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Research Papers: Materials and Fabrication

Failure Behavior of Multiple-Axial Part-Through-Wall Flaws in Alloy 690TT Steam Generator Tubes

[+] Author and Article Information
Ki Hyeon Eom

Department of Nuclear Engineering,
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

Yun Jae Kim

Department of Mechanical Engineering,
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

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 138(2), 021406 (Nov 19, 2015) (10 pages) Paper No: PVT-15-1175; doi: 10.1115/1.4031663 History: Received August 02, 2015; Revised September 05, 2015

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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Figures

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Fig. 1

SG tube specimens used for the experiment: (a) dimensions of SG tube specimen and (b) configurations of multiple PTW flaws

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Fig. 2

Schematic diagram of test apparatus

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Fig. 3

A sample of pressure versus time data for a SG tube specimen with multiple-axial PTW flaws

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Fig. 4

Normalized failure pressures of SG tube specimens with a single-axial PTW flaw

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Fig. 5

Normalized failure pressures of SG tube specimens with collinear axial multiple PTW flaws

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Fig. 6

Normalized failure pressures of SG tube specimens with parallel multiple-axial PTW flaws

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Fig. 7

Normalized failure pressures of SG tube specimens with nonaligned multiple-axial PTW flaws

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Fig. 8

Effect of number of multiple-axial PTW flaws on the failure pressures of SG tube specimens: (a) collinear flaws and (b) nonaligned flaws

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Fig. 9

Post-test photographs of SG tube specimens with a single-axial PTW flaw

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Fig. 10

Post-test photographs of SG tube specimens with collinear and nonaligned multiple-axial PTW flaws: (a) collinear flaws and (b) nonaligned flaws

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Fig. 11

Post-test photographs of SG tube specimens with parallel multiple-axial PTW flaws

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