On the role of adhesion and roughness in stick-slip transition at the contact of two bodies: A numerical study

M. Bazrafshan (Corresponding Author), M. B. de Rooij, D. J. Schipper

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Abstract

This paper proposes a boundary element model for the stick-slip transition at the contact of two bodies of dissimilar materials in presence of adhesion due to van der Waals force. The adhesion is modeled using a Dugdale approximation of adhesive energy. The coupling between the normal pressure and shear stresses is included so that there is no full-stick condition, even in the absence of an external shear stress. Furthermore, the evolution of the slip area over the contact area is different from the well-known Cattaneo-Mindlin solution due to the difference in the mechanical properties of the contacting bodies. It is also shown that the adhesion increases the pre-sliding distance and the static friction. While roughness can only increase the former one. However, the combined effect of roughness and adhesion on the pre-sliding distance is not cumulative as these two parameters are found to be symbiotic.

Original languageEnglish
Pages (from-to)381-388
Number of pages8
JournalTribology international
Volume121
DOIs
Publication statusPublished - 1 May 2018

Fingerprint

Stick-slip
adhesion
slip
roughness
Adhesion
Surface roughness
shear stress
sliding
Shear stress
Insulator Elements
static friction
Dissimilar materials
Van der Waals forces
adhesives
Adhesives
mechanical properties
Friction
Mechanical properties
approximation
energy

Keywords

  • Roughness
  • Stick-slip
  • Adhesion

Cite this

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On the role of adhesion and roughness in stick-slip transition at the contact of two bodies : A numerical study. / Bazrafshan, M. (Corresponding Author); de Rooij, M. B.; Schipper, D. J.

In: Tribology international, Vol. 121, 01.05.2018, p. 381-388.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - On the role of adhesion and roughness in stick-slip transition at the contact of two bodies

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AB - This paper proposes a boundary element model for the stick-slip transition at the contact of two bodies of dissimilar materials in presence of adhesion due to van der Waals force. The adhesion is modeled using a Dugdale approximation of adhesive energy. The coupling between the normal pressure and shear stresses is included so that there is no full-stick condition, even in the absence of an external shear stress. Furthermore, the evolution of the slip area over the contact area is different from the well-known Cattaneo-Mindlin solution due to the difference in the mechanical properties of the contacting bodies. It is also shown that the adhesion increases the pre-sliding distance and the static friction. While roughness can only increase the former one. However, the combined effect of roughness and adhesion on the pre-sliding distance is not cumulative as these two parameters are found to be symbiotic.

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