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Research Papers: Design and Analysis

Study on Dimensional Tolerances Required for Miniature C(T) Specimens

[+] Author and Article Information
Naoki Miura

Materials Science Research Laboratory,
Central Research Institute of
Electric Power Industry,
2-6-1 Nagasaka,
Yokosuka-shi, Kanagawa 240-0196, Japan
e-mail: miura@criepi.denken.or.jp

Yasunori Momoi

Materials Science Research Laboratory,
Central Research Institute of
Electric Power Industry,
2-6-1 Nagasaka,
Yokosuka-shi, Kanagawa 240-0196, Japan
e-mail: momoi@criepi.denken.or.jp

Masato Yamamoto

Materials Science Research Laboratory,
Central Research Institute of
Electric Power Industry,
2-6-1 Nagasaka,
Yokosuka-shi, Kanagawa 240-0196, Japan
e-mail: masatoy@criepi.denken.or.jp

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received February 18, 2016; final manuscript received August 17, 2016; published online September 28, 2016. Assoc. Editor: Yun-Jae Kim.

J. Pressure Vessel Technol 139(2), 021207 (Sep 28, 2016) (8 pages) Paper No: PVT-16-1024; doi: 10.1115/1.4034583 History: Received February 18, 2016; Revised August 17, 2016

The Master Curve approach using miniature C(T) specimens with 4 mm thickness is promising for directly determining the reference temperature of reactor pressure vessel (RPV) steels because they can be taken from the broken halves of the Charpy specimens used in the surveillance program to monitor neutron irradiation embrittlement. The relative dimensional tolerances of standard C(T) specimens are provided in the present ASTM E1921 standard; consequently, the absolute dimensional tolerances are stricter for smaller specimens. In this study, the effect of the tolerances of key dimensions on the elastic–plastic equivalent stress intensity factor derived from the J-integral, KJ, was calculated using three-dimensional finite-element analysis. Even if the dimensional tolerances for the miniature C(T) specimens based on the present standard were mitigated in some degree (as examples, the tolerance of specimen thickness of ±0.08 mm was mitigated to ±0.1 mm; and the tolerance of specimen width of ±0.04 mm was mitigated to ±0.1 mm), the variations of KJ and the reference temperature were negligibly small. Furthermore, the use of the mitigated dimensional tolerances with adequate accuracy for evaluating the fracture toughness was ascertained.

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References

Miura, N. , and Soneda, N. , 2012, “ Evaluation of Fracture Toughness by Master Curve Approach Using Miniature C(T) Specimens,” ASME J. Pressure Vessel Technol., 134(2), p. 021402. [CrossRef]
Yoshimoto, K. , Hirota, T. , Sakamoto, H. , Sugihara, T. , Sakaguchi, S. , and Oumaya, T. , 2013, “ Applicability of Miniature C(T) Specimen to Evaluation of Fracture Toughness for Reactor Pressure Vessel Steel,” ASME Paper No. PVP2013-97840.
Tobita, T. , Nishiyama, Y. , Ohtsu, T. , Udagawa, M. , Katsuyama, J. , and Onizawa, K. , 2013, “ Fracture Toughness Evaluation of Reactor Pressure Vessel Steels by Master Curve Method Using MiniCT Specimens,” ASME Paper No. PVP2013-97897.
Yamamoto, M. , Kimura, A. , Onizawa, K. , Yoshimoto, K. , Ogawa, T. , Chiba, A. , Hirano, T. , Sugihara, T. , Sugiyama, M. , Miura, N. , and Soneda, N. , 2012, “ A Round Robin Program of Master Curve Evaluation Using Miniature C(T) Specimens—First Round Robin Test on Uniform Specimens of Reactor Pressure Vessel Material,” ASME Paper No. PVP2012-78661.
Yamamoto, M. , Onizawa, K. , Yoshimoto, K. , Ogawa, T. , Mabuchi, Y. , and Miura, N. , 2013, “ A Round Robin Program of Master Curve Evaluation Using Miniature C(T) Specimens—2nd Report: Fracture Toughness Comparison in Specified Loading Rate Condition,” ASME Paper No. PVP2013-97936.
Yamamoto, M. , Kimura, K. , Onizawa, K. , Yoshimoto, K. , Ogawa, T. , Mabuchi, Y. , Viehrig, H. W. , Miura, N. , and Soneda, N. , 2014, “ A Round Robin Program of Master Curve Evaluation Using Miniature C(T) Specimens—3rd Report: Comparison of To Under Various Selections of Temperature Conditions,” ASME Paper No. PVP2014-28898.
Yamamoto, M. , Onizawa, K. , Yoshimoto, K. , Ogawa, T. , Mabuchi, Y. , Valo, M. , Lambrecht, M. , Viehrig, H. W. , Miura, N. , and Soneda, N. , 2014, “ International Round Robin Test on Master Curve Reference Temperature Evaluation Utilizing Miniature C(T) Specimen,” ASTM International, West Conshohocken, PA, Standard No. STP 1576.
ASTM International, 2013, “ Standard Test Method for Determination of Reference Temperature, To, for Ferritic Steels in the Transition Range,” ASTM International, West Conshohocken, PA, Standard No. ASTM E1921-13.
Japan Electric Association, 2011, “ Test Method for Determination of Reference Temperature, To, of Ferritic Steels,” Japan Electric Association, Tokyo, Japan, Standard No. JEAC 4216-2011.
Miura, N. , Momoi, Y. , and Yamamoto, M. , 2015, “ Relation Between Front-Face and Load-Line Displacements on a C(T) Specimen by Elastic-Plastic Analysis,” ASME Paper No. PVP2015-45499.
Miura, N. , Soneda, N. , Sawai, S. , and Sakai, S. , 2009, “ Proposal of Rational Determination of Fracture Toughness Lower-Bound Curves by Master Curve Approach,” ASME Paper No. PVP2009-77360.

Figures

Grahic Jump Location
Fig. 4

Relation between load and front-face displacement

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Fig. 5

Transition of normalized KJ

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Fig. 7

Effect of the notch width on normalized KJ

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Fig. 3

Finite-element model (for case “Std”)

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Fig. 2

Dimensions of a miniature C(T) specimen

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Fig. 1

Example of recommended compact specimen designs [8]

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Fig. 6

Effect of different dimensions on normalized KJ, including (a) crack length, (b) specimen thickness, (c) specimen width, (d) specimen length, (e) specimen height, and (f) gauge length

Grahic Jump Location
Fig. 8

Effect of different dimensions on the contribution fraction, including (a) crack length, (b) specimen thickness, (c) specimen width, (d) specimen length, (e) specimen height, (f) gauge length, and (g) notch width

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