Ultrasonic method for measuring internal contact pressure betwee

Details Ultrasonic method for measuring internal contact pressure betwee Ultrasonic method for measuring internal contact pressure betwee

1987-12-31

1989-10-03

Chapman, John

Measuring and testing

Vibration

By mechanical waves

73761, 73778, G01N 2900

Patent

active

048708666

ABSTRACT:
A method is provided for directly measuring the contact pressure on the mating interfaces of two solids undergoing compression where the interfacial region contains an entrapped film of liquid. An acoustic pulse is directed at either interface. A reference amplitude of the acoustic pulse reflected from the interface is measured as it bears initial contact pressure. A second "loaded" amplitude of the acoustic pulse reflected from the interface is measured when the interface is bearing a different contact pressure. A measure indicative of the change in contact pressure is computed from the ratio of the reference and loaded amplitude measurements by correlation with a calibration curve.

REFERENCES:
patent: 3307393 (1967-03-01), Kessler
patent: 4484475 (1984-11-01), Ogura et al.
J. Krautkramer et al., Ultrasonic Testing of Materials (Springer-Verlag, New York), 1983, pp. 516-517.

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