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dc.contributor.authorGoncalves, Sebastianpt_BR
dc.contributor.authorKenkre, V. M.pt_BR
dc.contributor.authorBishop, A. R.pt_BR
dc.date.accessioned2014-10-09T02:13:05Zpt_BR
dc.date.issued2004pt_BR
dc.identifier.issn1098-0121pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/104293pt_BR
dc.description.abstractThe 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.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofPhysical Review. B, Condensed matter and materials physics. Vol. 70, no. 19 (Nov. 2004), 195415, p. 5pt_BR
dc.rightsOpen Accessen
dc.subjectFísica da matéria condensadapt_BR
dc.subjectDinâmica molecularpt_BR
dc.subjectFricçãopt_BR
dc.titleNonlinear friction of a damped dimer sliding on a periodic substratept_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000503760pt_BR
dc.type.originEstrangeiropt_BR


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