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ELASTIC RELAXATION OF INDENTED COATED SUBSTRATES USING A COATED CAVITY MODEL

FORD, IJ; (1994) ELASTIC RELAXATION OF INDENTED COATED SUBSTRATES USING A COATED CAVITY MODEL. SURF COAT TECH , 67 (1-2) 119 - 123.

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Abstract

The elastic and plastic properties of materials can be measured very conveniently using depth-sensing nanoindenters, although some interpretation of the results is necessary in order to remove the effects of elastic sinking-in of the impression under load. The interpretation of the indentation of coated substrates, when the depth of indentation is comparable with the him thickness, is more difficult, however. The elastic unloading curve is non-linear, even for a constant contact area, reflecting the depth dependence of the elastic properties. This makes necessary a more careful calculation of the hardness, based on a model of the elastic properties. A simple model of these properties is proposed, derived for a coated spherical cavity geometry. However, the approach fails to account for the observed behaviour, since the elastic displacements in the real geometry are not radial. A more appropriate treatment of the problem is discussed.

Type:Article
Title:ELASTIC RELAXATION OF INDENTED COATED SUBSTRATES USING A COATED CAVITY MODEL
Keywords:FILMS, HARDNESS, DIAMOND
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy

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