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RESEARCH PAPER

A New Approach to Evaluate Fracture Toughness of Structural Materials

[+] Author and Article Information
J. A. Wang, K. C. Liu

Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37831

J. Pressure Vessel Technol 126(4), 534-540 (Dec 01, 2004) (7 pages) doi:10.1115/1.1804202 History: Received February 25, 2004; Revised July 23, 2004; Online December 01, 2004
Copyright © 2004 by ASME
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References

ASTM, 2004, “Test Method for Plane-Strain Fracture Toughness of Metallic Materials, ASTM E 399-90, ASTM International, Philadelphia, PA.”
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Lundin, C. D., 1986, “A Fundamental of Weld Discontinuities and Their Significance,” Welding Research Bulletin, No. 295.
Dolby, R. E., and Archer, G. L., May 1971, “The Assessment of Heat-Affected Zone Fracture Toughness,” Proceedings of the Practical Applications of Fracture Mechanics to Pressure Vessel Technology Conference.
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Wang,  J. A., Liu,  K. C., McCabe,  D. E., and David,  S. A., 2000, “Using Torsion Bar Testing to Determine Fracture Toughness, KIC,” Fatigue Fract. Eng. Mater. Struct., 23, pp. 45–56.
Wang, J. A., Liu, K. C., and McCabe, D. E., 2002, “An Innovative Technique for Measuring Fracture Toughness of Metallic and Ceramic Materials,” in Fatigue and Fracture Mechanics, 33 , W. G. Reuter and R. S. Piascik, eds., ASTM STP 1417, pp. 757–770.
Wang, J. A., Liu, K. C., and Joshi, G. A., 2002, “Using Torsion Bar Testing to Determine Fracture Toughness of Ceramic Materials,” ASME Proceedings of ETCE 2002 Conference on Composite Materials Design & Analysis, ASME, New York.
Wang, J. A., 2001, “TOR3D-KIC: A 3-D Finite Element Analysis Code for Determination of Fracture Toughness, KIC, for Spiral Notch Torsion Fracture Test (SNTT),” Oak Ridge National Laboratory Report ORNL LTR Report.
Sih,  G. C., 1974, “Strain Energy Density Factor Applied to Mixed Mode Crack Problem,” Int. J. Fract., 10, pp. 305–321.
Hartranft,  R. J., and Sih,  G. C., 1977, “Stress Singularity for a Crack With an Arbitrarily Curved Front,” Eng. Fract. Mech., 9, pp. 705–718.
Barsoum,  R. S., 1977, “Triangular Quarter-Point Elements as Elastic and Perfectly-Plastic Crack Tip Elements,” Int. J. Numer. Methods Eng., 11, pp. 85–98.
Li,  H.-X., Jones,  R. H., Hirth,  J. P., and Gelles,  D. S., 1998, “Fracture Toughness of the F-82H Steel-Effect of Loading Modes, Hydrogen, and Temperature,” J. Nucl. Mater., 233, pp. 258–263.
Lackey, W. J., Stinton, D. P., Cerny, G. A., Fehrenbacher, L. L., and Schaffhauser, A. C., 2004, “Ceramic Coating for Heat Engine Materials—Status and Future Needs,” Oak Ridge National Laboratory report, ORNL/TM-8959, Oak Ridge National Laboratory.

Figures

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SNTT configuration (left) and sample miniaturization for A533B steel (right)
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SNTT experimental setup
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Stress fields of a torsion bar
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Singular prismatic elements
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SNTT FEM Models: (a) shallow crack; and (b) deep fatigue precrack
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Uniform fatigue crack front is shown from the fractured SNTT sample of 7475-T7351 aluminum
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Nonuniform distributed loading near free surface block of a compact specimen (left); a uniform applied load distribution is shown in a torsion bar sample (right)
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Metallic specimen configuration
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The SNTT A302B specimen: (a) front view; and (b) side view
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Plot of torsion test results from (a) load cell and strain gauge, and (b) load cell and biaxial extensometer

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