Research Papers: Materials and Fabrication

Use of Master Curve Technology for Assessing Shallow Flaws in a Reactor Pressure Vessel Material

[+] Author and Article Information
N. Taylor

 European Commission Joint Research Centre, P.O. Box 2, 1755 ZG Petten, The Netherlandsnigel.taylor@ec.europa.eu

P. Minnebo

 European Commission Joint Research Centre, P.O. Box 2, 1755 ZG Petten, The Netherlandsphilip.minnebo@jrc.nl

B. R. Bass

 Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6085bassbr@ornl.gov

D. Siegele

 Fraunhofer-Institut für Werkstoffmechanik, Woehlerstrasse 1, 79108 Freiburg, Germanydieter.siegele@iwm.fraunhofer.de

K. Wallin

 VTT, Kemistintie 3, FI-02044 Espoo, Finlandkim.wallin@vtt.fi

M. Kytka

 NRI Rez plc, Husinec-Rez, No. 130, 250 68 Rez, Czech Republickyt@ujv.cz

J. Wintle

 TWI Ltd., Granta Park, Great Abington CB1 6AL, UKjohn.wintle@twi.co.uk

These data have provided a basis for application of local approach methods in NESC-IV, as described in Ref. 12.

J. Pressure Vessel Technol 130(3), 031407 (Jul 23, 2008) (11 pages) doi:10.1115/1.2937742 History: Received September 01, 2006; Revised February 20, 2007; Published July 23, 2008

In the NESC-IV project, an experimental/analytical program was performed to develop validated analysis methods for transferring fracture toughness data to shallow flaws in reactor pressure vessels subject to biaxial loading in the lower-transition temperature region. Within this scope, an extensive range of fracture tests was performed on material removed from a production-quality reactor pressure vessel. The master curve analysis of these data is reported and its application to the assessment of the project feature tests on large beam test pieces is discussed.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 1

Fit of the master curve to the high constraint fracture data for PVRUF weld, Plate 100, and Plate 200

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Figure 2

Fit of the master curve to the low constraint fracture data for PVRUF weld and Plate 100 materials (the specimen geometry is SE(B) with a nominal a∕W of 0.1 for all the tests)

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Figure 5

Schematic of the testing arrangement for the NESC-IV biaxial tests on PVRUF weld showing (a) the test piece and its dimensions and (b) detail of the inserted defect (after fracture)

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Figure 6

Values of Kj,max from the biaxial feature tests on the weld compared with the RTNDT and TT0 reference curves

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Figure 8

Schematic of the NESC-IV embedded flaw feature tests on PVRUF Plate 200 material showing (a) the overall beam geometry and loading arrangement and (b) detail of the implanted through-thickness subsurface flaw

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Figure 3

Fit of the master curve to the restricted set of Plate 100 low constraint fracture data using the T0 value of −120.4°C determined from the data shown

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Figure 4

Low constraint fracture toughness data for the weld material, from tests on SE(B) specimens taken from Blocks 3.3 and 4.3 (master curve T0=−133°C)

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Figure 7

Biaxial tests: predicted values of maximum KJ, i.e., at the HAZ, compared with the standard master curve N.B. The error bars on the KJ values correspond to the standard deviation of the values calculated by different organizations participating in the NESC-IV project fracture analyses.

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Figure 9

Average values of KJ at fracture (size corrected to B=25mm) compared with the master curve (5%, 50%, and 95%) N.B. (The error bars on the KJ values correspond to the standard deviation of the calculated values from different organizations participating in the post-test fracture analyses.)




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