A pressure vessel has been constructed for demonstrating the ultrasonic technique for indicating changes in wall and weld stress. A special contoured probe was designed and constructed, and the pressure vessel was fitted with strain gauges for monitoring the wall stress. At low wall stresses, below 4 ksi (26 MPa), the ultrasonic data showed considerable scatter. There is similar scatter in the zero pressure travel-times at individual locations around the vessel. At wall stresses of 4 ksi (26 MPa) and above, however, there is an almost linear relationship of stress and travel-time change. Measurements adjacent to an end weld also showed very good trends. Plots of travel times approaching a weld predict −27.5 ksi (−190 MPa) at 1 in. (25 mm) from the weld, compared to zero stress at 5.6 in. (142 mm) away from the weld. These results are consistent with results obtained by others on a similar weld using the blind hole drilling method.
Ultrasonic Stress Measurement and Material Characterization in Pressure Vessels, Piping, and Welds
Contributed by the Pressure Vessels and Piping Division and presented at the Pressure Vessels and Piping Conference, Atlanta, Georgia, July 22–26, 2001, of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS. Manuscript received by the PVP Division, October 9, 2000; revised manuscript received March 29, 2002. Associate Editor: J. C. Duke.
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Bray, D. E. (July 26, 2002). "Ultrasonic Stress Measurement and Material Characterization in Pressure Vessels, Piping, and Welds ." ASME. J. Pressure Vessel Technol. August 2002; 124(3): 326–335. https://doi.org/10.1115/1.1480825
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