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Evolution of the True Contact Area of Laser Textured Tungsten Under Dry Sliding Conditions

Lechthaler, Björn; Ochs, Georg; Mücklich, Frank; Dienwiebel, Martin

Abstract:
Despite the great importance of the real contact area, it is a parameter which, depending
on the tribological system, is difficult or impossible to obtain experimentally. In this
work, a combination of methods was used to estimate the development of the real
contact surface, and the results were compared with the friction coefficient course. The
measurements were carried out with a home-built in situ tribometer, which records a
3D image of the surface after each individual friction cycle. A tungsten sample was
treated by laser interference with a line-like pattern to produce a deterministic surface.
This allowed for more precise tracking of the real contact area when combined with the
use of an inert corundum sphere as a counter-body. The real contact area was calculated
numerically from the height information obtained using a contact application. Finally, the
true contact surface was compared with the parallel-recorded friction values. After a short
running-in phase, the friction behavior and the real contact surface showed comparable
courses. This indicates that the changes in the real contact area could explain the friction
behavior of the laser-patterned sample, and the methodology was proven to be suitable
for experimentally estimating the real contact area.

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Verlagsausgabe §
DOI: 10.5445/IR/1000090696
Veröffentlicht am 08.02.2019
Originalveröffentlichung
DOI: 10.3389/fmech.2019.00003
Coverbild
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Computational Materials Science (IAM-CMS)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 2297-3079
urn:nbn:de:swb:90-906962
KITopen-ID: 1000090696
Erschienen in Frontiers in mechanical engineering
Band 5
Seiten Article no 3
Projektinformation DFG, DFG EIN, DI 1494/4-1
Vorab online veröffentlicht am 08.02.2019
Schlagworte direct laser interference patterning, dry friction, in-situ tribometer, real contact area, asperity contacts
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