Measuring and testing – Vibration – Hardness or compliance
Patent
1986-07-25
1987-10-27
Myracle, Jerry W.
Measuring and testing
Vibration
Hardness or compliance
73 78, G01M 700
Patent
active
047021101
ABSTRACT:
The present invention is a method and apparatus for measuring the average hardness of a metal. This method capitalizes on the discovery that a longitudinal wave will travel roughly twice as fast as a transverse (shear) wave, the times-of-flight of the two waves are affected to different degrees by hardness, and there is a linear relationship between velocity and hardness. Longitudinal and transverse ultrasonic signals are applied to a first end (face) of the metal. The longitudinal and transverse signals are detected at this same first end of the metal after they are reflected off of the second end (face) of the metal. The time-of-flight for each of the longitudinal and transverse waves is measured. The hardness, H, in the metal is then determined by applying substantially the following equation: ##EQU1## where: H.sub.1 =known hardness for the hard phase of the metal;
REFERENCES:
patent: 3416365 (1968-12-01), Frederick
patent: 3955404 (1976-05-01), Bickel et al.
"Ultrasonic hardness testing", (Ultrasonics/Apr. 1966), pp. 88-91.
"Acoustic Measurements of Stress Fields and Microstructure", (Journal of Nondestructive Evaluation), vol. 1, No. 1, 1980.
J. A. Green Company
Myracle Jerry W.
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