A new method, designated as Spiral Notch Torsion Test (SNTT), is developed recently to measure the intrinsic fracture toughness of structural materials. The SNTT overcomes many of the limitations inherent in traditional techniques and makes it possible to standardize fracture toughness testing. It is uniquely suitable for testing a wide variety of materials used extensively in pressure vessel and piping structural components and weldments, including others such as ceramics, their composites, and concrete. The SNTT system operates by applying pure torsion to uniform cylindrical specimens with a notch line that spirals around the specimen at a 45 deg pitch. The values are obtained with the aid of a three-dimensional finite-element computer code, TOR3D-KIC, developed at Oak Ridge National Laboratory (ORNL). The fundamental mechanism of SNTT approach is also described in the paper.
A New Approach to Evaluate Fracture Toughness of Structural Materials
Contributed by the Pressure Vessels and Piping Division for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received by the PVP Division February 25, 2004; revision received July 23, 2004. Associate Editor: P.-S. Lam.
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Wang, J. A., and Liu, K. C. (December 1, 2004). "A New Approach to Evaluate Fracture Toughness of Structural Materials ." ASME. J. Pressure Vessel Technol. November 2004; 126(4): 534–540. https://doi.org/10.1115/1.1804202
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