An <Emphasis Type="Italic">In Situ</Emphasis> Ultrasonic Technique for Simultaneous Measurement of Longitudinal and Shear Wave Speeds in Solids |
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Authors: | T H Kidd S Zhuang G Ravichandran |
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Institution: | (1) Graduate Aeronautics Laboratories, California Institute of Technology, Pasadena, CA 91125, USA |
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Abstract: | Ultrasonic wave speed measurements are widely used to infer the elastic properties of solids. In the standard method, longitudinal
and shear transducers are used separately to measure the corresponding wave speeds in a material. A new experimental method
is introduced for simultaneously measuring the longitudinal and the shear wave speeds using a single set of longitudinal or
shear transducers. The method can also be used to measure the wave speeds in situ during deformation by placing the transducers along the loading axis. The transducers are housed in a specially designed
fixture such that they are not subjected to loading. The technique is demonstrated by performing uniaxial compression experiments
on fully dense isotropic solids (where the wave speeds are not expected to change during deformation) and in polymeric foams
(where the wave speeds are affected by damage). |
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Keywords: | Ultrasonics Wave speeds Elastic constants Deformation Damage |
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