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Experimental measurement and numerical simulation of the plastic strain during indentation and scratch tests on polymeric surfaces

Published online by Cambridge University Press:  31 January 2011

Hervé Pelletier ,
Christian Gauthier  and
Robert Schirrer
Hervé Pelletier*
Affiliation:
Institut Charles Sadron, UPR 22 CNRS F-67034 Strasbourg, Cedex 2, France
Christian Gauthier
Affiliation:
Institut Charles Sadron, UPR 22 CNRS F-67034 Strasbourg, Cedex 2, France
Robert Schirrer
Affiliation:
Institut Charles Sadron, UPR 22 CNRS F-67034 Strasbourg, Cedex 2, France
*
a) Address all correspondence to this author. e-mail: pelletier@ics.u-strasbg.fr
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Abstract

For elastic–plastic contacts, we propose a complete description of the plastic strain field beneath the indenter during indentation and scratch with a spherical indenter (with R, the tip radius), as a function of the testing conditions, defined by the geometrical strain, noted a/R (with a, the contact radius), and the local friction coefficient μloc. The main parameter of the description is the level of the plastic deformation imposed during test into amorphous polymeric surfaces, related in first approximation to the ratio a/R. An equivalent average plastic strain, noted (εp)av, is calculated over a representative plastically deformed volume, both for indentation and scratch tests. The equivalent average plastic strain (εp)av, is observed to increase with the ratio a/R, as predicted by the empirical Tabor's rule, but also with the local friction coefficient μloc for a given ratio a/R, especially during scratching. The plastic zone dimensions and the plastic strain gradient developed beneath the moving tip are shown to depend both on the geometrical strain a/R and also on the friction coefficient μloc.

Keywords

NanoindentationPolymerTribology
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 3 , March 2009 , pp. 1184 - 1196
Copyright
Copyright © Materials Research Society 2009

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References

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