Abstract
The tribological behavior of oriented poly(tetrafluoroethylene) (PTFE) sliding surfaces isexamined as a function of sliding direction and applied normal load in classical moleculardynamics (MD) simulations. The forces are calculated with the second-generation reactiveempirical bond-order potential for short-range interactions, and with a Lennard-Jonespotential for long-range interactions. The range of applied normal loads considered is5–30 nN. The displacement of interfacial atoms from their initial positions during sliding isfound to vary by a factor of seven, depending on the relative orientation of the slidingchains. However, within each sliding configuration the magnitude of the interfacialatomic displacements exhibits little dependence on load over the range considered.The predicted friction coefficients are also found to vary with chain orientationand are in excellent quantitative agreement with experimental measurements.
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