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TECHNICAL PAPERS

Shallow Flaws Under Biaxial Loading Conditions—Part I: The Effect of Specimen Size on Fracture Toughness Values Obtained From Large-Scale Cruciform Specimens

[+] Author and Article Information
Wallace J. McAfee, B. Richard Bass, Paul T. Williams

Oak Ridge National Laboratory, Oak Ridge, TN 37831e-mail: w2m@ornl.gov

J. Pressure Vessel Technol 123(1), 10-24 (Oct 23, 2000) (15 pages) doi:10.1115/1.1343910 History: Received January 01, 2000; Revised October 23, 2000
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References

Figures

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PTS loading produces biaxial stress in an RPV wall with one of the principal stresses aligned parallel with the tip of the constant-depth shallow-surface flaw
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Conceptual features of the cruciform shallow-flaw biaxial fracture toughness test specimen
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Results for validation matrix tests of high-yield strength material showing dependence of fracture toughness on temperature and biaxial loading
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Biaxial loading effects on shallow-flaw fracture toughness of high-yield strength A 533 B steel showing reduction in toughness with increasing load ratio; test temperature=23°F(−5°C)
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Comparison of Charpy curves from heat-treated Plate 14 material with that from irradiated 73W material
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Tensile properties of heat-treated Plate 14 over temperature range −22°F (−30°C) to 140°F (60°C)
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Tensile properties of heat-treated Plate 14 are relatively independent of location through plate thickness [test temperature=RTNDT=104°F(40°C)]
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Master curve generated using fracture toughness data from 1/2T compact tension specimens tested at −22°F (−30°C); heat-treated Plate 14 material
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Master curve generated using fracture toughness data from 1/2T compact tension specimens tested at −202°F≤T≤70°F(−130°C≤T≤21°C); heat-treated Plate 14 material
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Plate cut-up plan for large-scale cruciform beam specimen blanks showing locations relative to intermediate-scale specimens (all dimensions in mm)
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Schematic of large-size cruciform beam EB weld development block
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Schematic of EB weld demonstration assembly
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General setup for EB welding large-size cruciform specimens
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Cross section of bead-on-plate EB welds make to develop parameters for large-scale cruciform beams
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Comparison of intermediate-scale and large-scale cruciform beam test sections in uniaxial configuration
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Large-scale cruciform beam after completion of EB welding
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Comparison of calculated moment versus KJ for intermediate-size and large-size cruciform specimens under biaxial (1:1) loading showing impact of single, high toughness result from intermediate-size cruciform specimen
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Comparison of calculated moment versus KJ for original design and reduced thickness large-size cruciform specimens under biaxial (1:1) loading showing result of reducing test section thickness
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Large-scale, 2-D flaw cruciform specimen showing details of reduced test section
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Large-scale PLS1 mounted in test fixture before testing
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Measured CMOD for failure test of shallow-flaw, large-scale cruciform Specimen PLS1: load ratio=1:1, test temperature=28.4°F (−2°C)
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Measured CMOD for failure test of shallow-flaw, large-scale cruciform Specimen PLS2: load ratio=1:1, test temperature=31.6°F (0°C)
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Measured CMOD for failure test shallow-flaw, large-scale cruciform Specimen PLS3: load ratio=1:1, test temperature=33.2°F (0.7°C)
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Measured CMOD for failure test of shallow-flaw, large-scale cruciform Specimen PLS4: load ratio=1:1, test temperature=31.2°F (−0.5°C)
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Comparison of measured centerline CMOD for failure test of shallow-flaw, large-scale cruciform specimens
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Test section of shallow-flaw, large-scale cruciform Specimen PLS1 after failure
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Initial loading segment of measured CMOD for failure test of shallow-flaw, large-scale cruciform Specimen PLS2: load ratio=1:1, test temperature 31.6°F (0°C)
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Fracture surface for large-scale 2-D flaw cruciform specimen PLS-1
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Fracture surface for large-scale 2-D flaw cruciform specimen PLS-2
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Fracture surface for large-scale 2-D cruciform specimen PLS-3
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Fracture surface for large-scale 2-D flaw cruciform specimen PLS-4
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Finite element model used for analysis of large-scale 2-D flaw cruciform fracture sprecimens
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Finite element analysis results comparing applied moment-predicted CMOD for large-scale 2-D flaw cruciform specimens with different test section configurations under biaxial (1:1) loading
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Finite element analysis results showing development of K at flaw center for large-scale 2-D flaw cruciform specimens with different test section configurations under biaxial (1:1) loading
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Typical load-CMOD trace for large-scale 2-D flaw cruciform specimen tests showing bilinear characteristic of initial loading curve
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Finite element model of test section showing method for applying residual stress
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Finite-element model of test section showing method for applying residual stress
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Comparison of applied moment versus CMOD results from finite element analysis including effects of residual stress with experimental measurements from large-scale 2-D flaw cruciform specimens under biaxial (1:1) loading
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Results from large-scale (5.5-in. (140-mm) thick) 2-D flaw cruciform specimens show reduced toughness compared to intermediate-scale specimens (4-in. (102-mm) thick); large-scale specimen results have been offset to PT/PL=1.05
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The effect of biaxial loading on large-scale cruciform specimens of the heat treated Plate 14 material is to reduce the slope of the fracture toughness curve through the lower transition temperature region
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Comparison of intermediate-scale size-adjusted biaxial data with large-scale biaxial data and 1/2T C(T) data. All results are for heat-treated Plate 14 material tested in the range of −5°C to 0°C.

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