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Mechanical Measurements at a Submicrometric Scale: Viscoelastic Materials

Published online by Cambridge University Press:  21 March 2011

Charlotte Basire  and
Christian Fretigny
Charlotte Basire
Affiliation:
ESPCI/LPQ, CNRS ESA 7069 Systèmes Interfaciaux á l'Echelle Nanométrique 10 rue Vauquelin F-75231 Paris cedex 05, France
Christian Fretigny
Affiliation:
ESPCI/LPQ, CNRS ESA 7069 Systèmes Interfaciaux á l'Echelle Nanométrique 10 rue Vauquelin F-75231 Paris cedex 05, France
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Abstract

Adhesive and tribological properties of the tip of an AFM on viscoelastic samples are studied. The kinetics of the indentation process is shown to be governed by bulk rather than by contact edge dissipations. It is shown that the transition from static to dynamic friction regimes takes place at a critical strain. During the static friction regime, the contact size remains nearly constant. Owing to this property, viscoelastic moduli is measured in this regime. Obtained results, characteristic of a micrometric domain are in a very good agreement with the same properties measured on centimetric samples using dynamical mechanical analysis. Finally, a stick-slip friction regime is observed in a range of velocities.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 651: Symposium T – Dynamics in Small Confining Systems V , 2000 , T6.4.1
Copyright
Copyright © Materials Research Society 2001

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