Friction and Wear

Menezes, Pradeep L.; Nosonovsky, Michael; Kailas, Satish V.; Lovell, Michael R.

doi:10.1007/978-1-4614-1945-7_2

Cited by 31 publications

(29 citation statements)

References 99 publications

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“…It is the science of interacting surfaces in relative motion [115]. When under an external load, two materials are in contact with each other, the asperities of two surfaces come into close contact and during movement, deterioration of the surfaces occurs which is known as wear.…”

Section: Tribological Behavior Of Self-lubricating Nanocompositesmentioning

confidence: 99%

Mechanical and tribological properties of self-lubricating metal matrix nanocomposites reinforced by carbon nanotubes (CNTs) and graphene – A review

Moghadam

Omrani

Menezes

et al. 2015

Composites Part B: Engineering

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793

272

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Section: Tribological Behavior Of Self-lubricating Nanocompositesmentioning

confidence: 99%

Mechanical and tribological properties of self-lubricating metal matrix nanocomposites reinforced by carbon nanotubes (CNTs) and graphene – A review

Moghadam

Omrani

Menezes

et al. 2015

Composites Part B: Engineering

Self Cite

793

272

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“…Differing degrees of separation of the surfaces occur depending on the velocity of the concrete flow, the viscosity of the oil, the temperature and pressure (load) to which the film is subjected, and the surface structure of the materials in relative motion [4]. The minimum friction coefficient is observed in the elastohydrodynamic regime, where the thickness of the lubricating film is typically between 0.5 and 5 lm [23]. The aforementioned results assume that the thickness of the lubricating film is greater than the roughness of the surfaces.…”

Section: Discussionmentioning

confidence: 98%

Laboratory and field performance of biodegradable release agents for hydraulic concrete

et al. 2015

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Raw vegetable oils and their emulsions have been used as biodegradable release agents for concrete. However, there is no scientific explanation linking the chemical composition to their release performance. The present study was divided into two phases. In the first phase, different vegetable oils with varying degrees of refinement were chemically characterized by middle range Fourier transform infrared spectroscopy (Mid-FTIR), and their viscosities were measured. For comparison purposes, two commercial release agents based on mineral oil were used. In the second phase, emulsions containing bleached soybean oil, water and some emulsifiers were prepared. The performance of the oils and emulsions as demolding agents in steel/concrete interfaces was measured by visual rating, image analysis and bond strength. The results indicate that almost all of the vegetable oils showed better performance than that of the two mineral oil-based agents, which is explained by the higher affinity of glycerol esters for metal surfaces and higher intermolecular interactions. The Mid-FTIR espectrum analysis indicates that oils having larger absorption areas under the curve at the methylene group exhibit better performance as release agents. In addition, the Mid-FTIR analysis allowed identification of the main molecular groups and differentiation between oil samples. In the second phase, the water/oil emulsion stabilized with organophilic clay performed the best. In addition to the lubricating effect of the emulsion, the better performance was also due to the saponification reaction between the acylglycerides and the Ca(OH) 2 . The tangential adhesion was reduced to approximately 64 % compared to that of a mold without a release agent.

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“…The scratch hardness S H of single crystal copper is anisotropic and dependent on the crystallographic direction. The S H value is connected to the plastic flow through the scaling relation ~S H  [15,23], resembling the familiar Taylor relation between the dislocation density  and the shear flow stress  in crystals. After passing the grain boundary, the indenter penetrates into an undeformed grain where S H changes according to the dislocation behaviour controlled by the crystallographic orientation of the grain.…”

Section: Ss Vw mentioning

confidence: 99%

“…with the twofold increase in S V . It is important to notice here that the scratching velocity exerts opposite effects on adhesive friction and AE: interfacial friction reduces [15,16] while AE increases with the increasing velocity. The observed behaviour corroborates the assumption that the effect of plastic deformation overrides the possible effect of interfacial friction.…”

mentioning

confidence: 99%

Probing elementary dislocation mechanisms of local plastic deformation by the advanced acoustic emission technique

et al. 2018

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To gain a deeper insight into fundamental processes of localised plastic deformation, we propose a new strategy for micro-mechanical testing combining the micro-scale scratching and analysis of low amplitude acoustic emissions (AE) accompanying dynamic dislocation processes in solids. The analysis of the AE spectral density reveals its strong dependence on crystallographic orientations of the grains along the indenter path, thus reflecting the finest features of the local dislocation activity. Adding a temporal dimension with a sub-microsecond resolution, the proposed methodology substantially enhances the existing capacity of micromechanical testing and can be used in a wide range of testing schemes.

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Friction and Wear

Cited by 31 publications

References 99 publications

Mechanical and tribological properties of self-lubricating metal matrix nanocomposites reinforced by carbon nanotubes (CNTs) and graphene – A review

Mechanical and tribological properties of self-lubricating metal matrix nanocomposites reinforced by carbon nanotubes (CNTs) and graphene – A review

Laboratory and field performance of biodegradable release agents for hydraulic concrete

Probing elementary dislocation mechanisms of local plastic deformation by the advanced acoustic emission technique

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