Effect of the sliding orientation on the tribological properties of polyethylene in molecular dynamics simulations

Seong Jun Heo, Inkook Jang, Peter R. Barry, Simon R. Phillpot, Scott S. Perry, W. Gregory Sawyer, Susan B. Sinnott

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28 Scopus citations

Abstract

The role of sliding orientation on the tribological properties of polyethylene (PE) is investigated by using classical molecular dynamics simulations. Cross-linked PE surfaces slide against one another in two different directions: one that is perpendicular to and one that is parallel to the aligned direction of the polymer chains. The results indicate that sliding in the parallel direction occurs with a lower friction coefficient than sliding in the perpendicular direction. In both cases, gross level stick-slip motion is observed to be associated with the sliding of a restrained, corrugated molecular interface. In addition, the simulations demonstrate the way in which the system stores more shear strain energy during sliding in the perpendicular direction. The tribological behavior of these PE surfaces is compared to the behavior of similarly modeled polytetrafluoroethylene surfaces; the differences and similarities between the two systems are discussed.

Original languageEnglish (US)
Article number083502
JournalJournal of Applied Physics
Volume103
Issue number8
DOIs
StatePublished - Jan 1 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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