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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Grahic Jump Location
Circumferential LCR arrival at probe 1 on pressure vessel
Grahic Jump Location
LCR data collecting system
Grahic Jump Location
Typical LCR arrival in steel, freq.=5 MHz. X indicates second positive zero crossing.
Grahic Jump Location
Pressure tank fitted with strain gages and frame for taking LCR data
Grahic Jump Location
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
Grahic Jump Location
LCR probe and frame on pressure vessel
Grahic Jump Location
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.
Grahic Jump Location
Circumferential LCR travel times at 0 deg position at midpoint of pressurized vessel
Grahic Jump Location
Circumferential LCR travel times at 0 deg position at midpoint of vessel for 4 ksi wall stress and higher
Grahic Jump Location
Circumferential LCR travel times at 270-deg position midpoint on vessel length—probe not removed and replaced
Grahic Jump Location
LCR probe and frame in vicinity of weld
Grahic Jump Location
Circumferential LCR travel-times approaching the weld



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