Method and apparatus for the ultrasonic testing of bolts with a

Details Method and apparatus for the ultrasonic testing of bolts with a Method and apparatus for the ultrasonic testing of bolts with a

1985-04-11

1987-02-03

Birmiel, Howard A.

Measuring and testing

Vibration

By mechanical waves

73628, 73629, 73637, 73644, G01N 2904

Patent

active

046401318

ABSTRACT:
A method for the ultrasonic testing of bolts for incipient cracks emanating from a wall thickness discontinuity between thinner and thicker parts of the bolt, which includes placing an ultrasound transmitter and receiver in the form of a piezo-electric transducer on the periphery of the thicker part of the bolt with the discontinuity located in the near-field region, radiating longitudinal waves at an angle of 55.degree. to 70.degree. and transversal waves at an angle of 25.degree. to 35.degree. from the transducer in direction toward the discontinuity, and comparing the intensity of reflected transversal and longitudinal waves with an echo characteristic obtained from a test body corresponding to the bolt to be tested, having slots formed therein simulating incipient cracks of different depths, and an apparatus for carrying out the method.

REFERENCES:
patent: 4435984 (1984-03-01), Gruber
patent: 4522064 (1985-06-01), McMillan

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