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Texture-induced modulations of friction force: the fingerprint effect.
MedLine Citation:
PMID:  22107386     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Modulations of the friction force in dry solid friction are usually attributed to macroscopic stick-slip instabilities. Here we show that a distinct, quasistatic mechanism can also lead to nearly periodic force oscillations during sliding contact between an elastomer patterned with parallel grooves, and abraded glass slides. The dominant oscillation frequency is set by the ratio between the sliding velocity and the grooves period. A model is derived which quantitatively captures the dependence of the force modulations amplitude with the normal load, the grooves period, and the slides roughness characteristics. The model's main ingredient is the nonlinearity of the friction law. Since such nonlinearity is ubiquitous for soft solids, this "fingerprint effect" should be relevant to a large class of frictional configurations and have important consequences in human digital touch.
Authors:
E Wandersman; R Candelier; G Debrégeas; A Prevost
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Publication Detail:
Type:  Journal Article     Date:  2011-10-11
Journal Detail:
Title:  Physical review letters     Volume:  107     ISSN:  1079-7114     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2011 Oct 
Date Detail:
Created Date:  2011-11-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  164301     Citation Subset:  IM    
Affiliation:
Laboratoire Jean Perrin, Ecole Normale Supérieure, UPMC Université Paris 6, CNRS FRE 3231, 24 rue Lhomond, 75005 Paris, France.
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