Crack detection using resonant ultrasound spectroscopy

Details Crack detection using resonant ultrasound spectroscopy Crack detection using resonant ultrasound spectroscopy

1991-12-27

1994-10-04

Williams, Hezron E.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

73659, G01N 2912

Patent

active

053515439

ABSTRACT:
Method and apparatus are provided for detecting crack-like flaws in components. A plurality of exciting frequencies are generated and applied to a component in a dry condition to obtain a first ultrasonic spectrum of the component. The component is then wet with a selected liquid to penetrate any crack-like flaws in the component. The plurality of exciting frequencies are again applied to the component and a second ultrasonic spectrum of the component is obtained. The wet and dry ultrasonic spectra are then analyzed to determine the second harmonic components in each of the ultrasonic resonance spectra and the second harmonic components are compared to ascertain the presence of crack-like flaws in the component.

REFERENCES:
patent: 2915897 (1959-12-01), Hoffmann
patent: 3634759 (1972-01-01), Koshikawa
patent: 4428235 (1984-01-01), Sugiyama
patent: 5062296 (1991-11-01), Migliori
patent: 5144838 (1992-09-01), Tsuboi
patent: 5258923 (1993-11-01), Imam et al.

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