Abstract
he Oak Ridge National Laboratory (ORNL) spiral notch torsion test (SNTT) system measures the intrinsic fracture toughness (K Ic) of structural materials, overcomes many of the limitations inherent in traditional techniques, and introduces new possibilities for standardizing fracture toughness testing. The system is uniquely suited to test a wide variety of materials, such as metals and alloys, ceramics, composites, polymers, carbon foam, and concrete. The SNTT system operates by applying pure torsion to cylindrical secimens machined with a notch line that spirals around the specimen at a 45° pitch (Fig. 1). Results are obtained with the aid of TOR3D-KIC, a three-dimensional finite-element computer code developed at ORNL, which may be obtained by contacting the author.
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