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Experimental Mechanics

Erschienen in:

01.10.2013

Kolsky Bar Wave Separation Using a Photon Doppler Velocimeter

verfasst von: D. T. Casem, M. B. Zellner

Erschienen in: Experimental Mechanics | Ausgabe 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.

Vorheriger Artikel Simultaneous Measurement of Plate Natural Frequencies and Vibration Mode Shapes Using ESPI

Nächster Artikel A Study on the Evaluation of the Fracture Process Zone in CCNBD Rock Samples

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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.

A strain gage is a Lagrangian measurement, but the PDV is Eulerian.

The authors have investigated other methods for measuring particle velocity for wave separation; see [25].

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Titel: Kolsky Bar Wave Separation Using a Photon Doppler Velocimeter
verfasst von: D. T. Casem
M. B. Zellner
Publikationsdatum: 01.10.2013
Verlag: Springer US
Erschienen in: Experimental Mechanics / Ausgabe 8/2013
Print ISSN: 0014-4851
Elektronische ISSN: 1741-2765
DOI: https://doi.org/10.1007/s11340-013-9735-4

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