Non–Amontons-Coulomb local friction law of randomly rough contact interfaces with rubber

Nguyen, Danh Toan; Wandersman, Élie; Prevost, Alexis; Chenadec, Yohan Le; Frétigny, Christian; Chateauminois, A.

doi:10.1209/0295-5075/104/64001

Cited by 7 publications

(2 citation statements)

References 27 publications

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“…Characterizing the tribological behavior of soft materials, such as a hydrated SCL or rubbers, by a CoF, can be useful to a first approximation. However, the linear dependence between frictional and normal forces that is assumed when calculating a CoF is frequently not observed in hard-soft and soft-soft contacts [22][23][24]. The mechanical origin of the linearity between frictional and normal forces has been suggested to arise from the asperity-asperity contacts that define the real area of contact between two hard surfaces.…”

Section: Introductionmentioning

confidence: 99%

Tribological Classification of Contact Lenses: From Coefficient of Friction to Sliding Work

et al. 2016

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The coefficient of friction (CoF) has been reported to correlate with clinical comfort of soft contact lenses (SCL). However, a classification in terms of a CoF is not always applicable to soft materials, such as hydrogels, due to the frequently observed nonlinearity between the lateral and the normal forces. An alternative methodology is presented to quantify the tribological characteristics of soft materials under boundary lubrication in terms of average work. Average work was derived from knowledge of the area of contact, the interfacial shear stress, and sliding distance. To illustrate the work concept, three commercially available SCL (n = 10) and rabbit corneas (n = 10) were characterized with regard to lateral force against a biomimetic mucin-coated glass disk in a tear-like fluid, by means of microtribometry. The contact area between the glass disk and the SCL was measured in situ and fitted to an elastic-foundation model of the material. On the cornea, the contact area was observed via the expulsion of a fluorescent marker from the contact region. All SCL materials had significantly (p \ 0.05) different values for average work. Furthermore, the interfacial shear stress on the cornea was found to be at least an order of magnitude lower than on any of the SCL. Average work represents a single figure of merit for the lubricious properties of soft materials, such as SCL, that do not show a linear relationship between lateral and normal forces.

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Section: Introductionmentioning

confidence: 99%

Tribological Classification of Contact Lenses: From Coefficient of Friction to Sliding Work

et al. 2016

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“…As an example, one can cite the local friction of smooth rubbers surfaces with statistically rough rigid bodies. At the scale of the macroscopic contact, the finite sizes of the contacting bodies induce in-plane surface strains which can easily exceed 0.2 can under the action of a frictional stress [1,2]. At the microscopic scale, this implies that single micro-asperity contacts occur locally on a pre-stretched rubber surface.…”

Section: Introductionmentioning

confidence: 99%

Contact of a spherical probe with a stretched rubber substrate

Frétigny

Chateauminois

2017

Phys. Rev. E

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We report on a theoretical and experimental investigation of the normal contact of stretched neoHookean substrates with rigid spherical probes. Starting from a published formulation of surface Green's function for incremental displacements on a pre-stretched, neo-Hookean, substrate (L.H. Lee J. Mech. Phys. Sol. 56 (2008) 2957-2971), a model is derived for both adhesive and non-adhesive contacts. The shape of the elliptical contact area together with the contact load and the contact stiffness are predicted as a function of the in-plane stretch ratios λx and λy of the substrate. The validity of this model is assessed by contact experiments carried out using an uniaxally stretched silicone rubber. for stretch ratio below about 1.25, a good agreement is observed between theory and experiments. Above this threshold, some deviations from the theoretical prediction are induced as a result of the departure of the mechanical response of the silicone rubber from the neo-Hokeean description embedded in the model.

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Silicone Rubber Adhesion and Sliding Friction

Persson

2016

Tribol Lett

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Non–Amontons-Coulomb local friction law of randomly rough contact interfaces with rubber

Cited by 7 publications

References 27 publications

Tribological Classification of Contact Lenses: From Coefficient of Friction to Sliding Work

Tribological Classification of Contact Lenses: From Coefficient of Friction to Sliding Work

Contact of a spherical probe with a stretched rubber substrate

Silicone Rubber Adhesion and Sliding Friction

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