Title: Adhesion and Elasticity in Nanoscale Indentation
Citation: APPLIED PHYSICS LETTERS vol. 89 no. 243118 p. 1-3
Publication Year: 2006
JRC N°: JRC36108
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC36108
Type: Articles in periodicals and books
Abstract: The present work proposes an extension of Oliver-Pharr analysis [J. Mater. Res. 7, 1564 (1992)] of unloading force-displacement data obtained in nanoscale indentation experiments to account for contact adhesion. The loading force is considered a sum of the contact elastic and adhesion forces. During the unloading, both forces suffer variations. For conical geometry, the unloading force-displacement curve is described by a sum of a quadratic term (accounting for the elastic force) and a linear term (accounting for adhesive force). Results of atomic force microscopy indentation experiments performed with sharpened silicon tips on poly(dimethylsiloxane) agreed well with the prediction of the proposed theoretical model.
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