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Experimental Mechanics
Published in: Experimental Mechanics 8/2013

01-10-2013

Kolsky Bar Wave Separation Using a Photon Doppler Velocimeter

Authors: D. T. Casem, M. B. Zellner

Published in: Experimental Mechanics | Issue 8/2013

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Abstract

A method to permit wave separation with a Kolsky bar is described. A photon Doppler velocimeter (PDV) is used to measure particle velocity at the location of each strain-gage. These measurements are used with the measured strain to separate wave-trains that in general exist in each bar (for example, an incident and reflected pulse) even when they are superimposed at the gage location. This can extend the duration of the experiment and permit more freedom in the types of loadings that can be applied to a specimen. It was found that the PDV measurement of particle velocity often contains a significant component due to bending waves. A method to account for bending is described but requires multiple PDV measurements at each gage position.
previous article Simultaneous Measurement of Plate Natural Frequencies and Vibration Mode Shapes Using ESPI
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Footnotes
1
Bending about the y-axis may also be present, but its effect is assumed small since it will result largely in translation in the z-direction, which the probes in Figure 4 are insensitive to.
 
2
A strain gage is a Lagrangian measurement, but the PDV is Eulerian.
 
3
The authors have investigated other methods for measuring particle velocity for wave separation; see [25].
 
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Casem DT, Zellner MB (2012) Measurements of particle velocity within a Kolsky Bar with applications to wave separation. In: Chalivendra V et al. (eds) Dynamic behavior of materials, volume 1: Proceedings of the 2012 Annual Conference on Experimental and Applied Mechanics, Conference Proceedings of the Society for Experimental Mechanics
Metadata
Title
Kolsky Bar Wave Separation Using a Photon Doppler Velocimeter
Authors
D. T. Casem
M. B. Zellner
Publication date
01-10-2013
Publisher
Springer US
Published in
Experimental Mechanics / Issue 8/2013
Print ISSN: 0014-4851
Electronic ISSN: 1741-2765
DOI
https://doi.org/10.1007/s11340-013-9735-4

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