Method and apparatus for measuring stress

Details Method and apparatus for measuring stress Method and apparatus for measuring stress

1983-07-28

1985-06-11

Birmiel, Howard A.

Measuring and testing

Vibration

By mechanical waves

73643, G01N 2900

Patent

active

045220719

ABSTRACT:
A method and apparatus for determining stress in a material independent of micro-structural variations and anisotropies. The method comprises comparing the velocities of two horizontally polarized and horizontally propagating ultrasonic shear waves with interchanged directions of propagation and polarization. The apparatus for carrying out the method comprises periodic permanent magnet-electromagnetic acoustic transducers for generating and detecting the shear waves and means for determining the wave velocities.

REFERENCES:
patent: 4080836 (1978-03-01), Thompson et al.
patent: 4127035 (1978-11-01), Vasile
patent: 4218924 (1980-08-01), Fortunko
"Periodic Magnet Non-Contact Electromagnetic Acoustic Wave Transducer-Theory and Application", Vasile et al., 1977 Ultrasonics Symposium Proceedings, IEEE Cat. #78CH1344-ISU.

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