Characterization of interfacial shear strength and its effect on ploughing behaviour in single-asperity sliding

Mishra, Tanmaya; Rooij, M.B. de; Shisode, Meghshyam; Hazrati, Javad; Schipper, Dirk J.

doi:10.1016/j.wear.2019.203042

Cited by 14 publications

(26 citation statements)

References 27 publications

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“…Metallic oxides usually exhibit a higher interfacial shear strength. [ 47 ] Bowden and Tabor pointed out that while moving two bodies tangentially, the friction force is a function of the real contact area and the junction's shear strength. [ 46,48 ] Depending on the hardness of the body, the contact area and shear strength deviate: the contact of a hard body sliding against a soft body shows a large contact area and low shear strength (copper vs sapphire) while the contact of two hard bodies exhibits a small contact area but large shear strengths (copper oxides vs sapphire).…”

Section: Discussionmentioning

confidence: 99%

“…reported a change in wear behavior from plowing to wedging (deformed substrate material stacked in front of the sliding asperity and possibly material transfer, Figure 4d,g) with increased shear strength. [ 47,49 ] Hence, oxides with higher shear strength are expected to show less or no plowing. In addition, a soft interfacial medium or film between the two contacting bodies may lead to a small contact area and small shear strengths within the film, ultimately resulting in a low coefficient of friction.…”

Section: Discussionmentioning

confidence: 99%

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How Tribo‐Oxidation Alters the Tribological Properties of Copper and Its Oxides

Lehmann

Schwaiger

Rinke

et al. 2020

Adv Materials Inter

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Tribochemical reactions in many applications determine the performance and lifetime of individual parts or entire engineering systems. The underlying processes are however not yet fully understood. Here, the tribological properties of copper and its oxides are investigated under mild tribological loading and for dry sliding. The oxides represent the late stages of a copper–sapphire tribo‐contact, once the whole copper surface is covered with an oxide. For this purpose, high‐purity copper, thermally‐oxidized and sintered Cu2O and CuO samples are tribologically loaded and eventually formed wear particles analyzed. The tribological behavior of the oxides is found to be beneficial for a reduction of the coefficient of friction (COF), mainly due to an increase in hardness. The results reveal tribochemical reactions when copper oxides are present, irrespective of whether they form during sliding or are existent from the beginning. Most strikingly, a reduction of copper oxide to metallic copper is observed in X‐ray photoelectron spectroscopy measurements. A more accurate understanding of tribo‐oxidation will allow for manufacturing well‐defined surfaces with enhanced tribological properties. This paves the way for extending the lifetime of contacts evincing tribo‐oxidation.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

How Tribo‐Oxidation Alters the Tribological Properties of Copper and Its Oxides

Lehmann

Schwaiger

Rinke

et al. 2020

Adv Materials Inter

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“…1) The tool is flat and rigid as the hardness of sapphire is much higher than the sample materials; 2) the coefficient of friction of 0.08 is used between the rough surface and the tool. The coefficient of friction between a mirror finished sapphire surface and GI sample is determined by a linear friction tester [22];…”

Section: Assumptionsmentioning

confidence: 99%

Evolution of real area of contact due to combined normal load and sub-surface straining in sheet metal

et al. 2020

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Understanding asperity flattening is vital for a reliable macro-scale modeling of friction and wear. In sheet metal forming processes, sheet surface asperities are deformed due to contact forces between the tools and the workpiece. In addition, as the sheet metal is strained while retaining the normal load, the asperity deformation increases significantly. Deformation of the asperities determines the real area of contact which influences the friction and wear at the tool-sheet metal contact. The real area of contact between two contacting rough surfaces depends on type of loading, material behavior, and topography of the contacting surfaces. In this study, an experimental setup is developed to investigate the effect of a combined normal load and sub-surface strain on real area of contact. Uncoated and zinc coated steel sheets (GI) with different coating thicknesses, surface topographies, and substrate materials are used in the experimental study. Finite element (FE) analyses are performed on measured surface profiles to further analyze the behavior observed in the experiments and to understand the effect of surface topography, and coating thickness on the evolution of the real area of contact. Finally, an analytical model is presented to determine the real area contact under combined normal load and sub-surface strain. The results show that accounting for combined normal load and sub-surface straining effects is necessary for accurate predictions of the real area of contact.

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“…The experimental set-ups consist of a line contact shear test set-up, a scratch test set-up, an indentation set up and different imaging/microscopy set up all of which will be described in this section. Further details on the experimental characterization procedure and results can be referred to [121] and [107] (appended paper D and E).…”

Section: Methodsmentioning

confidence: 99%

“…The first section deals with the individual hardness and elastic modulus of the coating and the substrate and effective hardness and Young's modulus of the coated system. Further details about interfacial shear strength characterization is explained in paper D [121]. The second section deals with the interfacial shear strength of the lubricant boundary layers and oxide layers formed at the interface of the zinc coated and uncoated steel sheets and the pins at various contact pressure and sliding velocities.…”

Section: Experimental Characterizationmentioning

confidence: 99%

Modelling ploughing by an elliptical asperity through a zinc coated steel sheet : with application to modelling friction in deep-drawing

Mishra¹

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As I am at the cusp of a memorable journey, I reminisce the enriching pursuit of my research and I acknowledge the invaluable contributions of so many people to the successful completion of my PhD.To start with, I would like to thank my supervisor Prof. Matthijn de Rooij to have seen the potential and shown the confidence and patience in me as a PhD candidate. I would also like to express my gratitude for his constant guidance, sincere supervision, cordial mentoring and friendly nature. I have always ended up being invigorated and motivated after all our weekly meetings and impromptu short discussions. I would like to thank my promoter Prof. Dirk Schipper for his critical observations and indispensable suggestions on my research. I would also like to thank Dr. Javad Hazrati for our discussions, his guidance and corrections on my research.I would like to express my heartfelt gratitude to ing. Erik de Vries for his immense help in setting up experiments and quick fixes to the issues in the laboratory. My gratefulness to ing. Nick Helthuis, Ms. Belinda Bruinink and ing. Walter Lette for their timely help in my research.

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Characterization of interfacial shear strength and its effect on ploughing behaviour in single-asperity sliding

Cited by 14 publications

References 27 publications

How Tribo‐Oxidation Alters the Tribological Properties of Copper and Its Oxides

How Tribo‐Oxidation Alters the Tribological Properties of Copper and Its Oxides

Evolution of real area of contact due to combined normal load and sub-surface straining in sheet metal

Modelling ploughing by an elliptical asperity through a zinc coated steel sheet : with application to modelling friction in deep-drawing

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