Tribological properties of nanostripe surface structures—a design concept for improving tribological properties

Miyake, Koji; Nakano, Miki; Korenaga, Atsushi; Mano, Hiroki; Ando, Yasuhisa

doi:10.1088/0022-3727/43/46/465302

Cited by 17 publications

(8 citation statements)

References 26 publications

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“…Confocal microscopy can be used to analyse the micro geometry of surfaces in detail [33]. Miyake et al [34] used the confocal laser microscopy to determine wear by observing profiles of microgrooves in Al-Al 2 O 3 composite surface. The advantages of using confocal microscopy are the high spatial resolution together with high accuracy and the possibility of applying it to different kinds of materials.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

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: Theoretical Backgroundmentioning

confidence: 99%

Pre-sliding behaviour of multi asperity ceramic contacts

Winogrodzka¹

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“…Some of the authors have developed a new method of fabricating surface patterns combining two kinds of materials, including metals or ceramics (Ando et al, 2010;Miyake et al, 2010;Ando and Abe, 2019). These nanostripe structures facilitate the efficient fabrication of nanoscale ridge and groove patterns, which can be arranged at desirable lengths and angles on a surface.…”

Section: Introductionmentioning

confidence: 99%

Determining lubrication properties of hierarchical groove patterns using mesoscale raster-scanning measurements

SHIOJIMA

ANDO

MIYAKE

et al. 2022

JAMDSM

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In this study, we characterized the lubrication properties of two different hierarchical patterns comprising microand nanogrooves. The friction coefficient distribution was measured using a convex lens-the friction coefficients were found to periodically undulate along the scan lines with a period equal to the unit pattern. The variation of friction coefficient was more apparent in the case of the Type L pattern with the low boundary bands. For the Type H pattern with the high boundary bands, the undulation in the friction coefficient became clearer at higher sliding speeds, and concurrently, its average friction coefficient decreased with the higher sliding speed. Numerical calculations revealed that oil films formed more easily on Type H patterns than on Type L ones. When pause durations were included in Type H friction tests, the kinetic friction coefficient decreased when the lens slid parallel to the micro/nanogrooves, whereas it was not affected during orthogonal friction.

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“…Nowadays, lubricants are mainly used for reducing friction forces; however, other technologies are now in demand, because lubricants generally lead to pollution of the environment [3]. In recent years, surface nano- and microstructures have attracted attention to reduce friction force [4,5,6]. Although there are a lot of reports on friction reduction by nano- and microstructures, the most effective textures remain under consideration, as friction is a complex phenomenon that is affected by atomic-level structures [7,8].…”

Section: Introductionmentioning

confidence: 99%

The Friction Properties of Firebrat Scales

et al. 2019

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Friction is an important subject for sustainability due to problems that are associated with energy loss. In recent years, micro- and nanostructured surfaces have attracted much attention to reduce friction; however, suitable structures are still under consideration. Many functional surfaces are present in nature, such as the friction reduction surfaces of snake skins. In this study, we focused on firebrats, Thermobia domestica, which temporary live in narrow spaces, such as piled papers, so their body surface (integument) is frequently in contact with surrounding substrates. We speculate that, in addition to optical, cleaning effects, protection against desiccation and enemies, their body surface may be also adapted to reduce friction. To investigate the functional effects of the firebrat scales, firebrat surfaces were observed using a field-emission scanning electron microscope (FE-SEM) and a colloidal probe atomic force microscope (AFM). Results of surface observations by FE-SEM revealed that adult firebrats are entirely covered with scales, whose surfaces have microgroove structures. Scale groove wavelengths around the firebrat’s head are almost uniform within a scale but they vary between scales. At the level of single scales, AFM friction force measurements revealed that the firebrat scale reduces friction by decreasing the contact area between scales and a colloidal probe. The heterogeneity of the scales’ groove wavelengths suggests that it is difficult to fix the whole body on critical rough surfaces and may result in a “fail-safe” mechanism.

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Tribological properties of nanostripe surface structures—a design concept for improving tribological properties

Cited by 17 publications

References 26 publications

Pre-sliding behaviour of multi asperity ceramic contacts

Pre-sliding behaviour of multi asperity ceramic contacts

Determining lubrication properties of hierarchical groove patterns using mesoscale raster-scanning measurements

The Friction Properties of Firebrat Scales

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