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TECHNICAL PAPERS

Measurement of Local Creep Deformation in Cross-Weld Specimen by Optical Fiber Marking and Remote Monitoring

[+] Author and Article Information
Shan-Tung Tu, Jian-Ming Gong, Xiang Ling

Department of Mechanical Engineering, Nanjing University of Technology, Nanjing 210009, China

Xiao-Yuan He

Department of Civil Engineering, Southeast University, Nanjing 210096, China

J. Pressure Vessel Technol 124(1), 54-58 (Aug 02, 2001) (5 pages) doi:10.1115/1.1425808 History: Received February 24, 2000; Revised August 02, 2001
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References

Tu,  S. T., and Sandstrom,  R., 1994, “Evaluation of Weldment Creep Strength Reduction Factors by Experimental and Numerical Simulation,” Int. J. Pressure Vessels Piping, 57, pp. 335–344.
ASTM, 1997, “Standard Test Method for Conducting Creep, Creep-Rupture, and Stress-Rupture Tests of Metallic Materials,” ASTM Standard, E 139–96.
Tu,  S.-T., Gong,  J.-M., and Ling,  X., 1999, “Mechanical Behavior of Laboratory Cross-Weld Specimen and its Relation with the Practical Cases at Elevated Temperature,” Acta Metall. Sin., 12, pp. 82–88.
Xie, H.-M., and Dai, F.-L., 1994, “Experimental Study of Moiré Method in Application to the Measurement of Metal Creep,” (in Chinese), Mechanical Strength, 16, No. 4, pp. 27–30.
Kishimoto, K., and Shinya, N., 1995, “Electron Moiré Method for Measurement of High Temperature Deformation,” Proc. 2nd Japan-Sino Bilateral Symposium on High Temperature Strength of Materials, Nagaoka, Japan, pp. 71–76.
Gong, J. M., 1999, “Research on the Structural Integrity of Weldments at High Temperature,” Ph.D. dissertation, Nanjing University of Chemical Technology, Nanjing.
Gonzalez, R. C., and Wintz, P., 1977, Digital Image Processing, First Edition, Addison-Wesley Publishing Company, MA.
Storesund,  J., and Tu,  S. T., 1995, “Geometrical Effect on Creep in Cross-weld Specimens,” Int. J. Pressure Vessels Piping, 62, pp. 179–193.
Laha,  K., Bhanu Sankara,  R., and Mannan,  S. L., 1990, “Creep Behavior of Post-Weld Heat-Treatment 2.25Cr-1Mo Ferritic Steel: Base, Weld Metal and Weldments,” Mater. Sci. Eng., A, 129, pp. 183–195.
Gong,  J. M., Tu,  S. T., and Ling,  X., 2000, “Research of Welding Effect on Creep Damage of High Temperature Furnace Tubes,” Key Eng. Mater., 171–174, pp. 189–196.

Figures

Grahic Jump Location
Light transmission in an optical fiber
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Region definition in an image
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Sketch of measuring system of local creep deformation
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Arrangement of Optical Fibers in 1Cr0.5Mo cross-weld specimen
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Creep curves of base metal
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Creep curves of weld metal
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Minimum creep strain rates versus applied stress
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Strain distribution across 1Cr0.5Mo weldment at 145 MPa
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Strain distribution across 1Cr0.5Mo weldment at 110 MPa
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Optical fiber arrangement in HK-40 cross-weld specimen
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Creep curves for weld metal of cross weld specimens

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