Time-of-flight method for sizing cracks through fluid-filled gap

Details Time-of-flight method for sizing cracks through fluid-filled gap Time-of-flight method for sizing cracks through fluid-filled gap

1992-10-26

1996-02-20

Chilcot, Jr., Richard E.

Measuring and testing

Vibration

By mechanical waves

73596, G01N 2900

Patent

active

054920124

ABSTRACT:
A method and apparatus for sizing a surface-connected planar crack through a gas- or liquid-filled gap. Ultrasonic energy having a frequency equal to the resonant frequency of the gap is emitted toward the crack edge. A first portion of the energy is back-scattered by the crack edge toward the emitter in a detection mode and a second portion is scattered by the crack edge toward a surface to which the crack is connected, which reflects the second portion toward a detector. The difference between the respective times-of-flight from emission to detection of the first and second portions is measured and used to determine the depth of penetration of the surface-connected crack. The paths traveled by the first and second portions of said emitted ultrasonic energy substantially intersect at the gap. A similar method also applies in sizing buried planar cracks across fluid-filled gaps.

REFERENCES:
patent: 4522064 (1985-06-01), McMillan
patent: 4570487 (1986-02-01), Gruber
patent: 4658649 (1987-04-01), Brook
patent: 5118464 (1992-06-01), Richardson et al.
Locating and Sizing Surface-breaking Cracks, by Peterson et al., Materials Evaluation, 42, Apr. '84.
J. P. Charlesworth et al., Engineering Applications of Ultrasonic Time-of-Flight Diffraction, John Wiley & Sons, Inc., 1989, pp. 1-34.
J. & H. Krautkramer, Ultrasonic Testing of Materials, Springer-Verlag, 4th Ed., 1990, pp. 18-23.

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