Pre-sliding Behaviour of Single Asperity Contact

Yaqoob, M. A.; Winogrodzka, A.; Fischer, Hartmut; Gelinck, E.R.M.; Rooij, M.B. de; Schipper, Dirk J.

doi:10.1007/s11249-012-0096-4

Cited by 10 publications

(14 citation statements)

References 21 publications

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“…The material properties of these materials are presented in Appendix B [12,57]. Due to the very low roughness of the samples (Rq = 8 nm or Rq = 15 nm) a single asperity contact is simulated in the experiments.…”

Section: Methodsmentioning

confidence: 99%

“…However, as can be shown by calculations, the normal load dependency of the contact area by the Hertz theory (Equation 2.4) remains more or less similar [12] when adhesion is also taken into account. The relation between the maximum preliminary displacement δ tmax and applied normal load is shown in Equation 4.2 [12,57]:…”

Section: Pre-sliding Behaviour Of Single Asperity Contactmentioning

confidence: 99%

“…The humidity during the measurement was controlled, because a higher humidity also shows influence on the coefficient of friction [57]. The results presented were obtained by controlling the humidity at the same level of approximately RH = 28 ± 5%.…”

Section: Increasing Normal Load During Slidingmentioning

confidence: 99%

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Pre-sliding behaviour of multi asperity ceramic contacts

Winogrodzka¹

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functioning of high-tech mechatronic systems. The tribological behaviour of sliding contacts in such mechanisms plays an important role in the performance of these systems. The geometrical changes of the surfaces, where geometry is defined as a multi asperity contact, will influence the frictional behaviour. This thesis focuses on the pre-sliding and sliding behaviour of contacts with the aim of determining the parameters which influence the errors in positioning accuracy.The single asperity contact is the first step in understanding the pre-sliding behaviour between two elements. It is from this model that the tangential displacement is calculated, based on an applied normal load and the coefficient of friction. The normal load can be constant, either increasing or decreasing; this will depend on the operating conditions within the application. Adhesion plays an important role in a single asperity contact, whilst for a multi asperity contact adhesion can often be ignored.This thesis introduces the test setup, which consists of a confocal height sensor for surface roughness measurement and a confocal Raman spectroscopy setup for chemical changes in the contact. Using this setup, it is possible to analyse the formation of chemical transfer layers as well as any geometrical changes in the wear track.The single asperity contact model shows good agreement with the experimental work performed for silicon and silica against glass. With respect to high and low SUMMARYvii contact pressures, (< 100 MPa) the Mindlin theory can be used to predict pre-sliding behaviour. However, at very low loads the adhesion starts to significantly affect the results.The pre-sliding behaviour of multi asperity contact, so rough surfaces, can be described on the basis of results obtained from theoretical calculations and experiments. The calculation of the tangential displacement for rough surfaces is presented in this thesis. The main assumption in the model presented is that rough surfaces can be modelled as a set of Hertzian contacts, where each asperity has its own radius and summit height. One asperity with a maximum value of tangential displacement will determine when a multi asperity contact starts sliding. The asperities will have no mutual influence apart from sharing the total tangential and normal load. Calculations for different applied loads, surface roughness and autocorrelation lengths show that roughness plays an important role in the preliminary displacement.In the design of surfaces for positioning accuracy, parameters such as surface roughness, applied normal load and tangential load should be taken into account. In het ontwerp van oppervlakken ten behoeve van positioneringsnauwkeurigheid is het belangrijk dat ten eerste de drift minimaal is en dat daarnaast het contact zo stabiel mogelijk zal opereren, ook bij eventuele veranderingen. Getextureerde oppervlakken, bestaande uit regelmatige structuren, zijn beter in staat om drift te minimaliseren dan random ruwe oppervlakken. Berekeningen laten zien dat een oppervlakte sam...

