Evidence of scuffing initiation by adiabatic shear instability

Hershberger, J.; Ajayi, O. O.; Zhang, J.; Yoon, Ho‐Geun; Fenske, G.R.

doi:10.1016/j.wear.2004.10.010

Cited by 56 publications

(22 citation statements)

References 25 publications

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“…Several theories concerning scuffing activation [2] have been suggested in the literature but none of them unequivocally determine the process evolution. The most relevant of them connect the initiation of this process under boundary lubrication (BL) with a critical temperature [11], a debris generation size [12], a kinetic of their accumulation in interface [13], a plastic deformation of asperities [14], formation and destruction of protective oxide films [15], a surface polarity [2], an energetic activation of metallic surfaces [16] and an adiabatic shear instability [17]. Irrespective of above factors the boundary lubrication cannot provide a long-term protection against scuffing as can be schematically illustrated on ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Roughness and wettability of surfaces in boundary lubricated scuffing wear

Wojciechowski

Kubiak

Mathia

2016

Tribology International

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The diversity of multidisciplinary approaches suggests that fundamentals of scuffing require systemic, complex multi-scale and multi-physics analysis of an irreversible process as it is postulated in present study. That is probably one of the reasons of lack of unequivocal model of this irreversible transitional process from stable more or less lubricated wear to scuffing described only by one or few authors in equation(s) form. Therefore, it is useful to characterize the tribological surface properties in frame of systemic approach looking simultaneously for the optimal compromise between rheological, morphological and physicochemical features of contacting surface's layer. Hypothetical role connected to any group of features in the topological approach is elucidated and experimentally confirmed via the wettability, strongly combined with surface roughness and surface free energy. Due to the fact that the free energy is directly related to the surface wettability it can as well affect the scuffing activation process. For scientific and rhetoric reasons some selected results of limited boundary lubrication investigations under double blind trial conditions in case of gear oil with anti-wear (AW) and extreme pressure (EP) additives are elucidated here. The results issued from scuffing tests on AISI 4140 ground steel burnished under different forces in order to generate different surface roughness, residual stresses and surface energy are analysed. It was stated and numerically correlated that the wettability by lubricating medium influences the scuffing resistance. Additionally, the dependence of wettability on selected parameters of roughness and a time to scuffing activation have been stated. On that basis, it is proposed to reinforce concept of "oleophilic" and "oleophobic" properties of metallic surfaces as autonomous invariants determining the activation of catastrophic wear process under boundary lubricated conditions. Keywords: Scuffing; Wettability; Boundary lubrication; Surface roughness. This is an eprint of paper published by Elsevier in Tribology International (2015) kris@kubiak.co.uk http://dx Nomenclature:

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Section: Introductionmentioning

confidence: 99%

Roughness and wettability of surfaces in boundary lubricated scuffing wear

Wojciechowski

Kubiak

Mathia

2016

Tribology International

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“…EHD film collapse also forms the basis of models in which catastrophic starvation results from accumulation of wear debris in the inlet [13]. Recently there has been considerable focus on the behaviour of the rubbing solid sub-surfaces during rubbing and models based on metallic transformation processes initiated by the rapid application of pressure, shear stress and temperature have been developed [14]. It is noteworthy that all the above 4 interpretations of scuffing focus on different stages in the, presumably sequential, film breakdown process.…”

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confidence: 99%

A new scuffing test using contra-rotation

Ingram

Hamer

Spikes

2015

Wear

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“…That is also the reason why the COF is higher when TiN sliding against Ti-6Al-4V. Because two solid surfaces with small misfit sliding against each other often results in strong adhesion and high COF [23,24] The oxides formed at the interface will in turn slightly reduce the COF.…”

Section: Discussionmentioning

confidence: 99%