Axisymmetric squeezing of a Phan‐Thien and Tanner lubricant film under imposed constant load in the presence of a poroelastic medium

Yousfi, Mahdia; Bou‐Saïd, Benyebka; Tichy, John

doi:10.1002/ls.1297

Cited by 6 publications

(4 citation statements)

References 29 publications

(72 reference statements)

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“…The self-lubricating performance of the porous material attracts many researchers in the world. Most studies have focused on exploring the effects of the friction boundary, [8,9] pore parameters, [10] lubricant properties, [11] and external field excitation [12,13] on the lubrication performance. Dowson [14] took the pressure in the porous surface as a lubrication boundary and substituted it into the lubrication model to further investigate the whole lubricant flow in the porous friction system.…”

Section: Introductionmentioning

confidence: 99%

“…From the perspective of the classical elastohydrodynamic lubrication theory, researchers [22][23][24] used a simplified thin linear elastic layer model to calculate the deformation. Bujurke [25] and yousfi [26] also established the porous elastic lubrication model by introducing the elastic coefficient into the seepage equation and coupling it with the fluid lubrication theory. To sum up, although the related researchers have noticed the remarkable influence of the deformation on the lubrication quality, the exudation characteristics of lubricant in the pores on the deformed porous surface are not involved.…”

Section: Introductionmentioning

confidence: 99%

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Percolation and Supply Behavior of Lubricant on Porous Self‐Lubricating Material

et al. 2023

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This article aims to investigate the percolation and supply behavior of lubricant on the porous self-lubricating material. The numerical model is established to describe the infiltration-exudation response in the deformed porous material. It is found that the lubricant stored in the pores is forced to flow when the loaded porous matrix deforms. The flow drives the seepage stratification in the porous body and forms an interlayer flow zone. The fluid pressure gradient in the normal direction is the internal factor of the seepage stratification. The interlayer flow zone first appears in the middle of the vertical direction of the porous matrix. With the increase of loading time, the interlayer flow zone gradually moves from the middle to the bottom of the porous matrix, which means that the quantity of the lubricant stored in the porous surface decreases. In the whole process of the seepage response, the lubricant flows out from the inlet and continuously supplies lubricant to the contact area. Delaying the downward movement of the interlayer flow zone can ensure the continuous exudation of the lubricant, which is beneficial to maintain excellent lubrication characteristics.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Percolation and Supply Behavior of Lubricant on Porous Self‐Lubricating Material

et al. 2023

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“…So, the mechanical nature of granular flow lubrication is different compared with typical liquid lubrication (Higgs and Tichy, 2008). Granular flow lubricate is more suitable for the high temperatures, heavy loads, low speeds or harsh environments, in which the lubricating oil film is not formed (Yousfi, et al , 2015; Wang, et al , 2021). Force chain is the exclusive mechanical structure of granular flow systems which has an important effect on the particles flow pattern, interfacial loading and lubrication properties (Walker et al , 2016; Lai et al , 2023; Wang et al , 2022).…”

Section: Introductionmentioning

confidence: 99%

Effect of the sliding-rolling ratio on the force chain properties of granular flow lubrication interfaces

Cheng

2023

ILT

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Purpose To further understand the granular flow lubrication mechanism in metal contact pairs, the effect of sliding-rolling ratio on the force chain properties was investigated. Design/methodology/approach The parallel inter-plate model of the granular flow lubrication was established with discrete element method. Then, the correlation law between sliding-rolling ratio and force chain evolution properties was calculated and analyzed with PFC2D software platform. Findings Numerical calculation results show that the dynamic fluctuation property of force chain is existed, and the shock frequency of it is increased with the increase of sliding-rolling ratio. The same evolution law is also occurred for the bearing rate of strong force chain in the initial expansion and final compression phases, and the opposite phenomena is obtained for the overall expansion phase. Moreover, the directivity of strong force chain is changed by the sliding-rolling ratio. With the increase of sliding-rolling ratio, the directivity of strong force chain is first tended to y-axis, and then inclined to the x-axis in the whole phases. The basic reason is that a clamping up and downward movement impact for the neighbor particles are the essence of the above phenomenon. Originality/value The main contribution of this work is to lay a theory foundation of interfacial lubrication mechanism with granular flow. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-05-2023-0133/

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“…The load carrying capacity, film thickness, and squeeze time are predicted for hydrogel systems with varying permeability and elastic modulus [139][140][141] . I will use this modelling approach in combination with the well-defined model for the mechanics of bacterial cellulose systems to 18.…”

Section: Poly(nisoproylacrylamide)mentioning

confidence: 99%

Bio-tribology of plant cell walls: measuring the interactive forces between cell wall components

Dolan¹

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Plants have naturally evolved complex cell wall structures to give mechanical and friction properties that facilitate plant growth and development. A biomimetic approach is employed to gain insight into how plants are able to lubricate moving surfaces at multiple length scales. The outcomes of this study advance the fundamental scientific understanding of plant cell wall biology.New insights provided here may have significant implications for optimising the value of plant material as a food source, biofuel precursor, and as a model for functional biomaterial design, particularly for medical applications. A review of the plant cell wall structure, mechanics, and extension processes is used to identify the forces and tribological contacts that are relevant for plant growth. Plant cell walls are essentially hydrogel composites of cellulose fibres within a matrix of biopolymers (e.g. hemicelluloses, pectin) and water. Plant tissue is comprised of a cluster of plant cells where adjacent cell walls are mediated by a pectin rich middle lamella layer. Plant growth is initiated by expansins which are proteins that disrupt cellulose fibre contact points, leading to the extension of the cell wall matrix. As cells expand within the tissue structure, a sliding contact forms between adjacent walls that are extending at different rates. The two critical length scales that are considered here to influence plant growth are the contact between cellulose nano-fibres in the cell wall matrix, and the sliding interface between adjacent cell walls.A large component of this thesis is the development of techniques to mimic the two tribological contacts; that is, fibre-fibre and cell-cell interactions. The sliding interface between two surfaces is achieved using a rotational rheometer, which also allows in situ material characterisation of the surfaces with pre-compression, relaxation, and oscillatory shear mechanical testing steps. The interactive forces between nano-fibres are measured directly using an Atomic Force Microscope (AFM) tip to laterally pull fibres out of a network. Bacterial cellulose networks are used as a model system that is compatible with the developed techniques. Bacterial cellulose is a good model because of the structural similarity to plant cellulose, and its ability to grow as a self-assembled random fibre network with the shape and dimensions controlled by the vessel within which it is grown. The lubricating role of individual cell wall components at the two tribological contacts is examined; including arabinoxylan (AX), xyloglucan (XG), pectin, and expansins. This is achieved ii by growing composite bacterial cellulose networks with AX and XG, and by adding pectin or expansin solutions to the liquid medium surrounding the pre-formed cellulose networks during testing.The unique aspect of this mechanical study is that the experimental results are analysed using computation modelling. Appropriate models are used to simulate the behaviour of fibrous assemblies at multiple length scales, and under condition...

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Axisymmetric squeezing of a Phan‐Thien and Tanner lubricant film under imposed constant load in the presence of a poroelastic medium

Cited by 6 publications

References 29 publications

Percolation and Supply Behavior of Lubricant on Porous Self‐Lubricating Material

Percolation and Supply Behavior of Lubricant on Porous Self‐Lubricating Material

Effect of the sliding-rolling ratio on the force chain properties of granular flow lubrication interfaces

Bio-tribology of plant cell walls: measuring the interactive forces between cell wall components

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