Normal and Transverse Displacement Interferometers Applied to Small Diameter Kolsky Bars |
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Authors: | DT Casem SE Grunschel BE Schuster |
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Institution: | (1) US Army Research Laboratory, RDRL-WMP-B, Aberdeen Proving Ground, Aberdeen, MD 21005-5069, USA;(2) Oak Ridge Institute for Science and Education, Oak Ridge, TN, USA;(3) US Army Research Laboratory, RDRL-WML-H, Aberdeen Proving Ground, Aberdeen, MD 21005-5069, USA |
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Abstract: | For Kolsky bar testing beyond strain-rates of 10,000/s, it is useful to employ bars with diameters of only a few millimeters
or less. Furthermore, very small (sub-millimeter) systems are compatible with micron-sized specimens, to be used, for example,
for the determination of mesoscale properties. However, at these sizes, traditional strain-gage measurements of the longitudinal
waves within the bars become impractical. In this paper we describe the application of optical measurement techniques to two
Kolsky bars, with 3.2 and 1.6 mm diameters. A transverse displacement interferometer is used to measure the displacement of
the mid-point of the incident bar and provide measurements of the incident and reflected pulses. Similarly, a normal displacement
interferometer is used to measure the displacement of the free-end of the transmitter bar and provide a measurement of the
transmitted pulse. The new methods are used to characterize the behavior of 6061-T6 aluminum at rates greater than 100,000/s.
The feasibility of application to smaller bars is also discussed. |
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