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TECHNICAL PAPERS

Ultrasonic Stress Measurement and Material Characterization in Pressure Vessels, Piping, and Welds

[+] Author and Article Information
Don E. Bray

Don E. Bray, Inc., College Station, TX 77842-0315e-mail: debray@brayengr.com

J. Pressure Vessel Technol 124(3), 326-335 (Jul 26, 2002) (10 pages) doi:10.1115/1.1480825 History: Received October 09, 2000; Revised March 29, 2002; Online July 26, 2002
Copyright © 2002 by ASME
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References

Figures

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Pressure tank fitted with strain gages and frame for taking LCR data
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Longitudinal wave speeds in longitudinal (width) direction of .5 in. (12.7 mm) wall thickness, 1 in. (25.4 mm) wide ring cut from 12-in. (305-mm)-dia pipe steel
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LCR probe and frame on pressure vessel
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Circumferential LCR arrival at probe 1 on pressure vessel
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Expected thick wall cylinder tangential (hoop) stress distributions across wall of pressurized pipe. LCR probe positions T—transmitter, R1—first receiver, and R2 second receiver. LCR travel-times at 0 deg position for pressurized vessel.
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Circumferential LCR travel times at 0 deg position at midpoint of pressurized vessel
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Circumferential LCR travel times at 0 deg position at midpoint of vessel for 4 ksi wall stress and higher
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Circumferential LCR travel times at 270-deg position midpoint on vessel length—probe not removed and replaced
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LCR probe and frame in vicinity of weld
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Circumferential LCR travel-times approaching the weld
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LCR data collecting system
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Typical LCR arrival in steel, freq.=5 MHz. X indicates second positive zero crossing.

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