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Luan B, Robbins MO. Contact of single asperities with varying adhesion: comparing continuum mechanics to atomistic simulations. Phys Rev E Stat Nonlin Soft Matter Phys. 2006;74(2):026111doi: 10.1103/PhysRevE.74.026111.
Luan, B., & Robbins, M. O. (2006). Contact of single asperities with varying adhesion: comparing continuum mechanics to atomistic simulations. Physical review. E, Statistical, nonlinear, and soft matter physics, 74(2), 026111. https://doi.org/10.1103/PhysRevE.74.026111
Luan, Binquan, and Robbins, Mark O. "Contact of single asperities with varying adhesion: comparing continuum mechanics to atomistic simulations." Physical review. E, Statistical, nonlinear, and soft matter physics vol. 74,2 (2006): 026111. doi: https://doi.org/10.1103/PhysRevE.74.026111
Luan B, Robbins MO. Contact of single asperities with varying adhesion: comparing continuum mechanics to atomistic simulations. Phys Rev E Stat Nonlin Soft Matter Phys. 2006 Aug;74(2):026111. doi: 10.1103/PhysRevE.74.026111. Epub 2006 Aug 15. PMID: 17025507.
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Phys Rev E Stat Nonlin Soft Matter Phys. 2006 Aug;74(2):026111. doi: 10.1103/PhysRevE.74.026111. Epub 2006 Aug 15.

Contact of single asperities with varying adhesion: comparing continuum mechanics to atomistic simulations.

Physical review. E, Statistical, nonlinear, and soft matter physics

Binquan Luan, Mark O Robbins

Affiliations

  1. Department of Physics and Astronomy, The Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA.

PMID: 17025507 DOI: 10.1103/PhysRevE.74.026111

Abstract

Atomistic simulations are used to test the equations of continuum contact mechanics in nanometer scale contacts. Nominally spherical tips, made by bending crystals or cutting crystalline or amorphous solids, are pressed into a flat, elastic substrate. The normal displacement, contact radius, stress distribution, friction, and lateral stiffness are examined as a function of load and adhesion. The atomic scale roughness present on any tip made of discrete atoms is shown to have profound effects on the results. Contact areas, local stresses, and the work of adhesion change by factors of 2 to 4, and the friction and lateral stiffness vary by orders of magnitude. The microscopic factors responsible for these changes are discussed. The results are also used to test methods for analyzing experimental data with continuum theory to determine information, such as contact area, that cannot be measured directly in nanometer scale contacts. Even when the data appear to be fit by continuum theory, extracted quantities can differ substantially from their true values.

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