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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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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