Research Papers: Materials and Fabrication

Experimental and Analytical Studies on the Effect of Excessive Loading on Fatigue Crack Propagation in Piping Materials

[+] Author and Article Information
Kunio Onizawa

Nuclear Safety Research Center,
Japan Atomic Energy Agency,
Tokai, Ibaraki 319-1195, Japan

Yinsheng Li

Japan Nuclear Energy Safety Organization,
Minato-ku, Tokyo 105-0001, Japan

Genki Yagawa

Center for Computational Mechanics Research,
Toyo University,
Bunkyo-ku, Tokyo 112-0001, Japan

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the Journal of Pressure Vessel Technology. Manuscript received November 18, 2012; final manuscript received April 11, 2013; published online June 11, 2013. Assoc. Editor: Kunio Hasegawa.

J. Pressure Vessel Technol 135(4), 041406 (Jun 11, 2013) (9 pages) Paper No: PVT-12-1170; doi: 10.1115/1.4024454 History: Received November 18, 2012; Revised April 11, 2013

The seismic design review guide in Japan was revised in September 2006 to address the occurrence of a large earthquake beyond the design basis. In addition, Japanese nuclear power plants (NPPs) experienced multiple large earthquakes, such as Niigata-ken Chuetsu-Oki Earthquake in 2007 and the Great East Japan Earthquake in 2011. Therefore, it is very important to assess the structural integrity of reactor piping under such a large earthquake when a crack exists in the piping. In this work, crack growth behavior after excessive loading during the large-scale earthquake were experimentally and analytically evaluated for carbon steel and austenitic stainless steel. Some cyclic loading patterns with increasing and decreasing load amplitudes and maximum loads were applied to fatigue crack growth test specimens. From the results, the retardation of crack growth rate was clearly observed after excessive loading. In addition, the applicability to the retardation effect of the modified Wheeler model was confirmed. It is also concluded that the retardation effect has little influence on the failure probability due to seismic loading using probabilistic fracture mechanics (PFM) analyses with the modified Wheeler model.

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Fig. 1

Geometry of the CT specimen used in this study

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Fig. 2

Four loading conditions

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Fig. 3

FEM analysis model for CT specimens

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Fig. 4

Number of cycles versus crack length for Type 316 stainless steel, case 3: loading amplitude stepwise increase

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Fig. 5

Number of cycles versus crack length for Type 316 stainless steel, case 4: loading amplitude stepwise decrease

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Fig. 6

Typical behavior of crack growth subjected to amplitude decrease loading

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Fig. 7

Determination of retardation region using the ratio of retardation value method

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Fig. 8

Determination of retardation region using the crack growth rate as a function of crack length

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Fig. 9

Variation of retardation region related as a function of Kb − Ka (Type 316 stainless steel)

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Fig. 10

Schematic drawing of the relations among loading condition, plastic zone size and stress distribution during crack growth retardation

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Fig. 11

Variation of retardation region related as a function of Kb2-Ka2

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Fig. 12

Distribution of plastic strain obtain from FEM analysis

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Fig. 13

Procedure for the determination of LPEMAGmin

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Fig. 14

Variation of retardation region by FEM analysis as a function of Kb2-Ka2

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Fig. 15

Input seismic load wave and change in range of stress intensity factor

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Fig. 16

The result of one seismic loading on the deterministic analysis for Type 316 stainless steel

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Fig. 17

The result of one seismic loading on the deterministic analysis for STS410 carbon steel

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Fig. 18

The result of the PFM analysis for Type 316 stainless steel

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Fig. 19

The result of the PFM analysis for STS410 carbon steel



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