Plasticity evolution in a coated sphere compressed by a rigid flat

Zhou, C.; Goltsberg, Roman; Etsion, I.

doi:10.1016/j.triboint.2016.02.004

Cited by 19 publications

(22 citation statements)

References 36 publications

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“…This hardening enables to compare the results of this paper to those published for the slip contact condition in Ref. [34]. As was stated in Ref.…”

Section: Coated Sphere Under the Slip Contact Condition [25 34]supporting

confidence: 67%

“…When the interference increases above that corresponding to the first yield in the coating, c1  , a second yield inception occurs in the substrate at a second critical interference δ c2 (similar to the behavior under the slip contact condition [34]). The empirical expressions obtained from the best fit of the numerical results for the interference, contact load, and contact area at the second yield inception are as follows: …”

Section: Yield Inceptionmentioning

confidence: 65%

“…Chen et al [34] showed that for t/R>(t/R) p , as the interference increases above that corresponding to the first yield in the coating,  c1 , a second yield occurs in the substrate at a second critical interference,  c2 . The empirical expressions for these two critical interferences were given in Ref.…”

Section: Coated Sphere Under the Slip Contact Condition [25 34]mentioning

confidence: 99%

“…[34]. These special cases are: (1) the elastic core in the coating under the contact area completely disappears and a second yielding occurs on the substrate side of the interface; (2) reappearance of the elastic core under the contact area owing to increased plasticity in the substrate; (3) first appearance of a second elastic core in the coating; and (4) merging of the first and second elastic cores in the coating.…”

Section: Plasticity Evolutionmentioning

confidence: 99%

“…All these studies [31−33] examined a limited number of mechanical and geometrical properties of the coating and the substrate materials. Chen et al [34] investigated the elastic-plastic contact of a coated sphere compressed by a rigid flat under the slip contact condition. This was done for relatively thick coating thicknesses, where the first onset of plasticity occurred in the coating and the second on the substrate side of the interface.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

Ronen¹,

Goltsberg²,

Etsion³

2017

Friction

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Abstract:A finite element analysis is used to study the elastic-plastic contact of a coated sphere compressed by a rigid flat under the stick contact condition. This was done for a wide range of hard coating material properties and coating thicknesses. A comparison with the slip contact condition is presented in terms of the critical contact parameters (at yield inception) and plasticity evolution. Empirical expressions are provided for critical interferences of the first and second yield inceptions, in the coating and on the substrate side of the interface, respectively.

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“…This hardening enables to compare the results of this paper to those published for the slip contact condition in Ref. [34]. As was stated in Ref.…”

Section: Coated Sphere Under the Slip Contact Condition [25 34]supporting

confidence: 67%

Section: Yield Inceptionmentioning

confidence: 65%

Section: Coated Sphere Under the Slip Contact Condition [25 34]mentioning

confidence: 99%

Section: Plasticity Evolutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Ronen¹,

Goltsberg²,

Etsion³

2017

Friction

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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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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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Plasticity evolution in a coated sphere compressed by a rigid flat

Cited by 19 publications

References 36 publications

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

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

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

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

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