Ultrasonic Shear Wave Measurements of Known Residual Stress in Aluminum
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Ultrasonic shear wave time-of-flight measurements were made at a nominal frequency of 4 MHz on a shrink-fit disk sample of 2024 aluminum alloy. The stress state of the sample was produced by shrink-fitting a plug and ring to produce a calculated 130 MP a region of uniform compression in the plug, and a concomitant nonuniform tension and compression in the ring. Time-of-flight measurement scans across sample diameters were made using a piezoelectric shear transducer with a viscous couplant, and repeated using a contactless electromagnetic acoustic transducer. The ultrasonic results were then compared with elasticity theory, assuming the acoustoelastic relationship between sound velocity and material strain.
KeywordsResidual Stress Shear Wave Isochromatic Fringe Principal Stress Difference Wave Transit Time
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