Creep deformation localization is a common occurrence generally found in high temperature components, typically at weldments and geometrical discontinuities. The deformation in a small region cannot be measured by a conventional displacement gage. A new technique for measuring long-term local creep deformation was developed. It uses quartz optical fiber marking, remote monitoring, and image processing. Long-term measurements of the creep deformations of base metal, weld metal, and heat-affected zone in cross-weld specimens were performed at high temperature, which verify the new technique. Strain distributions and evolutions in the weldments are obtained.
Measurement of Local Creep Deformation in Cross-Weld Specimen by Optical Fiber Marking and Remote Monitoring
Contributed by the Pressure Vessels and Piping Division for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received by the PVP Division, February 24, 2000; revised manuscript received August 2, 2001. Associate Editor: J. C. Duke.
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Tu, S., Gong , J., Ling, X., and He, X. (August 2, 2001). "Measurement of Local Creep Deformation in Cross-Weld Specimen by Optical Fiber Marking and Remote Monitoring ." ASME. J. Pressure Vessel Technol. February 2002; 124(1): 54–58. https://doi.org/10.1115/1.1425808
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