This study investigates the interaction effect of multiple-axial part-through-wall (PTW) flaws on the failure behavior of Alloy 690TT steam generator (SG) tubes. Burst tests of tubes with single and multiple flaws were conducted at room temperature (RT). The flaws were made by the electrodischarge machining (EDM) method on the outer surface of the specimens. Six different configurations of multiple flaws were considered to see the interaction effect; two and three collinear, two and three parallel, and two and three nonaligned flaws. In all cases, an axial flaw with a constant depth of 50% wall-thickness was considered, and the following variables were systematically varied; the axial and/or circumferential separating ligament lengths between flaws, the flaw length, and the number of flaws. Effects of these variables on the failure pressure and failure mode were investigated based on experimental data. The effects of separating ligament lengths and flaw lengths on the failure pressure were dependent on the type of flaw configuration. For collinear and nonaligned flaws, the decrease in failure pressure by the interaction of multiple flaws became significant as the number of flaws increased. The failure mode of multiple flaws was strongly dependent on the length of the flaws.
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April 2016
Research-Article
Failure Behavior of Multiple-Axial Part-Through-Wall Flaws in Alloy 690TT Steam Generator Tubes
Ki Hyeon Eom,
Ki Hyeon Eom
Department of Nuclear Engineering,
Chosun University,
309 Pilmun-daero,
Dong-Gu, Gwangju 61452, South Korea
Chosun University,
309 Pilmun-daero,
Dong-Gu, Gwangju 61452, South Korea
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Jin Weon Kim,
Jin Weon Kim
Department of Nuclear Engineering,
Chosun University,
309 Pilmun-daero,
Dong-Gu, Gwangju 61452, South Korea
e-mail: jwkim@chosun.ac.kr
Chosun University,
309 Pilmun-daero,
Dong-Gu, Gwangju 61452, South Korea
e-mail: jwkim@chosun.ac.kr
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Yun Jae Kim,
Yun Jae Kim
Department of Mechanical Engineering,
Korea University,
145 Anam-ro,
Seongbuk-Ku, Seoul 136-701, South Korea
Korea University,
145 Anam-ro,
Seongbuk-Ku, Seoul 136-701, South Korea
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Jong Sung Kim
Jong Sung Kim
Department of Mechanical Engineering,
Sunchon National University,
255 Jungang-ro,
Suncheon, Jeollanam-do 540-950, South Korea
Sunchon National University,
255 Jungang-ro,
Suncheon, Jeollanam-do 540-950, South Korea
Search for other works by this author on:
Ki Hyeon Eom
Department of Nuclear Engineering,
Chosun University,
309 Pilmun-daero,
Dong-Gu, Gwangju 61452, South Korea
Chosun University,
309 Pilmun-daero,
Dong-Gu, Gwangju 61452, South Korea
Jin Weon Kim
Department of Nuclear Engineering,
Chosun University,
309 Pilmun-daero,
Dong-Gu, Gwangju 61452, South Korea
e-mail: jwkim@chosun.ac.kr
Chosun University,
309 Pilmun-daero,
Dong-Gu, Gwangju 61452, South Korea
e-mail: jwkim@chosun.ac.kr
Yun Jae Kim
Department of Mechanical Engineering,
Korea University,
145 Anam-ro,
Seongbuk-Ku, Seoul 136-701, South Korea
Korea University,
145 Anam-ro,
Seongbuk-Ku, Seoul 136-701, South Korea
Jong Sung Kim
Department of Mechanical Engineering,
Sunchon National University,
255 Jungang-ro,
Suncheon, Jeollanam-do 540-950, South Korea
Sunchon National University,
255 Jungang-ro,
Suncheon, Jeollanam-do 540-950, South Korea
1Corresponding author.
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 2, 2015; final manuscript received September 5, 2015; published online November 19, 2015. Assoc. Editor: Haofeng Chen.
J. Pressure Vessel Technol. Apr 2016, 138(2): 021406 (10 pages)
Published Online: November 19, 2015
Article history
Received:
August 2, 2015
Revised:
September 5, 2015
Citation
Hyeon Eom, K., Weon Kim, J., Jae Kim, Y., and Sung Kim, J. (November 19, 2015). "Failure Behavior of Multiple-Axial Part-Through-Wall Flaws in Alloy 690TT Steam Generator Tubes." ASME. J. Pressure Vessel Technol. April 2016; 138(2): 021406. https://doi.org/10.1115/1.4031663
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