Model for the static friction coefficient in a full stick elastic-plastic coated spherical contact

Zhou, C.; Etsion, I.

doi:10.1007/s40544-018-0251-5

Cited by 17 publications

(19 citation statements)

References 37 publications

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“…[31]), that with increasing t/R, μ first decreases and then increases having a minimum μ m at (t/R) m . It was also noticed in [31] that as t/R approaches zero the static friction coefficient does not approach μ su , which differs from the observation in hard coatings [30]. The effect of normal loading on μ in the single case studied in Ref.…”

Section: Theoretical Backgroundmentioning

confidence: 72%

“…Based on [24] for homogeneous spherical contact, Chen and Etsion [30] studied the static friction coefficient of a spherical contact with hard coating. The model included a coating of thickness t on a spherical substrate of radius R, with Y co ∕Y su > 1 for hard coating case, where the subscripts "co" and "su" represent the coating and substrate, respectively.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…Based on [30] for hard coating, Chen [31] studied the static friction coefficient of spherical contact including soft coating (Y co /Y su < 1) for a single combination of substrate and soft coating materials. It was found, see Fig.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…Chen and Etsion [30] extended the model in [24] to include hard coatings. They found that under a fixed normal load the static friction coefficient first increases then decreases with the increasing coating thickness.…”

Section: Introductionmentioning

confidence: 99%

“…They found that under a fixed normal load the static friction coefficient first increases then decreases with the increasing coating thickness. It was speculated in [30] that a sphere with soft coating will exhibit a mirror image behavior of a hard coating. This speculation was verified recently in [31] for a single combination of substrate and soft coating materials.…”

Section: Introductionmentioning

confidence: 99%

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Model for the static friction coefficient of spherical contact with a soft metal coating

2020

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An elastic-plastic spherical contact with soft metallic coating under combined normal and tangential loading is studied by finite element analysis. Full-stick contact condition is assumed and sliding inception is related to vanishing tangential stiffness of the contact junction. Previously observed, both experimentally and theoretically, effects of increasing coating thickness on static friction coefficient that were published in the literature are thoroughly explained here, to the authors' best knowledge, for the first time. These effects include initial sharp drop of friction as soon as a thinnest coating film is applied, followed by a transitional behavior from decrease to increase of friction when the coating thickness is continuously increased. An intensive parametric study is performed and the effects of substrate and coating material properties on the static friction coefficient are revealed and thoroughly explained. An empirical expression for the static friction coefficient is derived along with the values for optimum coating thickness that provides the minimum friction coefficient.

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Section: Theoretical Backgroundmentioning

confidence: 72%

Section: Theoretical Backgroundmentioning

confidence: 99%

Section: Theoretical Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Model for the static friction coefficient of spherical contact with a soft metal coating

2020

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Multiphysical contact of functionally graded magneto-electro-elastic material with imperfect bonding interface

Sui,

Zhang,

Zhao

et al. 2023

Friction

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Three-dimensional (3D) frictional contact model of functionally graded magneto-electro-elastic (FGMEE) material with a conducting spherical punch under electromagnetic fields is presented. Two types of imperfect bonding interface of layers, dislocation-like interface and force-like interface, are considered. Frequency response functions (FRFs) for multilayered MEE material with imperfect interface subjected to unit mechanical, electric, and magnetic loads are derived. The FRFs are used with the semi-analytical method (SAM) to solve present multiphysical contact problem. The present model is verified by comparing with literatures and the finite element method (FEM) and used to study the contact problem of FGMEE film imperfectly bonded on homogenous MEE half-space under electromagnetic fields. Parametric studies are conducted to reveal the effects of imperfect interfaces and also film properties including gradient index and thickness.

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Modeling static friction behavior of elastic–plastic spherical adhesive microcontact in full-stick condition

Xiang,

Goltsberg,

Etsion

2024

Friction

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The static friction behavior of an elastic–plastic spherical adhesive microcontact between a rigid flat and a deformable sphere under combined normal and tangential loading is studied by the finite element method (FEM). The contact between the sphere and the rigid flat is assumed to be full-stick, and the sliding inception is related to a loss of tangential stiffness. The intermolecular force between the rigid flat and the sphere is assessed by the Lennard–Jones (LJ) potential, which is applied to the sphere and the rigid flat by a user subroutine. The evolution of the adhesive force with tangential displacement in the full-stick condition is revealed. The results indicate that the increasing effect of adhesive energy on the static friction coefficient gradually diminishes with an increase in the adhesive energy and the external normal load. Finally, based on an extensive parametric study, an empirical dimensionless expression is obtained to predict the static friction coefficient of the spherical adhesive microcontact considering the intermolecular force.

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Model for the static friction coefficient in a full stick elastic-plastic coated spherical contact

Cited by 17 publications

References 37 publications

Model for the static friction coefficient of spherical contact with a soft metal coating

Model for the static friction coefficient of spherical contact with a soft metal coating

Multiphysical contact of functionally graded magneto-electro-elastic material with imperfect bonding interface

Modeling static friction behavior of elastic–plastic spherical adhesive microcontact in full-stick condition

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