Nano-scale roughness effects on hysteresis in micro-scale adhesive contact

Yang, Lingqi; Martini, Ashlie

doi:10.1016/j.triboint.2012.09.003

Cited by 10 publications

(2 citation statements)

References 23 publications

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“…This elongation is characterized by periods of elastic deformation separated by abrupt structural atomic rearrangements in which the length and cross section of the contact change sharply [208,209]. Since those initial studies, many other simulations of soft metals have demonstrated similar behavior, where the formation and separation of a neck of material is characterized by discrete atomic-scale events [210][211][212][213]. These discrete events also correspond to abrupt changes in the contact force.…”

Section: Simulation Support For Atomisticmentioning

confidence: 96%

Measuring and Understanding Contact Area at the Nanoscale: A Review

Jacobs

Martini

2017

Applied Mechanics Reviews

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The size of the mechanical contact between nanoscale bodies that are pressed together under load has implications for adhesion, friction, and electrical and thermal transport at small scales. Yet, because the contact is buried between the two bodies, it is challenging to accurately measure the true contact area and to understand its dependence on load and material properties. Recent advancements in both experimental techniques and simulation methodologies have provided unprecedented insights into nanoscale contacts. This review provides a detailed look at the current understanding of nanocontacts. Experimental methods for determining contact area are discussed, including direct measurements using in situ electron microscopy, as well as indirect methods based on measurements of contact resistance, contact stiffness, lateral forces, and topography. Simulation techniques are also discussed, including the types of nanocontact modeling that have been performed and the various methods for extracting the magnitude of the contact area from a simulation. To describe and predict contact area, three different theories of nanoscale contact are reviewed: single-contact continuum mechanics, multiple-contact continuum mechanics, and atomistic accounting. Representative results from nanoscale experimental and simulation investigations are presented in the context of these theories. Finally, the critical challenges are described, as well as the opportunities, on the path to establishing a fundamental and actionable understanding of what it means to be “in contact” at the nanoscale.

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