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TECHNICAL PAPERS

EMAT-Based Inspection of Concrete-Filled Steel Pipes for Internal Voids and Inclusions

[+] Author and Article Information
Won-Bae Na

Bridge Group, Arizona Department of Transportation, Phoenix, AZ 85007

Tribikram Kundu

ASME Fellow, Department of Civil Engineering and Engineering Mechanics, The University of Arizona, Tucson, AZ 85721e-mail: tkundu@email.arizona.edu

J. Pressure Vessel Technol 124(3), 265-272 (Jul 26, 2002) (8 pages) doi:10.1115/1.1491271 History: Received April 17, 2002; Online July 26, 2002
Copyright © 2002 by ASME
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References

Figures

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Photographs of EMATs: (a) transmitter, and (b) receiver
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Geometries of five different specimens: (a) no void or 0% void, (b) void length is 25%, (c) void length is 50%, (d) void length is 75%, and (e) hollow steel pipe
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The experimental setup using EMATs (electro-magnetic acoustic transducers)
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Different transmitter and receiver positions on void-free specimen
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Four different paths for the propagating wave
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Time history curves of void-free specimen for transmitter-receiver position: (a) a-g, (b) a-e, (c) a-d, (d) b-d, and (e) c-d
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Time history curves of (a) void-free, (b) 25% void length, (c) 50% void length, and (d) 75% void length specimens. The voids are located in the top part of the specimen cross section as shown.
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Time history curves of the hollow steel pipe
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Time history curves of (a) 25% void length, (b) 50% void length, and (c) 75% void length specimens. The voids are located in the bottom part of the specimen cross section as shown.
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Time history curves for (a) 25% inclusion length, (b) 50% inclusion length, and (c) 75% inclusion length specimens. Inclusions are located in the top part of the specimen cross section as shown.
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Time history curves for (a) 25% inclusion length, (b) 50% inclusion length, and (c) 75% inclusion length specimens. Inclusions are located in the bottom part of the specimen cross section as shown.
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Group velocity dispersion curves of the steel pipe. Material properties are given in the text. The solid square corresponds to F(1,1) and L(0,1) mode and the solid circle corresponds to the L(0,2) mode. Here, F(1,1) and L(0,1) are identical in the frequency range of interest.
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Time history curves of the fast wave modes shown in Fig. 8. This time history plot shows direct arrivals of L(0,2) and F(1,2) modes and arrivals of the same modes after being reflected at the pipe boundaries.

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