The Solid-Like State of a Confined Liquid Lubricant: Deformation and Time Effects

Reiter, Günter; Demirel, A. Levent; Peanasky, John; Cai, Lenore; Granick, Steve

doi:10.1007/978-94-015-8705-1_7

Cited by 7 publications

(12 citation statements)

References 25 publications

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“…The dependence of the order parameter on elastic strain in the lubricant layer, obtained using the above-mentioned thermodynamic approach, agrees with the similar data obtained from computational studies [ 14 – 16 ]. Moreover, strain–stress curves obtained in [ 10 ] are confirmed by experimental data [ 21 ].…”

Section: Introductionsupporting

confidence: 65%

Stick–slip boundary friction mode as a second-order phase transition with an inhomogeneous distribution of elastic stress in the contact area

Lyashenko

Borysiuk

Popov

2017

Beilstein J. Nanotechnol.

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This article presents an investigation of the dynamical contact between two atomically flat surfaces separated by an ultrathin lubricant film. Using a thermodynamic approach we describe the second-order phase transition between two structural states of the lubricant which leads to the stick–slip mode of boundary friction. An analytical description and numerical simulation with radial distributions of the order parameter, stress and strain were performed to investigate the spatial inhomogeneity. It is shown that in the case when the driving device is connected to the upper part of the friction block through an elastic spring, the frequency of the melting/solidification phase transitions increases with time.

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Section: Introductionsupporting

confidence: 65%

Stick–slip boundary friction mode as a second-order phase transition with an inhomogeneous distribution of elastic stress in the contact area

Lyashenko

Borysiuk

Popov

2017

Beilstein J. Nanotechnol.

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“…It is shown [15] that the plastic flow of lubricant layer is realized at presence of elastic stress. The action of shear stress results to reducing of shear modulus of lubricating material [16]. Consequently, the total friction force decreases with increasing velocity at the contact V because the latter leads to the growth of the shear stress according to the Maxwell stressstrain ε relationship: ∂σ/∂t = −σ/τ σ + G∂ε/∂t.…”

Section: Basic Equationsmentioning

confidence: 99%

Hysteresis phenomena at ultrathin lubricant film melting in the case of first-order phase transition

Хоменко

Lyashenko

2007

Physics Letters A

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Within the framework of Lorentz model for description of viscoelastic medium the influence of deformational defect of the shear modulus is studied on melting of ultrathin lubricant film confined between the atomically flat solid surfaces. The possibility of jump-like and continuous melting is shown. Three modes of lubricant behavior are found, which correspond to the zero shear stress, the Hooke section of loading diagram, and the domain of plastic flow. Transition between these modes can take place according to mechanisms of first-order and second-order phase transformations. Hysteresis of dependencies of stationary stresses on strain and friction surfaces temperature is described. Phase kinetics of the system is investigated. It is shown that ratio of the relaxation times for the studied quantities influences qualitatively on the character of the stationary mode setting.

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“…The ε(σ) dependence is found from condition (12), where T (σ) is given by expression (21), and it has the form described in section 3. Similarly, we obtain the Landau-Khalatnikov equation (13) with synergetic potential (14), in which T (σ) is defined by the relationship (21). In this case the critical temperature coincides with its stationary value T 0 , as at use of Vogel-Fulcher formula.…”

Section: Power Dependencementioning

confidence: 90%

“…It is shown [20] that the plastic flow of lubricant layer is realized at the presence of elastic stress. The action of shear stress causes the reduction of shear modulus of lubricating material [21]. Consequently, the friction force decreases with the velocity increase at the contact V = l∂ε/∂t because the latter leads to the growth of the shear stress σ according to the Maxwell stress -strain ε relationship: ∂σ/∂t= −σ/τ σ +G∂ε/∂t.…”

Section: Basic Equationsmentioning

confidence: 99%

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Temperature dependence effect of viscosity on ultrathin lubricant film melting

Khomenko¹,

Lyashenko²

2006

Condens. Matter Phys.

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We study the melting of an ultrathin lubricant film under friction between atomically flat surfaces at temperature dependencies of viscosity described by Vogel-Fulcher relationship and by power expression, which are observed experimentally. It is shown that the critical temperature exists in both cases the exceeding of which leads to the melting of lubricant and, as a result, the sliding mode of friction sets in. The values of characteristic parameters of lubricant are defined, which are needed for friction reduction. In the systems, where the Vogel-Fulcher dependence is fulfilled, it is possible to choose the parameters at which the melting of lubricant takes place even at zero temperature of friction surfaces. The deformational defect of the shear modulus is taken into account in describing the lubricant melting according to the mechanism of the first-order transition.

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The Solid-Like State of a Confined Liquid Lubricant: Deformation and Time Effects

Cited by 7 publications

References 25 publications

Stick–slip boundary friction mode as a second-order phase transition with an inhomogeneous distribution of elastic stress in the contact area

Stick–slip boundary friction mode as a second-order phase transition with an inhomogeneous distribution of elastic stress in the contact area

Hysteresis phenomena at ultrathin lubricant film melting in the case of first-order phase transition

Temperature dependence effect of viscosity on ultrathin lubricant film melting

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