Research Papers

On Slip Inception and Static Friction for Smooth Dry Contact

[+] Author and Article Information
Xi Shi

School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: xishi@sjtu.edu.cn

1Corresponding author.

Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received July 14, 2014; final manuscript received October 5, 2014; accepted manuscript posted October 10, 2014; published online October 23, 2014. Editor: Yonggang Huang.

J. Appl. Mech 81(12), 121005 (Oct 23, 2014) (7 pages) Paper No: JAM-14-1307; doi: 10.1115/1.4028753 History: Received July 14, 2014; Revised October 05, 2014; Accepted October 10, 2014

Slip inception mechanism is very important for modeling of static friction and understanding of some experimental observations of friction. In this work, slip inception was treated as a local competence of interfacial bonding failure and weaker material failure. At any contacting point, if bond shear strength is weaker than softer material shear strength, slip inception is governed by interfacial bonding failure. Otherwise, it is governed by softer material failure. Considering the possible co-existence of these two slip inception mechanisms during presliding, a hybrid static friction model for smooth dry contact was proposed, which indicates that the static friction consists of two components: one contributed by contact area where bonding failure is dominant and the other contributed by contact area where material failure is dominant. With the proposed static friction model, the effects of contact pressure, the material properties, and the contact geometry on static friction were discussed.

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Fig. 1

Localized shear strength versus contact pressure for Coulomb friction [25]

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Fig. 2

Localized shear strength versus contact pressure based on Ref. [10]

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Fig. 3

Localized shear strength versus contact pressure based on Ref. [31]

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Fig. 4

Localized shear strength versus contact pressure based on Ref. [33]

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Fig. 5

Localized shear strength base on von Mises criterion

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Fig. 6

Proposed slip inception model: localized shear strength versus contact pressure

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Fig. 7

Different localized shear strength behaviors at low contact pressure due to various interfacial bonding at static friction condition

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Fig. 8

Diagram of a sphere in contact with a flat

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Fig. 9

Predicted static friction coefficient versus dimensionless mean contact pressure for both spherical and cylindric line contacts

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Fig. 10

Effect of yield strength of soft material on localized shear strength

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Fig. 11

Effect of the ratio k on predicted static friction coefficient for spherical contact




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