Investigation of the Effect of Adhesion Between Two Surfaces on the Frictional Work and Wear at the Nanoscale Using Molecular Dynamics

Document Type : Solid Mechanics

Author

Corresponding author: Assistant Professor, Department of Aviation, Imam Ali University, Tehran, Iran

Abstract

In this study, using Molecular Dynamics (MD) simulations, the effect of adhesion on the removal and separation of materials during the nano-scale scratching process has been studied numerically using the nano-scratching test. The virtual setup simulates the scratching of a flat substrate made of a single crystalline aluminum using a rigid conical indenter with a blunted spherical tip (radius of 20 nm) at four different scratching depths (i.e., 0, 3, 7 and 10 A) was studied. The classical Lenard-Jones interatomic potential is used to model and regulate the adhesion between the atoms of the pen and the substrate, which is 5 to 70% of the interatomic adhesion strength of aluminum atoms. This mimics the effect of the lubricant without modeling it. Although the effect of adhesion has been consistently neglected in previous studies, it has been observed that in scratches with shallower depths, the adhesive will have a significant effect on friction and wear. It is worth noting that in this study, because the effect of plasticity was the main mechanism of wear, according to experimental observations, friction and wear have a linear relationship with each other.

Keywords


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Volume 18, Issue 1 - Serial Number 67
Serial No. 67, Spring Quarterly
July 2022
Pages 161-169
  • Receive Date: 23 August 2021
  • Revise Date: 25 October 2021
  • Accept Date: 02 November 2021
  • Publish Date: 21 April 2022