Femtosecond laser full and partial texturing of steel surfaces to reduce friction in lubricated contact (Articolo in rivista)

Type
Label
  • Femtosecond laser full and partial texturing of steel surfaces to reduce friction in lubricated contact (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1515/aot-2014-0045 (literal)
Alternative label
  • Antonio Ancona (1), Giuseppe Carbone (2) , Michele De Filippis (2), Annalisa Volpe (1,3) and Pietro Mario Lugarà (1,3) (2014)
    Femtosecond laser full and partial texturing of steel surfaces to reduce friction in lubricated contact
    in Advanced Optical Technologies
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Antonio Ancona (1), Giuseppe Carbone (2) , Michele De Filippis (2), Annalisa Volpe (1,3) and Pietro Mario Lugarà (1,3) (literal)
Pagina inizio
  • 539 (literal)
Pagina fine
  • 547 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 3 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 5-6 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1 CNR, IFN 2 Department of Mechanics, Mathematics and Management, Politecnico di Bari 3 Department of Physics, Università degli Studi di Bari, (literal)
Titolo
  • Femtosecond laser full and partial texturing of steel surfaces to reduce friction in lubricated contact (literal)
Abstract
  • Minimizing mechanical losses and friction in vehicle engines would have a great impact on reducing fuel consumption and exhaust emissions, to the benefit of environmental protection. With this scope, laser surface texturing (LST) with femtosecond pulses is an emerging technology, which consists of creating, by laser ablation, an array of high-density microdimples on the surface of a mechanical device. The microtexture decreases the effective contact area and, in case of lubricated contact, acts as oil reservoir and trap for wear debris, leading to an overall friction reduction. Depending on the lubrication regime and on the texture geometry, several mechanisms may concur to modify friction such as the local reduction of the shear stress, the generation of a hydrodynamic lift between the surfaces or the formation of eddy-like flows at the bottom of the dimple cavities. All these effects have been investigated by fabricating and characterizing several LST surfaces by femtosecond laser ablation with different features: partial/full texture, circular/elliptical dimples, variable diameters, and depths but equivalent areal density. More than 85% of friction reduction has been obtained from the circular dimple geometry, but the elliptical texture allows adjusting the friction coefficient by changing its orientation with respect to the sliding direction. (literal)
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