Increased Sliding Friction of a Lubricated Soft Solid Using an Embedded Structure

Moyle, Nichole; Dong, Hao; Wu, Haibin; Khripin, Constantine Y.; Hui, Chung‐Yuen; Jagota, Anand

doi:10.1007/s11249-021-01540-9

Cited by 8 publications

(4 citation statements)

References 43 publications

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“…An approximate power‐law fit to the numerical solution [ 25 ] of the EHL governing equations is also provided as a guide here (dashed line in Figure 2) that is in agreement with our experimental results in the EHL regime, as we have reported previously. [ 26,32 ] It should be noted that for 10 and 100 Pa s silicone oil systems, under low load and high‐velocity conditions ( V > 2 × 10 −3 , Figure 2), the data deviate from the power‐law fit. For lubricants with low viscosity (i.e., water or water‐glycerol mixtures), our system always stays in a boundary lubrication regime under experimental conditions.…”

Section: Resultsmentioning

confidence: 99%

“…[24] Similar to the EHL, factors influencing the sliding friction between two solid surfaces in the ML regime have also been explored. [30][31][32] The lubrication regime transition from EHL to ML regime has attracted lots of attention. According to several lubrication scaling rules, for example, empirical Stribeck curves or EHL scaling with a more solid physical foundation, the transition point is associated with the lowest normalized friction for a given system.…”

Section: Introductionmentioning

confidence: 99%

“…[ 24 ] Similar to the EHL, factors influencing the sliding friction between two solid surfaces in the ML regime have also been explored. [ 30–32 ]…”

Section: Introductionmentioning

confidence: 99%

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The transition from Elasto‐Hydrodynamic to Mixed Regimes in Lubricated Friction of Soft Solid Surfaces

Dong

Moyle

et al. 2023

Advanced Materials

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Lubricated contacts in soft materials are common in various engineering and natural settings, such as tires, haptic applications, contact lenses, and the fabrication of soft electronic devices. Two major regimes are elasto‐hydrodynamic lubrication (EHL), in which solid surfaces are fully separated by a fluid film, and mixed lubrication (ML), in which there is partial solid‐to‐solid contact. The transition between these regimes governs the minimum sliding friction achievable and is thus very important. Generally, the transition from EHL to ML regimes is believed to occur when the thickness of the lubricant layer is comparable with the amplitude of surface roughness. Here, it is reported that in lubricated sliding experiments on smooth, soft, poly(dimethylsiloxane) substrates, the transition can occur when the thickness of the liquid layer is much larger than the height of the asperities. Direct visualization of the “contact” region shows that the transition corresponds to the formation of wave‐like surface wrinkles at the leading contact edge and associated instabilities at the trailing contact edge, which are believed to trigger the transition to the mixed regime. These results change the understanding of what governs the important EHL–ML transition in the lubricated sliding of soft solids.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The transition from Elasto‐Hydrodynamic to Mixed Regimes in Lubricated Friction of Soft Solid Surfaces

Dong

Moyle

et al. 2023

Advanced Materials

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show abstract

“…This comparison gives a shear modulus of 0.65 MPa which is consistent with literature values. 20 The shear modulus is then fixed at this value for all simulations with different overlaps. This means that the friction coefficient m is the only remaining fitting parameter.…”

Section: Finite Element Modelmentioning

confidence: 99%