The effects of surface texture in reciprocating contacts – An experimental study

Vlădescu, Sorin-Cristian; Olver, A.D.; Pegg, Ian; Reddyhoff, Tom

doi:10.1016/j.triboint.2014.09.015

Cited by 159 publications

(137 citation statements)

References 30 publications

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“…After measuring film thickness in the reciprocating contact using a capacitance technique, they concluded that the addition of certain patterns can increase film thickness at given loads. A further notable observation, in agreement with experimental measurements, reported by the current authors [9] and Petterson and Jacobson [20], was that pockets parallel to the direction of sliding result in higher friction and lower film thickness.…”

Section: Introductionsupporting

confidence: 92%

“…The experimental rig, described in detail in [9], uses a low-capacity isometric load cell to measure the friction force between a flat fused silica plate, representing the cylinder liner, and a 2-mm-wide convex AISI52100 steel pad, representing the piston ring. The 10-mm-long steel pad is curved in the direction of sliding to ensure a convergent-divergent bearing geometry.…”

Section: Methodsmentioning

confidence: 99%

“…Over the last decade, researchers at Imperial College compared the performance of a wide range of texture geometries, under various operating scenarios, in both experimental and theoretical studies [5][6][7][8][9][10]. Recently, the group's experiments showed that, under reciprocating piston-liner type conditions, beneficial or detrimental effects of surface texture could be achieved depending on which lubrication regime the contact operated under [9].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the group's experiments showed that, under reciprocating piston-liner type conditions, beneficial or detrimental effects of surface texture could be achieved depending on which lubrication regime the contact operated under [9]. Specifically, it was concluded that surface texture can reduce friction in low film thickness contacts, whereas it increased friction in the full-film lubrication regime.…”

Section: Introductionmentioning

confidence: 99%

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The Transient Friction Response of a Laser-Textured, Reciprocating Contact to the Entrainment of Individual Pockets

et al. 2016

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To shed light on the mechanisms with which surface texture improves the tribological performance of piston-liner contacts, we have measured the transient friction response as individual pockets pass through a reciprocating sliding contact. Tests were performed at different sliding speeds and results compared to those from a non-textured, reference specimen under different lubrication regimes. At low speed when the contact is in the boundary regime, friction force falls abruptly as each pocket leaves the contact zone, before gradually returning to an approximately steady-state value. This suggests that each pocket acts to temporarily increase the film thickness, which then decays to its non-textured value as oil is squeezed out. At higher speeds, friction is seen to reduce in a stepwise fashion, since the period between pockets being entrained is less than the time taken for the film to decay. In addition, friction results obtained when the contact is operating in the middle of the mixed regime point to a temporary film thickness collapse as the pocket enters the contact, and this agrees with recent modelling predictions. At higher speeds, the compound effect of successive pockets is to shift the contact to the right on Stribeck curve. These results imply that each pocket gives rise to an increase in film thickness that is both short-lived and small in magnitude (we estimate a few tens of nm). However, the resulting effect on friction can be significant (up to 82 % in this study) for two reasons: (1) provided the pocket frequency is sufficiently high, each successive pocket entrainment builds the film up without there being time for it to reduce back to its steady-state value; (2) when the contact is in the mixed regime, the Stribeck curve is at its steepest and friction is therefore most sensitive to film thickness changes. This has important practical implications in that pocket spacing on piston liners should be varied as a function of reciprocating sliding speed.

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Section: Introductionsupporting

confidence: 92%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Transient Friction Response of a Laser-Textured, Reciprocating Contact to the Entrainment of Individual Pockets

et al. 2016

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“…Dellis and Arcoumanis [27] have studied the different bubble shapes formed in the lubricant film of a piston ring assembly also using photographic methods. More recently, Vladescu et al [28] have used a laser-induced fluorescence to qualitatively visualise cavitation phenomena in surface-textured sliding bearings.…”

mentioning

confidence: 99%

Cavitation Bubble Measurement in Tribological Contacts Using Digital Holographic Microscopy

et al. 2015

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The use of advanced measurement techniques such as the digital holography method described in this paper improves the understanding of the cavitation phenomenon in tribological contacts such as the sliding contact of the piston ring-cylinder liner conjunction. The paper describes the use of digital holography measurement technique to measure cavitation bubble formation and thickness. The position of observed lubricant film rupture preceding the cavitation region is compared with some commonly predicted boundary often used with Reynolds equation. The experimental results indicate that the Reynolds and Elrod boundary conditions are the most suitable for the investigated sliding contact conditions.

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Advanced Materials for Laser Surface Cladding: Processing, Manufacturing, Challenges and Future Prospects

Agboola

Popoola

Sadiku

et al. 2019

Photoenergy and Thin Film Materials

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The effects of surface texture in reciprocating contacts – An experimental study

Abstract: The effect of surface texture on friction has been investigated experimentally for a convergentdivergent bearing, operating under

Cited by 159 publications

References 30 publications

The Transient Friction Response of a Laser-Textured, Reciprocating Contact to the Entrainment of Individual Pockets

The Transient Friction Response of a Laser-Textured, Reciprocating Contact to the Entrainment of Individual Pockets

Cavitation Bubble Measurement in Tribological Contacts Using Digital Holographic Microscopy

Advanced Materials for Laser Surface Cladding: Processing, Manufacturing, Challenges and Future Prospects

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