 26 publications

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“…The term 'notch-like' is used since the effect of fretting in fatigue can be likened to that of a mechanical notch as concentrated stresses can be found at the edge of the contact region much like a notch tip [9][10][11][12][13][14]. Significant fretting problems have been seen to be greatly influenced by two mechanical parameters; (a) frictional force, and (b) contact pressure.…”

Section: Fretting Notch-like Sensitivity Q Fmentioning

confidence: 99%

“…(1) where k f = σ w 0 σ wf and k t = σ f σ a (11) and (12) Definitions of the fatigue notch factor, k f and stress concentration factor, k t differ slightly to adapt to the context of fretting fatigue where k f is the ratio between the fatigue limit at 10 7 cycles without fretting, σ w0 and 10 7 cycles with fretting, σ wf . As for k t , σ a is the stress amplitude inflicted on the fatigue specimen while σ f is the fretting fatigue stress amplitude, defined by the regular amplitude stress and includes the effect of friction coefficient and contact pressure (fretting parameter).…”

Section: Fretting Notch-like Sensitivity Q Fmentioning

confidence: 99%

“…Example cross section of steel shaft with combined stresses from stress concentrated corner and fretting due to perpetual sliding. Failure occurred region of fretting wear, ignoring the stress concentration at the corner [2] Drawing parallels between notch fatigue and fretting fatigue in the context of recognising the initial crack phase can be seen when comparing a typical frictional contact stress state where the edge of the contact region often experiences a concentrated point load, much like the tip of a notch [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stress Raisers and Its Effect on Fatigue Sensitivity: A Study of Notch and Fretting Fatigue

Rahmat¹,

Ibrahim²,

Oskouei³

2013

ujme

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In this study, stress raisers (notches, fretting fatigue and a combination of notch and fretting) were taken into consideration as to its performance in reducing fatigue life. Reduction factor measurements using fatigue sensitivity, q as an effect of the respective stress raiser on fatigue lives were done. Finite element analyses on the consequence of clamping pressure on a notched geometry revealed a further increase in stress concentration at the notch tip for this specific geometry. However, fatigue tests revealed no significant difference in the fatigue lives between the notched and the combined notch and fretting fatigue. Fatigue notch sensitivity, q n was found to be between 0.42 and 0.65 while a fretting notch-like sensitivity, q f calculated from fretting fatigue results using a method by Wharton et al were 3.52 and 3.28 at torque levels 20 Nm and 50 Nm respectively. It was found that the stress concentration factor, k t for the fretting condition was conservative in its value and did not correlate well with the actual fretting reduction factor, k f . Finally, fractorgraphic analysis revealed significant wear for both fretting fatigue specimens and the combined notch and fretting fatigue. However, cracks were only found to originate from the notch tip for the combined notch and fretting fatigue at all alternating stress levels.

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Section: Fretting Notch-like Sensitivity Q Fmentioning

confidence: 99%

Section: Fretting Notch-like Sensitivity Q Fmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Stress Raisers and Its Effect on Fatigue Sensitivity: A Study of Notch and Fretting Fatigue

Rahmat¹,

Ibrahim²,

Oskouei³

2013

ujme

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“…On the other hand, some works [11][12][13] have shown that the fretting fatigue can be modelled as a notch problem, due to the fact that in both cases the fatigue exist, a multiaxial stress state and high stress gradients. In this setting, this approach allows the use of different methods to estimate the fatigue life, normally used to assessment the notched components, in some fretting fatigue cases.…”

Section: Introductionmentioning

confidence: 99%

Numerical fatigue life estimation of aluminium 6201-T81 wires containing geometric discontinuities.

et al. 2018

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Abstract. Previous works have shown that fretting fatigue can be modelled as a notch problem due to the mild superficial damage produced in the partial slip regime during fretting. In this context, the aim of this numerical and experimental study is to estimate the fatigue life of aluminium 6201-T81 wires, used in overhead conductors, containing geometric discontinuities. These discontinuities induce a stress field analogous to the fretting problem. To perform the fatigue life assessments the LM-Nf relationship, which is an extension of the Theory of Critical Distance (TCD), was applied. The LM-Nf relationship was calibrated using two S-N curves, one of a plain wire and other of a notched wire. The validation of the numerical approach estimations was performed using a wire containing a through hole. The estimations were fallen almost entirely among factor 3 bands when compared with the experimental results. This factor 3 represents the biggest scatter in the S-N curves used to calibrate the LM-Nf relation. The TCD approach applied, in terms of point method, provide accurate life estimations in the range 10 5 and 10 6 cycles.

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“…To date, the approach to life prediction using these measures has been largely empirical. However, a recent attack has been launched on the behavior of cracks emerging from the most highly stressed region at the edge of a fretting peg [7], and a preliminary study of the plasticity taking place in the contact zone has been published [8].…”

Section: Introductionmentioning

confidence: 99%

Plasticity in fretting of coated substrates

Begley

Hutchinson

1999

Engineering Fracture Mechanics

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A detailed analysis is performed of the plastic deformation in a metal substrate fretted by a¯at-bottomed circular peg under steady normal load and cyclic tangential load. The substrate is coated with a thin layer of soft metal. Two limiting asymptotic problems are identi®ed which characterize small scale yielding behavior in the substrate in the vicinity of the corners of the peg. Deformation within the plastic zone is characterized, including regions of elastic shakedown, steady reversed cyclic plastic straining, and strain ratchetting. Implications for nucleation of fretting cracks are discussed. #

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Aspects of equivalence between contact mechanics and fracture mechanics: theoretical connections and a life-prediction methodology for fretting-fatigue

Cited by 180 publications

References 26 publications

Stress Raisers and Its Effect on Fatigue Sensitivity: A Study of Notch and Fretting Fatigue

Stress Raisers and Its Effect on Fatigue Sensitivity: A Study of Notch and Fretting Fatigue

Numerical fatigue life estimation of aluminium 6201-T81 wires containing geometric discontinuities.

Plasticity in fretting of coated substrates

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