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Shear-Induced Anisotropy in Rough Elastomer Contact.

R Sahli1, G Pallares1,2, A Papangelo3,4

  • 1Univ Lyon, Ecole Centrale de Lyon, ENISE, ENTPE, CNRS, Laboratoire de Tribologie et Dynamique des Systèmes LTDS, UMR 5513, F-69134 Ecully, France.

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Summary
This summary is machine-generated.

Shear forces alter microjunction shapes in elastic contacts, creating anisotropy. This finding reveals a new factor influencing rough contact mechanics and friction.

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Area of Science:

  • Materials Science
  • Tribology
  • Solid Mechanics

Background:

  • True contact between rough solids involves numerous microjunctions.
  • Microjunction size and shape influence friction, wear, stiffness, and electrical resistance.
  • Understanding microjunction behavior is crucial for predicting macroscopic contact properties.

Purpose of the Study:

  • To investigate how shear force affects microjunction shape in rough elastomer contacts.
  • To determine if smooth sphere-plane contacts exhibit similar shear-induced anisotropic behavior.
  • To elucidate the underlying physical mechanisms of shear-induced anisotropy.

Main Methods:

  • Experimental analysis of microjunction shape changes under varying shear forces.
  • Comparison of rough elastomer contacts with smooth sphere-plane contacts.
  • Application of a fracture-based adhesive contact mechanics model.

Main Results:

  • Microjunction shape significantly varies with applied shear force in rough elastomer contacts.
  • This variation leads to the development of contact interface anisotropy, which saturates during sliding.
  • Smooth sphere-plane contacts demonstrate analogous shear-induced anisotropic behavior, following a common scaling law.

Conclusions:

  • Shear-induced anisotropy is a generic phenomenon in rough elastic contacts.
  • Current contact mechanics models may overlook this anisotropy, impacting predictions of interface properties.
  • The findings provide a deeper understanding of adhesive friction and contact mechanics in elastomers.