Measuring and testing – Vibration – By mechanical waves
Patent
1988-04-29
1990-02-13
Tokar, Michael J.
Measuring and testing
Vibration
By mechanical waves
73602, G01N 2900
Patent
active
048995894
ABSTRACT:
A method for measuring texture of metal plates or sheets using non-destructive ultrasonic investigation includes measuring the velocity of ultrasonic energy waves in lower order plate modes in one or more directions, and measuring phase velocity dispersion of higher order modes of the plate or sheet if needed. Texture or preferred grain orientation can be derived from these measurements with improved reliability and accuracy. The method can be utilized in production on moving metal plate or sheet.
REFERENCES:
patent: 2536128 (1951-01-01), Firestone et al.
patent: 4432234 (1984-02-01), Jones
patent: 4790188 (1988-12-01), Bussiere et al.
Krautkramer et al., "Ultrasonic Testing of Materials" 2nd Ed., (1975), pp. 11, 12, 20, 21, 22.
Worlton, D.C., "Lamb Waves at Ultrasonic Frequencies" Jun. 9, 1959 printed for the AEC.
S. S. Lee, J. F. Smith and R. B. Thompson, "Inference of Crystallite Orientation Distribution Function Form the Velocites of Ultrasonic Plate Modes", Nondestructive Characterization of Materials, J. F. Bussiere, Ed. (Plenum Press, N.Y. in press).
Thompson, R. B., Lee, S. S., and Smith, J. F., "Angular Dependence of Ultrasonic Wave Propagation in a Stressed Orthorhombic Continuum Theory and Application to the Measurement of Stress and Texture", J. Acoust. Soc. Amer., 80, 921-931, Sep. 1986.
Thompson, R. B., Smith, J. F., and Lee, S. S., "Inference of Stress and Texture from the Angular Dependence Ultrasonic Plate Mode Velocities", Non-Destructive Evaluation of Microstructure for Process Control, H. N. G. Wadley, Editor (Asm. Metal Park, Ohio 1985).
Thompson, R. B., and Vasile, C. F., "An Elastic-Wave Ellipsometer for Measurement of Material Property Variations", App. Phys. Lett. 34, 128-130 (1979).
Lee Seung S.
Li Yan
Smith John F.
Thompson R. Bruce
Fess Lawrence G.
Iowa State University Research Foundation
Tokar Michael J.
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