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Section: Methodsmentioning

confidence: 99%

Section: Pre-sliding Behaviour Of Single Asperity Contactmentioning

confidence: 99%

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Pre-sliding behaviour of multi asperity ceramic contacts

Winogrodzka¹

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“…For water layers, t h can be estimated from Brunauer, Emmett, and Teller (BET) adsorption model. 27 Because of BET model shows its limit when RH exceed 50%, the data from experimental measurements of literature 44 are used for the corresponding explored RH range in this paper. We first analyze the dependence of capillary force on RH and temperature with consideration of absorbed water layers on surfaces.…”

Section: Nano Lettersmentioning

confidence: 99%

“…The capillary forces were considered in inducing the adhesion between the tip and the substrate. Other forces that may contribute to the tip−substrate adhesion, such as the contact adhesion forces, the short-range repulsive forces, the attractive long-range van der Waals forces, 27 were neglected. The scheme of the simulation model illustrating the dynamic of the tip-cantilever ensemble motion is shown in Figure 1.…”

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confidence: 99%

Experimental and Theoretical Investigations on the Nanoscale Kinetic Friction in Ambient Environmental Conditions

et al. 2015

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The liquid lubrication, thermolubricity and dynamic lubricity due to mechanical oscillations are investigated with an atomic force microscope in ambient environmental conditions with different relative humidity (RH) levels. Experimental results demonstrate that high humidity at low-temperature regime enhances the liquid lubricity while at high-temperature regime it hinders the effect of the thermolubricity due to the formation of liquid bridges. Friction response to the dynamic lubricity in both high- and low-temperature regimes keeps the same trends, namely the friction force decreases with increasing the amplitude of the applied vibration on the tip regardless of the RH levels. An interesting finding is that for the dynamic lubricity at high temperature, high-humidity condition leads to the friction forces higher than that at low-humidity condition while at low temperature the opposite trend is observed. An extended two-dimensional dynamic model accounting for the RH is proposed to interpret the frictional mechanism in ambient conditions.

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Micromechanical‐based experimental and analytical studies on rate effects and stick‐slip instability of smooth quartz surfaces in the presence of plastic and non‐plastic gouges

Kasyap

Senetakis

2020

Num Anal Meth Geomechanics

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We examined with micromechanical-based experiments the influence of shearing rate on the tangential contact behavior of smooth (very low surface roughness) flat quartz surfaces with montmorillonite and crushed aggregates as gouges. On decreasing the shearing rate by one order of magnitude, significant changes in the stick-slip instability were observed; increase in force-drop, recurrence interval and slip velocity. The initial tangential stiffness increased on decreasing the shearing rate. The type of gouge particles also influenced the behavior of the interfaces; for example, higher friction and stable sliding were observed for angular particles (non-plastic gouge) compared to flaky particles (plastic gouge). The partition of the tangential force-displacement relationship based on the shape of the curve was also dependent on the shearing rate. On a qualitative standpoint, the results presented in this micromechanicalbased study were in agreement with macro-scale test results published in the literature, although different scale tests were also performed in the present work, from grain-level to direct shear test size. The changes in the behavior of stick and slip components of the tangential force and the contact area with shearing rate were analytically studied, and the corresponding variations in the normal load-displacement relationship were also discussed. This experimental micromechanical-based study with additional analytical support, provides a preliminary understanding of the frictional behavior of different gouges under shearing rates of one folder difference and also provides insights into the stickslip instability behavior at a microscopic (grain-scale) standpoint.

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Pre-sliding Behaviour of Single Asperity Contact

Cited by 10 publications

References 21 publications

Pre-sliding behaviour of multi asperity ceramic contacts

Pre-sliding behaviour of multi asperity ceramic contacts

Experimental and Theoretical Investigations on the Nanoscale Kinetic Friction in Ambient Environmental Conditions

Micromechanical‐based experimental and analytical studies on rate effects and stick‐slip instability of smooth quartz surfaces in the presence of plastic and non‐plastic gouges

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