The Evolution of Static Friction for Elastic-Plastic Spherical Contact in Pre-sliding

Zolotarevskiy, Vadim; Kligerman, Y.; Etsion, I.

doi:10.1115/1.4004304

Cited by 19 publications

(7 citation statements)

References 24 publications

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“…Under combined normal and tangential loading in the stick condition, the present tangential displacement-tangential load relations under a wide range of normal loads differ from those in Ref. [33] by less than 7%.…”

Section: Finite Element Modelcontrasting

confidence: 69%

“…By defining the tangential force at sliding inception as the static friction force, they obtained the static friction coefficient as a decreasing function of normal loading. Additionally, Zolotarevskiy et al [33] showed the evolution of tangential force from the initiation of tangential loading to sliding inception. In both Refs.…”

Section: Introductionmentioning

confidence: 99%

“…In both Refs. [32] and [33], the material is bilinear elastic-plastic with 2% tangent modulus of isotropic linear hardening. Bhagwat et al [34] reported that a larger tangent modulus results in a higher friction coefficient.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Finite Element Modelcontrasting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

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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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“…[29] for a critical review of these assumptions. More recently, the friction coefficient based on material yielding and junction growth has been studied for a fully adhered contact which shows dependency on normal load [30][31][32], However, since we study energy dissipation due to interfacial slip we use the Coulomb fric tion coefficient at the interface. In our rigid-on-deformable contact model, the elastic mismatch can be quantified as (Dundurs' parameter [33])…”

Section: Fem Of the Spherical Contactmentioning

confidence: 99%

Frictional Energy Dissipation in Spherical Contacts Under Presliding: Effect of Elastic Mismatch, Plasticity and Phase Difference in Loading

Patil

Eriten

2015

Journal of Applied Mechanics

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Behavior of friction at material interfaces is inherently nonlinear causing variations and uncertainties in interfacial energy dissipation. A finite element model (FEM) of an elastic-plastic spherical contact subjected to periodic normal and tangential loads is developed to study fundamental mechanisms contributing to the frictional energy dissipa tion. Particular attention is devoted to three mechanisms: the elastic mismatch between contacting pairs, plastic deformations, and phase difference between the normal and tan gential fluctuations in loading. Small tangential loads simulating mild vibrational envi ronments are applied to the model and resulting friction (hysteresis) loops are used to estimate the energy loss per loading cycle. The energy losses are then correlated against the maximum tangential load as a power-law where the exponents show the degree of nonlinearity. Exponents increase significantly with in-phase loading and increasing plas ticity. Although increasing elastic mismatch facilitates more dissipation during normal load fluctuations, it has negligible influence on the power-law exponents in tangential loading. Among all the configurations considered, out-of-phase loading with minimal mismatch and no plasticity lead to the smallest power-law exponents; promising linear frictional dissipation. The duration the contact remains stuck during a loading cycle is found to have a predominant influence on the power-law exponents. Thus, controlling that duration enables tunable degree of nonlinearity and magnitude in frictional energy dissipation.

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“…[144]; they found an empirical relation between the contact area and the normal preload by fitting to FEM results. The contact of a deformable sphere under combined normal and tangential loading by a rigid flat in the presliding regime was investigated by Zolotarevskiy et al [145], who developed a model for the evolution of the static friction force and stiffness. During the process of increasing the tangential load with a normal preload, Brizmer et al [143] found that the static friction coefficient is independent of the sphere radius and only slightly affected by the material properties.…”

Section: Combined Normal and Tangential Loading 81 Sphere Normal Andmentioning

confidence: 99%

A Review of Elastic–Plastic Contact Mechanics

Ghaednia

Wang

Saha

et al. 2017

Applied Mechanics Reviews

220

120

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In typical metallic contacts, stresses are very high and result in yielding of the material. Therefore, the study of contacts which include simultaneous elastic and plastic deformation is of critical importance. This work reviews the current state-of-the-art in the modeling of single asperity elastic–plastic contact and, in some instances, makes comparisons to original findings of the authors. Several different geometries are considered, including cylindrical, spherical, sinusoidal or wavy, and axisymmetric sinusoidal. As evidenced by the reviewed literature, it is clear that the average pressure during heavily loaded elastic–plastic contact is not governed by the conventional hardness to yield strength ratio of approximately three, but rather varies according to the boundary conditions and deformed geometry. For spherical contact, the differences between flattening and indentation contacts are also reviewed. In addition, this paper summarizes work on tangentially loaded contacts up to the initiation of sliding. As discussed briefly, the single asperity contact models can be incorporated into existing rough surface contact model frameworks. Depending on the size of a contact, the material properties can also effectively change, and this topic is introduced as well. In the concluding discussion, an argument is made for the value of studying hardening and other failure mechanisms, such as fracture as well as the influence of adhesion on elastic–plastic contact.

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The Evolution of Static Friction for Elastic-Plastic Spherical Contact in Pre-sliding

Abstract: The evolution of static friction and tangential stiffness in presliding of an elastic-plastic sphere in contact with a rigid flat, under full stick contact condition, is analyzed. Empirical dimensionless equations are developed for these parameters.

Cited by 19 publications

References 24 publications

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

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

Frictional Energy Dissipation in Spherical Contacts Under Presliding: Effect of Elastic Mismatch, Plasticity and Phase Difference in Loading

A Review of Elastic–Plastic Contact Mechanics

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