The resolution dependence of measured fractal characteristics for a real un-dismantled electrical contact interface

Swingler, Jonathan (2009) The resolution dependence of measured fractal characteristics for a real un-dismantled electrical contact interface. Wear, 1-22. (doi:10.1016/j.wear.2009.12.034).

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Original Publication URL: http://dx.doi.org/10.1016/j.wear.2009.12.034

Description/Abstract

An electrical contact interface is visualized by rendering “contact maps” from X-Ray Computer Tomography (CT) images without the need for dismantling the specimens. The contact maps consist of approximately 1500 x 1500 pixels with each pixel relating to an 8.0m by 8.0m by 8.0m volume at the interface. The specimens consist of bolting a cable lug to a printed circuit board. The resolution dependence of measured fractal characteristics is studied for a contact interface with a normal force of 1.6 kN. The total mechanical area of contact, Am, is found to be invariant with resolution whereas the largest contact spot size, AL, is found to decrease with higher resolution. The number of spots on the apparent area of contact is found to increase with resolution but a spot increasingly has areas of non-contact within itself at higher resolution. The fractal dimension, D, of the spot area is found to converge to 1 at lower resolution consistent with self-affinity behaviour. At higher resolution D converges to a value <2

Item Type:	Article
ISSNs:	0043-1648 (print)
Related URLs:	http://www.sciencedirect.com/s...&_docancho http://dx.doi.org/10.1016/j.we...009.12.034
Keywords:	contact, contact maps, spot size, x-ray tomography
Subjects:	Q Science > Q Science (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	University Structure - Pre August 2011 > School of Engineering Sciences > Electro-Mechanical Engineering
Item ID:	71743
Date Deposited:	04 Jan 2010
Last Modified:	01 Jun 2011 05:17
Contributors:	Swingler, Jonathan (Author)
Date:	December 2009
Status:	Published
Contact Email Address:	j.swingler@soton.ac.uk
URI:	http://eprints.soton.ac.uk/id/eprint/71743

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