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Acoustic emission (AE) as a technique for detecting and locating flaws in thick-walled steel pressure vessels is being investigated as a part of the Heavy-Section Steel Technology Program at Oak Ridge National Laboratory (ORNL). A detailed description of the acoustic emission monitoring of the most recently completed vessel test, V-7B, and the fatigue crack sharpening of the flaw for test vessel V-8 is presented. Results obtained during these tests indicate that AE is capable of locating flaws, detecting the onset of flaw growth, and providing an indication of the rate of crack extension (immediacy of fracture).
acoustics, emission, pressure vessels, defects, crack propagation, residual stress, failure
Development specialist, Oak Ridge National Laboratory, Oak Ridge, Tenn