Effect of Contact Pressure on Fretting Fatigue of High Strength Steel and Titanium Alloy

Nakazawa, Kôzô; Sumita, Masato; Maruyama, Norio

doi:10.1520/stp25824s

Cited by 40 publications

(16 citation statements)

References 9 publications

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“…The fatigue life of fretted components decreases considerably with an incipient increase in the contact pressure, but when the pressure attains a certain level a further increase leads to a longer life time under certain loading conditions [5]. In this paper, an attempt is made to explain this behaviour by invoking a critical influence of contact friction and pressure on fretting fatigue crack growth.…”

Section: Introductionmentioning

confidence: 98%

Influence of Contact Loading on Fretting Fatigue Behaviour

Faanes

Fernando

1994

Fatigue Fract Eng Mat Struct

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Fretting induced cracking is commonly observed in industrial components that are in contact and are subjected to small oscillatory movements between them. Fretting causes a considerable reduction in fatigue strength. In this paper recent knowledge on the short and long crack growth behaviour is applied to estimate crack propagation and fatigue life in fretting. The model is based on mode I stress intensity factors with a threshold modified for short cracks. The predicted results are compared with experiments and the influence of the contact pressure is examined. A good correlation between predictions and experimental results are obtained for crack growth rates as well as fatigue lives in terms of number of cycles to failure. It is seen that the increase of fatigue life observed for contact pressures above a certain level can be predicted by the crack growth model. NOMENCLATUREa, ai = crack length, initial crack length a, = crack length correction da/dN = crack growth rate f= Q/P = ratio of contact friction and normal force P = contact normal force Q = contact friction force R = stress ratio s = pad span K,,,,,, = stress intensity factor caused by maximum stress of bulk load KQ,,,, = stress intensity factor caused by the maximum value of Q K p = stress intensity factor caused by the constant P &(a) = threshold stress intensity factor as a function of crack length AK,, = effective stress intensity range ALKth(m) = threshold stress intensity factors for long cracks Aoax = stress range of axial load Ao,, = smooth specimen fatigue limit

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Section: Introductionmentioning

confidence: 98%

Influence of Contact Loading on Fretting Fatigue Behaviour

Faanes

Fernando

1994

Fatigue Fract Eng Mat Struct

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“…Under different contact pressure, the fatigue source region has similar characteristics, but there is a difference in its depth. Adibnazari and Hoeppner [15] and Nakazawa et al [16] studied the influence of contact pressure on life for varied materials. They found that life is decreased firstly with the increase of contact pressure, and then remains unchanged.…”

Section: Metallographic Observation and Fracture Analysismentioning

confidence: 99%

Observation of fretting fatigue cracks of Ti6Al4V titanium alloy

Zhi-yan

Liu

et al. 2017

Materials Science and Engineering: A

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Using a test system developed in laboratory, the fretting fatigue mechanism of Ti6Al4V alloy has been studied, with analyses of fracture morphology and composition. The results show that fretting fatigue source area is semi-elliptical and occupies a small proportion of the total fracture surface. The area is relatively flat and smooth and shows traces of friction. With the increase of contact pressure, the depth of the source region first increases rapidly and then stabilizes, but the fatigue strength decreases rapidly and then stabilizes. Fretting causes severe oxidation of the surface. In the interface between the source and the fatigue propagation zone, the contents of O and Fe drop sharply.

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“…On the other hand, although the tests are easy and quick to conduct, their interpretation is correspondingly very difficult. There have been a number of attempts to analyse the bridge-foot contact problem, notably by Hattori and Nakazawa using a boundary element method [8,9]. Recently, Noraphaiphipaksa et.…”

Section: Cantilever Specimenmentioning

confidence: 99%