Double-cantilever beam type test piece and corrosive environment

Details Double-cantilever beam type test piece and corrosive environment Double-cantilever beam type test piece and corrosive environment

1991-03-18

1994-06-07

McMahon, Timothy M.

Measuring and testing

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

By loading of specimen

422 53, 436 6, G01N 1900

Patent

active

053179250

ABSTRACT:
A corrosive environmental crack length measuring apparatus including a double-cantilever beam type test piece having a tapered portion in a portion where the crack grows, a slit, and at least two holes, with the test piece being placed within a corrosive environment. Leads inserted in the holes of the test piece to be spot-welded thereto to supply a direct current to the holes. A current polarity switching device is provided with, a stabilized direct current power supply connected with the direct current supplying leads through the current polarity switching device. Potential difference measuring leads are inserted in holes formed in two outer faces of the double-cantilever beam type test piece parallel to a section of a crack growing portion at a plurality of points along the crack growing direction so as to be spot-welded thereto. A multiplexer is provided with, a micro-voltmeter connected with the potential difference measuring leads through the multiplexer, and an arithmetic unit judges crack length based on ratios between potential differences measured by switching the polarity of direct current using the current polarity switching device.

REFERENCES:
patent: 4003246 (1977-01-01), Cain
patent: 4149406 (1979-04-01), Russenberger
patent: 4198870 (1980-04-01), Barker et al.
patent: 4677855 (1987-07-01), Coffin, Jr. et al.
patent: 4711131 (1987-12-01), Hopkins
patent: 4763528 (1988-08-01), Bouami et al.

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