A practical methodology to select fretting palliatives: Application to shot peening, hard chromium and WC-Co coatings

Kubiak, Krzysztof; Fouvry, S.; Maréchal, Alenka Majcen Le

doi:10.1016/j.wear.2005.01.030

Cited by 26 publications

(16 citation statements)

References 18 publications

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“…Tangential force (Q) and relative displacement (δ) were recorded continuously, which allowed to characterise every fretting cycle with a characteristic fretting loop (Fig. 1b) [10]. Tests were performed at 23ºC in laboratory ambient conditions at 40-45% relative humidity.…”

Section: 2mentioning

confidence: 99%

“…By integrating surface of this loop one can calculate energy dissipated (E d ) for every individual cycle and by adding energy dissipated in all cycles, Cumulated Dissipated Energy ΣE d can be estimated. This energy approach has several advantages over classical Archard theory and is more accurate in case of variable loading conditions and material configurations [10]. Wear volume has been calculated from 3D morphologies measured on plan specimens (Fig.…”

Section: 3mentioning

confidence: 99%

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Surface morphology in engineering applications: Influence of roughness on sliding and wear in dry fretting

Kubiak

Liskiewicz

Mathia

2011

Tribology International

151

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Influence of initial surface roughness on friction and wear processes under fretting conditions was investigated experimentally. Rough surfaces (Ra=0.15-2.52 µm) were prepared on two materials: carbon alloy (AISI 1034) and titanium alloy (Ti-6Al-4V). Strong influence of initial surface roughness on friction and wear processes is reported for both tested materials. Lower coefficient of friction and increase in wear rate was observed for rough surfaces. Wear activation energy is increasing for smoother surfaces. Lower initial roughness of surface subjected to gross slip fretting can delay activation of wear process and reduce wear rate, however it can slightly increase the coefficient of friction. Graphical Abstract

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Section: 2mentioning

confidence: 99%

Section: 3mentioning

confidence: 99%

Surface morphology in engineering applications: Influence of roughness on sliding and wear in dry fretting

Kubiak

Liskiewicz

Mathia

2011

Tribology International

151

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“…1). Therefore, the fretting damage mode depends on sliding conditions, leading to cracking under PS and wear under FS condition [1]. Fretting is a dynamical process where sliding conditions and surface morphology of contacting materials can vary with time.…”

Section: Introductionmentioning

confidence: 99%

Interface roughness effect on friction map under fretting contact conditions

Kubiak

Mathia

Fouvry

2010

Tribology International

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Abstract:In many industrial applications where fretting damage is observed in the contact (e.g. rotor/blade, electrical contacts, assembly joint, axe/wheel, clutch) the external loadings or geometry design cannot be changed.Therefore, the surface preparation and finishing process become essential to control and reduce the damage caused by fretting. In this paper, the authors present the experimental study of the initial surface roughness and machining process influence on fretting conditions in both partial and full sliding regimes. Surfaces prepared by milling and smooth abrasive polishing processes have been analysed. The influence of roughness on sliding behaviour and analysis of friction have been reported. Also, the contact pressure influence and qualitative analysis of fretting wear scar have been presented.

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“…Also some brittle materials [52][53][54], like ceramics, which have been shot peened with proper shot peening parameters, have shown an increase in fatigue strength.…”

Section: Shot Peeningmentioning

confidence: 99%

Residual Stresses and Fatigue of Shot Peened Cast Iron

Lundberg¹

2013

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ii Cover:Fracture surface of compact graphite iron with a graphite nodule.Printed by: LiU-Tryck, Linköping, Sweden, 2013 ISBN 978-91-7519-501-8 ISSN 0280-7971 Distributed by: Linköping University Department of Management and Engineering 581 83, Linköping, Sweden ©2013 Mattias Lundberg iii AbstractThe complex geometry of cylinder head in heavy-duty diesel engine makes grey cast iron or compact graphite iron a perfect material choice due to its castability, thermal conductivity and damping capacity. To increase the efficiency of the engine, the fatigue property of the material needs to be improved. Shot peening is often used to increase the fatigue strength of components. The benefits are associated with the compressive stresses induced and with surface hardening. In this research project, these effects on grey and compact iron have been analyzed for different shot peening parameters using XRD, SEM and fatigue testing methods. The ultimate aim of the project is to increase the fatigue strength of cast irons by optimization of residual stresses.The XRD measurements and SEM examinations revealed that the shot peening parameters including shot size and peening intensity had significant influences on the resulted residual stresses and strain hardening while changing the coverage made little difference. Also differences in the peening results between the two materials were observed, which were ascribed to an effect of the different graphite morphology. Nevertheless, a residual stress profile similar to the one general considered to improve the fatigue strength in steels could be obtained in both grey and compact iron after shot peening.The axial fatigue testing with R=-1 on the grey iron showed that peening using large shot size and high peening intensity (heavy shot peening) resulted in a fatigue strength reduction of 15-20% in comparison with the mechanically polished surface. The negative effects are likely related to surface damage and relatively high tensile residual stresses in subsurface induced by the heavy peening. Grey cast iron has low ductility in tension and therefore tensile residual stresses may promote multiple cracking and crack networking during cyclic loading.Shot peening using much smaller shots and lower intensity (gentle shot peening) which resulted in a much smaller residual stress field gave no significant changes in fatigue strength. However, a short time annealing at 285°C of specimens being gently shot peened increased the fatigue strength roughly by 10%. The improvement could be an effect of precipitates formed due to the heat treatment, which lock the dislocation movement under cyclic loading. iv v

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A practical methodology to select fretting palliatives: Application to shot peening, hard chromium and WC-Co coatings

Cited by 26 publications

References 18 publications

Surface morphology in engineering applications: Influence of roughness on sliding and wear in dry fretting

Surface morphology in engineering applications: Influence of roughness on sliding and wear in dry fretting

Interface roughness effect on friction map under fretting contact conditions

Residual Stresses and Fatigue of Shot Peened Cast Iron

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