Measuring and testing – Vibration – Hardness or compliance
Patent
1985-08-26
1987-03-03
Levy, Stewart J.
Measuring and testing
Vibration
Hardness or compliance
73579, G01N 348, G01N 338, G01M 700
Patent
active
046465715
ABSTRACT:
This invention discloses a method and apparatus for determining the hardness of a solid workpiece. An elongated rod is excited to be mechanically resonant along its longitudinal axis and is provided at its front end with a defined contact surface of hard material (Vickers diamond). When the rod is rendered resonant at its natural frequency of vibration .omega.o, the contact surface of the rod is pressed into the surface of the workpiece, whose hardness is to be determined, under a predetermined engagement force while the rod is forcibly maintained oscillating at the frequency .omega.o. A sensor coupled to the rod provides a signal indicative of the amplitude of vibrations of the rod when in forced contact with the workpiece and such signal is fed to a computing device for providing a value indicative of the hardness of the workpiece.
REFERENCES:
patent: 2695517 (1954-11-01), Wiggins
patent: 3153338 (1964-10-01), Kleesattel
patent: 3572097 (1971-03-01), Kleesattel
patent: 3955404 (1976-05-01), Bickel et al.
patent: 3958450 (1976-05-01), Kleesattel
patent: 4523467 (1985-06-01), Diedericks et al.
"Sensitivity of Hardness Measurement by the Acoustic Method"; Sov. J. Nondest. Test. (USA); vol. 17, No. 5 (May 1981); published Jan. 1982; V. A. Prikhod 'Ko et al; pp. 363-366.
"The Contact-Impedance Meter-2"; Ultrasonics; Oct. 1968; pp. 244-251; G. M. L. Gladwell et al.
Bergerhausen Stephan
Kising Jurgen
Feig Philip J.
Krautkramer- Branson, Incorporated
Levy Stewart J.
Noland Tom
Steinberg Ervin B.
LandOfFree
Method and apparatus for hardness measurement does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for hardness measurement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for hardness measurement will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1010221