Saxonian Institute of Surface Mechanics

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Shadow Effects in Nanoindentation - Is It Possible to Extract Information of Every Point Within a Coating Substrate System by Contact Mechanical Testing?

authors:Nick Bierwisch, Norbert Schwarzer
ID:2013-003
date:12/31/2013
static URL:http://www.siomec.de/pubs/2013/003
file size:Not published yet.
citation:Nick Bierwisch, Norbert Schwarzer, “Shadow Effects in Nanoindentation - Is It Possible to Extract Information of Every Point Within a Coating Substrate System by Contact Mechanical Testing?”, SIO Online Archive of Publications, No. 2013-003, 2013, www.siomec.de/pubs/2013/003.
Annotation:

In principle and for completely homogenous materials it is always possible to extract measurement information from certain well selected areas within a half space by the means of normal indentation testing. Within the talk it will be shown how this can be achieved by properly selected measurement conditions with respect to contact area and load or tip shape and load.

Unfortunately, this nice possibility of actually “steering” the “Point Of Interest” POI of any nanoindentation test is not given in the case of layered materials. So, as a mere byproduct of the development of a measurement optimizing software tool for optimum parameters for nanoindentation and scratch it was discovered that it is not possible to select every point in a simple coating substrate system in order to obtain measurement information dominated by an area around that very point. This is caused by “Shadow Effects” coming from either the substrate or the coating and hindering the POI to show the inelastic behavior one is interested in, because inevitable inelastic behavior at other positions within the compound are shadowing the process and point of interest.

It will be shown, that these limitations are principle and thus, certain positions within a coating-substrate compound are inaccessible for ordinary indentation.

Are there ways to still overcome this problem with classical Nanoindenters?

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