Apparatus for detecting crack length of a test piece in a fatigu

Details Apparatus for detecting crack length of a test piece in a fatigu Apparatus for detecting crack length of a test piece in a fatigu

1978-10-25

1979-11-27

Myracle, Jerry W.

Measuring and testing

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

By loading of specimen

73808, G01N 332

Patent

active

041754476

ABSTRACT:
An apparatus for detecting crack length of a test piece in a fatigue test wherein crack length is automatically detected and the tip of the crack is displayed on a monitor.
A test piece having a crack thereon is irradiated by a Strobo light through an optical-scope. Reflected beams from the test piece are focused on a camera tube by passing through the optical-scope thereby forming an image of the crack on the camera tube.
The image is then picked up by a scan converter memory so as to be memorized for an extended period.
The memorized image is then introduced into an image analyser while monitored on a monitor screen. The tip of the crack is analysed and calculated in the image analyser and the position of the optical-scope is adjusted accordingly.
A command controller is employed to control an overall time sequence of the entire apparatus.

REFERENCES:
patent: 3918299 (1975-11-01), Donnadieu
patent: 3983745 (1976-10-01), Juusola

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