A comparison of stick and slip contact conditions for a coated sphere compressed by a rigid flat

Ronen, Shai; Goltsberg, Roman; Etsion, I.

doi:10.1007/s40544-017-0178-2

Cited by 16 publications

(13 citation statements)

References 33 publications

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“…By fixing the elastic modulus and the radius of the substrate, i.e., E su = 200 GPa and R = 10 mm, the model can be determined by four dimensionless parameters: E su /Y su , E co /E su , E co /Y co and t/R. It was shown in [36][37][38] that the dimensionless tribological parameters, such as the critical load and interference, are only related to the above four dimensionless parameters even for different E su and R values. The present dimensionless coating thickness t/R differs from previously used normalization by the radius of contact area e.g.…”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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

2020

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“…The load-interference and interference-contact area relations under the slip contact condition differ from those in Ref. [24] by less than 0.5% and 2%, respectively, and those under the stick contact condition [25] by less than 4% and 5%, respectively.…”

Section: Finite Element Modelmentioning

confidence: 65%

“…Subsequently, they normalized the contact parameters by critical values at the second yield inception and obtained universal dimensionless relations for load-displacement and contact area-displacement in elastic-plastic regime [24]. Ronen et al [25] compared the plasticity evolution and contact parameters under slip and stick conditions and observed that the effect of contact condition was negligible except for a phenomenon occurring close to the contact area.…”

Section: Introductionmentioning

confidence: 99%

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

Zhou

Etsion

2018

Friction

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Finite element analysis is used to investigate an elastic-plastic coated spherical contact in full stick contact condition under combined normal and tangential loading. Sliding inception is associated with a loss of tangential stiffness. The effect of coating thickness on the static friction coefficient is intensively investigated for the case of hard coatings. For this case, with the increase in coating thickness, the static friction coefficient first increases to its maximum value at a certain coating thickness, thereafter decreases, and eventually levels off. The effect of the normal load and material properties on this behavior is discussed. Finally, a model for the static friction coefficient as a function of the coating thickness is provided for a wide range of material properties and normal loading.

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“…Numerical methods using the finite element model are applied to the study of stick and sliding contact, [8][9][10] which focus on the initial stage of yielding under full stick, partial slip, and full slip conditions, including the effect of coating. Holmberg 11 studied the stress field, plastic strain, and the pileup for spherical sliding contacts.…”

Section: Introductionmentioning

confidence: 99%

An elastoplastic finite element study of cylindrical plane-strain contact for steel/steel and Inconel 617/Incoloy 800H undergoing unidirectional sliding

Yang

Green

2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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The current work employs a two-dimensional plane strain finite element analysis to investigate the unidirectional sliding contact between a deformable half-cylinder and a deformable flat block. The unidirectional sliding is governed by a displacement-controlled action where the materials of the two contacting bodies are first set to identical steels at 20 ℃ and then to Inconel 617 and Incoloy 800H at 800 ℃. First, a normal interference (indentation) is applied, which is followed by unidirectional sliding. The von Mises stress distribution, plastic strain distribution, junction growth, normal force, tangential force, effective coefficient of friction, and scars on the surface of the block are obtained during the sliding motion. The leading edge of the contacting area and the bulk material under the leading edge experience large von Mises stresses. The large plastic strain is found on the surface of the block, and forms a “pocket” shape under the surface. The junction growth is also investigated, showing the direction of the growth is in the same direction of the tangential force that the weaker material experiences. The forces and the effective coefficient of friction are found to stabilize after a certain sliding distance, and the effective coefficient of friction converges to the coefficient of friction used in the model. Pileup is found on the surface of the block after a sufficient unidirectional sliding distance.

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A comparison of stick and slip contact conditions for a coated sphere compressed by a rigid flat

Cited by 16 publications

References 33 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

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

An elastoplastic finite element study of cylindrical plane-strain contact for steel/steel and Inconel 617/Incoloy 800H undergoing unidirectional sliding

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