Apparatus for automated crack growth rate measurement

Details Apparatus for automated crack growth rate measurement Apparatus for automated crack growth rate measurement

1984-11-23

1986-03-11

Levy, Stewart J.

Measuring and testing

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

By loading of specimen

73800, G01N 2188

Patent

active

045746427

ABSTRACT:
Apparatus for monitoring and measuring the growth of a crack in an elastic specimen. The specimen is repeatedly flexed by a piston at a set frequency and periodically slowed to a substantially lower frequency during which time a line scan camera monitors the length of the crack. The camera is positioned such that the specimen is drawn through the scan line thereof. The camera is calibrated such that the output signal from the camera correlates directly to the cracklength. This output signal is digitized, received, and stored by a digital processor for use in determining the crack growth rate.

REFERENCES:
patent: 3918299 (1975-11-01), Donnadieu
patent: 3983745 (1976-10-01), Juusola
patent: 4003246 (1977-01-01), Cain
patent: 4175447 (1979-11-01), Fukuhara
patent: 4418563 (1983-12-01), Kalthoff et al.
Ind. Lab. (U.S.A.), vol. 38, No. 2 (Feb. 1972), Burnos et al.

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