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Experimental Mechanics
Erschienen in: Experimental Mechanics 3/2011

01.03.2011

Determination of the Frictional Properties of Titanium and Nickel Alloys Using the Digital Image Correlation Method

verfasst von: M. E. Kartal, D. M. Mulvihill, D. Nowell, D. A. Hills

Erschienen in: Experimental Mechanics | Ausgabe 3/2011

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Abstract

The paper describes experiments to investigate the frictional properties of a Titanium alloy (Ti-6Al-4V) and a Nickel alloy (Udimet 720) under representative engineering conditions. Flat fretting pads with rounded corners were clamped against a flat specimen and a servo-hydraulic tensile testing machine was used to apply cyclic displacement to the specimen. Slip displacement between the specimen and pad was measured remotely using an LVDT and locally using digital image correlation. The latter approach allowed accurate determination of the tangential contact stiffness from frictional hysteresis loops. The results obtained show that the contacts are significantly less stiff than would be predicted by a smooth elastic contact analysis. A finite element model of the experimental contact geometry was constructed and it was shown that good agreement with the experimental measurements of contact stiffness can be obtained with a suitable choice of elastic modulus for a compliant surface layer.
Vorheriger Artikel A Device Enhancement for the Dry Sliding Friction Coefficient Measurement Between Steel 1080 and VascoMax with Respect to Surface Roughness Changes
Nächster Artikel A New Six-axis Load Cell. Part I: Design

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Fußnoten
1
Blades are frequently fitted into the disks of a gas turbine so that they can be easily removed in the event of damage or if one component becomes life-expired. The joint takes the form of a male and female wedges and is referred to as a ‘dovetail’ (after the similar joint in carpentry). A multiple lobe geometry is referred to as a ‘firtree’ joint, and this is sometimes used where insufficient strength is obtained with a dovetail.
 
2
Some contact occurs on the rounded parts of the pad profile, so that the actual contact area is slightly larger than 80 mm2
 
3
It would, of course, have been possible to write a script to identify the relevant point in the loops, but it would have been necessary to make this sufficiently robust to cope with different shapes of loop in the region close to the onset of sliding. Overall it was decided that it was simpler in this case to examine the loops manually.
 
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Metadaten
Titel
Determination of the Frictional Properties of Titanium and Nickel Alloys Using the Digital Image Correlation Method
verfasst von
M. E. Kartal
D. M. Mulvihill
D. Nowell
D. A. Hills
Publikationsdatum
01.03.2011
Verlag
Springer US
Erschienen in
Experimental Mechanics / Ausgabe 3/2011
Print ISSN: 0014-4851
Elektronische ISSN: 1741-2765
DOI
https://doi.org/10.1007/s11340-010-9366-y

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