Manufacturing Industry
Spiral notch torsion test evaluates fracture toughness. (Testing/Analysis).
Advanced Materials & Processes, December, 2002
A portable system that tests fracture toughness and strength of materials has reportedly been developed by Oak Ridge National Laboratory, Oak Ridge, Tenn., and Inventure Laboratories Inc., Knoxville, Tenn. The spiral notch torsion test (SNTT) provides information that can prevent accidental cracking or breaking of structural materials.
The instrument is suitable for testing many materials, including metals, alloys, ceramics, composites, polymers, carbon foam, and concrete. The SNTT system operates by applying pure tension to unique cylindrical specimens marked with a machined notch line that spirals down the specimen at a 45-degree pitch. The crack produced is controlled, propagating perpendicularly toward the central axis of the specimen. [K.sub.JC] is...
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