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TECHNICAL PAPERS

Stress Analyses and Geometry Effects During Cyclic Loading Using Thermography

[+] Author and Article Information
B. Yang, P. K. Liaw, D. E. Fielden

Materials Science and Engineering Department, The University of Tennessee, Knoxville, TN 37996-2200

J. Y. Huang, R. C. Kuo

Institute of Nuclear Energy Research (INER), P.O. Box 3-14, 1000 Wenhua Road, Chiaan Village, Lungtan, Taiwan 325, Republic of China

J. G. Huang

Taiwan Power Company, Taipei, Taiwan

J. Eng. Mater. Technol 127(1), 75-82 (Feb 22, 2005) (8 pages) doi:10.1115/1.1836793 History: Received January 01, 2003; Revised September 14, 2004; Online February 22, 2005
Copyright © 2005 by ASME
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References

Figures

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(a) RPV steel cylindrical specimen geometry for high-cycle fatigue testing; (b) RPV steel plate specimen geometry for high-cycle fatigue testing
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Temperature evolution on the gauge-length section of the cylindrical specimen of SA533B1 steel at the 25th cycle of 20 Hz fatigue testing, σmax=640 MPa
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(a) A thermograph of the cylindrical fatigue specimen of SA533B1 steel during 20 Hz fatigue testing, σmax=650 MPa, taken at the 20th fatigue cycle; (b) Temperature evolutions at the center of the specimen as a function of stress, taken at an IR camera speed of 120 Hz.
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Stress versus strain result of RPV steel tested at 20 Hz, σmax=640 MPa
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Temperature evolutions at the center of the specimen as a function of stress, taken at an IR camera speed of 120 Hz
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Experimental and calculated maximum stress levels of cylindrical specimens during 20 Hz fatigue testing, R=0.2
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Temperature evolutions at the center of the flat specimens during 10 Hz fatigue tests with a maximum stress level of 680 MPa and an R ratio of 0.1, taken at an IR camera speed of 60 Hz
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(a) The thermographs of the cylindrical sample at the 5th cycle of 20 Hz fatigue tests with a maximum stress level of 640 MPa and an R ratio of 0.2, taken at an IR camera speed of 120 Hz; (b) The thermographs of the flat sample at the 5th cycle of 10 Hz fatigue tests with a maximum stress level of 680 MPa and an R ratio of 0.1, taken at an IR camera speed of 60 Hz.
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A flat specimen with two Lüders bands during 10 Hz fatigue testing with a maximum stress level of 680 MPa and an R ratio of 0.1, taken at an IR camera speed of 60 Hz
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Conversion from the temperature map to heat-dissipation-rate (HDR) map, taken at a IR camera speed of 60 Hz
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(a) Thermographs of Lüders-band evolution from the 5th to 30th fatigue cycles, 10 Hz, R=0.1, taken at an IR camera speed of 60 Hz; (b) Heat-dissipation-rate (HDR) maps of Lüders-band evolution from the 5th to 30th fatigue cycle, 10 Hz, R=0.1, taken at an IR camera speed of 60 Hz.
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Measured HDR peak-position change along the specimen-gauge-length section during the Lüders-band evolution of 10 Hz fatigue tests with a maximum stress level of 680 MPa and an R ratio of 0.1
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(a) Inelastic strain evolution of the flat specimen during the first 50 cycles of 10 Hz fatigue test at a maximum stress level of 680 MPa and an R ratio of 0.1; (b) Inelastic strain evolution of the flat specimen from the 5th to 27th cycles of 10 Hz fatigue test at a maximum stress level of 680 MPa and an R ratio of 0.1.
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Inelastic strain evolution of the cylindrical specimen during the first 30 cycles of 20 Hz fatigue test at a maximum stress level of 640 MPa and an R ratio of 0.2

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