Nonlinear friction of a damped dimer sliding on a periodic substrate
Autor(a) principal: | |
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Data de Publicação: | 2004 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/104293 |
Resumo: | The nonlinear sliding friction of a dimer over a substrate is studied within a one-dimensional model, consisting of a vibrating dimer (two masses connected by a spring), internally damped, sliding over a sinusoidal potential. Molecular dynamics simulations show that the friction force has an approximate v−3 dependence if the velocity is sufficiently large, and that there is a striking periodic variation of the proportionality coefficient with the ratio of the length of the dimer to the substrate wavelength. The nonlinear velocity dependence was predicted earlier for a Langevin model of an adsorbed layer in the presence of strong external force. We study it here in detail in the transient regime and without external force. We obtain the dependence on key parameters (internal dissipation, dimer mass, substrate corrugation, and length ratio), and examine the validity of the friction law. A semianalytical expression is suggested which confirms the numerical observations in the high-velocity regime. |
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Goncalves, SebastianKenkre, V. M.Bishop, A. R.2014-10-09T02:13:05Z20041098-0121http://hdl.handle.net/10183/104293000503760The nonlinear sliding friction of a dimer over a substrate is studied within a one-dimensional model, consisting of a vibrating dimer (two masses connected by a spring), internally damped, sliding over a sinusoidal potential. Molecular dynamics simulations show that the friction force has an approximate v−3 dependence if the velocity is sufficiently large, and that there is a striking periodic variation of the proportionality coefficient with the ratio of the length of the dimer to the substrate wavelength. The nonlinear velocity dependence was predicted earlier for a Langevin model of an adsorbed layer in the presence of strong external force. We study it here in detail in the transient regime and without external force. We obtain the dependence on key parameters (internal dissipation, dimer mass, substrate corrugation, and length ratio), and examine the validity of the friction law. A semianalytical expression is suggested which confirms the numerical observations in the high-velocity regime.application/pdfengPhysical Review. B, Condensed matter and materials physics. Vol. 70, no. 19 (Nov. 2004), 195415, p. 5Física da matéria condensadaDinâmica molecularFricçãoNonlinear friction of a damped dimer sliding on a periodic substrateEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000503760.pdf000503760.pdfTexto completo (inglês)application/pdf64962http://www.lume.ufrgs.br/bitstream/10183/104293/1/000503760.pdf4c72c3cac329b18b4cbdda350f5916dcMD51TEXT000503760.pdf.txt000503760.pdf.txtExtracted Texttext/plain22255http://www.lume.ufrgs.br/bitstream/10183/104293/2/000503760.pdf.txt8b921a63bac8650956e36bb681d58a17MD52THUMBNAIL000503760.pdf.jpg000503760.pdf.jpgGenerated Thumbnailimage/jpeg1962http://www.lume.ufrgs.br/bitstream/10183/104293/3/000503760.pdf.jpg59b3d883f421da04aede448a89a3ec40MD5310183/1042932024-05-19 05:46:17.598902oai:www.lume.ufrgs.br:10183/104293Repositório InstitucionalPUBhttps://lume.ufrgs.br/oai/requestlume@ufrgs.bropendoar:2024-05-19T08:46:17Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Nonlinear friction of a damped dimer sliding on a periodic substrate |
title |
Nonlinear friction of a damped dimer sliding on a periodic substrate |
spellingShingle |
Nonlinear friction of a damped dimer sliding on a periodic substrate Goncalves, Sebastian Física da matéria condensada Dinâmica molecular Fricção |
title_short |
Nonlinear friction of a damped dimer sliding on a periodic substrate |
title_full |
Nonlinear friction of a damped dimer sliding on a periodic substrate |
title_fullStr |
Nonlinear friction of a damped dimer sliding on a periodic substrate |
title_full_unstemmed |
Nonlinear friction of a damped dimer sliding on a periodic substrate |
title_sort |
Nonlinear friction of a damped dimer sliding on a periodic substrate |
author |
Goncalves, Sebastian |
author_facet |
Goncalves, Sebastian Kenkre, V. M. Bishop, A. R. |
author_role |
author |
author2 |
Kenkre, V. M. Bishop, A. R. |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Goncalves, Sebastian Kenkre, V. M. Bishop, A. R. |
dc.subject.por.fl_str_mv |
Física da matéria condensada Dinâmica molecular Fricção |
topic |
Física da matéria condensada Dinâmica molecular Fricção |
description |
The nonlinear sliding friction of a dimer over a substrate is studied within a one-dimensional model, consisting of a vibrating dimer (two masses connected by a spring), internally damped, sliding over a sinusoidal potential. Molecular dynamics simulations show that the friction force has an approximate v−3 dependence if the velocity is sufficiently large, and that there is a striking periodic variation of the proportionality coefficient with the ratio of the length of the dimer to the substrate wavelength. The nonlinear velocity dependence was predicted earlier for a Langevin model of an adsorbed layer in the presence of strong external force. We study it here in detail in the transient regime and without external force. We obtain the dependence on key parameters (internal dissipation, dimer mass, substrate corrugation, and length ratio), and examine the validity of the friction law. A semianalytical expression is suggested which confirms the numerical observations in the high-velocity regime. |
publishDate |
2004 |
dc.date.issued.fl_str_mv |
2004 |
dc.date.accessioned.fl_str_mv |
2014-10-09T02:13:05Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
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article |
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publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/104293 |
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1098-0121 |
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000503760 |
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1098-0121 000503760 |
url |
http://hdl.handle.net/10183/104293 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physical Review. B, Condensed matter and materials physics. Vol. 70, no. 19 (Nov. 2004), 195415, p. 5 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
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