High-Velocity Shear and Soft Friction at the Nanometer Scale

We study high-speed friction on soft polymer materials by measuring the amplitude dependence of cyclic lateral forces on the atomic force microscope (AFM) tip as it slides on the surface with fixed contact force. The resulting dynamic force quadrature curves separate the elastic and viscous contribu...

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Autores principales:	Per-Anders Thorén, Riccardo Borgani, Daniel Forchheimer, David B. Haviland
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	frictional force microscopy slip length force quadratures intermodulation atomic force microscopy Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/a7a6146ce5c84e22abe1c11c2697e104
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spelling	oai:doaj.org-article:a7a6146ce5c84e22abe1c11c2697e1042021-12-03T07:04:55ZHigh-Velocity Shear and Soft Friction at the Nanometer Scale2297-307910.3389/fmech.2021.765816https://doaj.org/article/a7a6146ce5c84e22abe1c11c2697e1042021-12-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fmech.2021.765816/fullhttps://doaj.org/toc/2297-3079We study high-speed friction on soft polymer materials by measuring the amplitude dependence of cyclic lateral forces on the atomic force microscope (AFM) tip as it slides on the surface with fixed contact force. The resulting dynamic force quadrature curves separate the elastic and viscous contributions to the lateral force, revealing a transition from stick-slip to free-sliding motion as the velocity increases. We explain force quadratures and describe how they are measured, and we show results for a variety of soft materials. The results differ substantially from the measurements on hard materials, showing hysteresis in the force quadrature curves that we attribute to the finite relaxation time of viscoelastic surface deformation.Per-Anders ThorénRiccardo BorganiDaniel ForchheimerDavid B. HavilandFrontiers Media S.A.articlefrictional force microscopyslip lengthforce quadraturesintermodulationatomic force microscopyMechanical engineering and machineryTJ1-1570ENFrontiers in Mechanical Engineering, Vol 7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	frictional force microscopy slip length force quadratures intermodulation atomic force microscopy Mechanical engineering and machinery TJ1-1570
spellingShingle	frictional force microscopy slip length force quadratures intermodulation atomic force microscopy Mechanical engineering and machinery TJ1-1570 Per-Anders Thorén Riccardo Borgani Daniel Forchheimer David B. Haviland High-Velocity Shear and Soft Friction at the Nanometer Scale
description	We study high-speed friction on soft polymer materials by measuring the amplitude dependence of cyclic lateral forces on the atomic force microscope (AFM) tip as it slides on the surface with fixed contact force. The resulting dynamic force quadrature curves separate the elastic and viscous contributions to the lateral force, revealing a transition from stick-slip to free-sliding motion as the velocity increases. We explain force quadratures and describe how they are measured, and we show results for a variety of soft materials. The results differ substantially from the measurements on hard materials, showing hysteresis in the force quadrature curves that we attribute to the finite relaxation time of viscoelastic surface deformation.
format	article
author	Per-Anders Thorén Riccardo Borgani Daniel Forchheimer David B. Haviland
author_facet	Per-Anders Thorén Riccardo Borgani Daniel Forchheimer David B. Haviland
author_sort	Per-Anders Thorén
title	High-Velocity Shear and Soft Friction at the Nanometer Scale
title_short	High-Velocity Shear and Soft Friction at the Nanometer Scale
title_full	High-Velocity Shear and Soft Friction at the Nanometer Scale
title_fullStr	High-Velocity Shear and Soft Friction at the Nanometer Scale
title_full_unstemmed	High-Velocity Shear and Soft Friction at the Nanometer Scale
title_sort	high-velocity shear and soft friction at the nanometer scale
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/a7a6146ce5c84e22abe1c11c2697e104
work_keys_str_mv	AT perandersthoren highvelocityshearandsoftfrictionatthenanometerscale AT riccardoborgani highvelocityshearandsoftfrictionatthenanometerscale AT danielforchheimer highvelocityshearandsoftfrictionatthenanometerscale AT davidbhaviland highvelocityshearandsoftfrictionatthenanometerscale
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High-Velocity Shear and Soft Friction at the Nanometer Scale

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