A microtensile set up for characterising the mechanical properties of films
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A microtensile set up for characterising the mechanical properties of films B. Cyziute1, L. Augulis1, J. Bonneville2, P. Goudeau2, B. Lamongie2, S. Tamulevicius1, C. Templier2 1 2
Fizikos katedra, Kauno Technologijos Universitetas, Studentu 50, 3028, Kaunas, Lithuania Laboratoire de Métallurgie Physique, Université de Poitiers, UMR-CNRS 6630, BP 30179, 86962 Futuroscope, France
Abstract A computer control deformation set-up has been specifically developed for measuring the elastic and plastic properties of thin films. It combines a piezo-actuated microtensile-testing device, based on an original tripod design, with an optical image acquiring and analysis system for measuring specimen strains. The paper will be partly devoted to describe the experimental deformation set up and its performance through mechanical tests of polyimide and aluminum samples. The Young’s moduli, which are deduced from the stress-strain curves, are in good agreement with reported bulk average values. The results confirmed the ability of the equipment for the measurements of very small load and displacement levels, which are a prerequisite for such type of investigations. Keywords: Thin film, tensile test, mechanical properties, load relaxation.
I. Introduction Mechanical properties of low dimensional materials are not yet well understood. A great amount of instrumental and theoretical works have been devoted since a lot of years for analyzing the mechanical behavior of nanostructured materials prepared through very different elaboration procedures. Evaluating the mechanical properties, dynamic behaviors of such components, is still a challenge in mechanical engineering. We have developed a computer control deformation set up specifically designed for investigating the elastic and plastic properties of thin films. The equipment performances have been first evaluated by preliminary tensile tests on 30 µm thick aluminum sheets of commercial purity and on polymer foils with thickness 25 µm. The results confirmed the ability of the equipment for the measurements of very small load and displacement levels, which are a prerequisite for such type of investigations. The paper will be partly focused on the experimental deformation set up. In particular, the tensile set-up will be presented together with the specimen holder. The deformation measurements, based on an optical analysis, will be briefly described. Finally, preliminary results concerning Young’s modulus, Poisson’s ratio and activation volume are reported and tentatively discussed in connection with published data available in the literature.
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II. Experimental details II.1. Tensile testing device: A prototype of the testing apparatus has already been presented elsewhere [1]. A fundamental modification concerns the deformation measurement, that was originally determined by electronic speckle pattern interferometry and which has now been replaced by an optical digital image correlation method (described below). As shown in figure 1, a tripod configuration is used and the dis
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