Ultrasonic method and apparatus for determining crack opening lo

Details Ultrasonic method and apparatus for determining crack opening lo Ultrasonic method and apparatus for determining crack opening lo

1988-06-23

1989-04-25

Myracle, Jerry W.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

G01N 1908

Patent

active

048236098

ABSTRACT:
An ultrasonic apparatus determines crack opening load by placing a transmit transducer on one side of the crack and a receive transducer on the opposite side of the crack. An acoustic signal passing through a region of the crack is mechanically rectified to produce a second harmonic of an input signal. A harmonic output signal of the receive transducer is converted into an electrical signal and the peak harmonic amplitude is determined while increasing a tension load on the specimen. The peak harmonic amplitude indicates crack opening load.

REFERENCES:
patent: 3911734 (1975-10-01), Mehdizadeh
patent: 4265120 (1981-05-01), Morris et al.
patent: 4522064 (1985-06-01), McMillan
patent: 4534219 (1985-08-01), Nadeau et al.
patent: 4669311 (1987-06-01), McKinnon
patent: 4689996 (1987-09-01), Huschelrath
patent: 4763528 (1988-08-01), Bouami et al.

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