Electrochemical measurement of fatigue damage

Details Electrochemical measurement of fatigue damage Electrochemical measurement of fatigue damage

1978-04-21

1979-07-10

Prescott, Arthur C.

Chemistry: electrical and wave energy

Processes and products

204 58, 204195R, G01N 2742, G01N 308

Patent

active

041607023

ABSTRACT:
Testing method for the early detection and assessment of metal fatigue damage prior to the initiation of fatigue cracks. Test parts are anodized to form an oxide coating thereon. The anodized parts are fatigue tested. Microcracks created in the oxide coating occur at the situs of deformations induced at the surface of the parts during testing. The location and extent of the microcracking is determined electrochemically by reanodizing the parts such as to anodically heal the microcracks and measuring the reanodization charge required for healing. Reanodizing incremental portions of the part point up areas of the part which allow higher current transients which in turn indicate the locations where fatigue damage is accumulating.

REFERENCES:
patent: 3408270 (1968-10-01), Gentile
patent: 3419479 (1968-12-01), Klein
patent: 3437568 (1969-04-01), Hasselmann et al.
patent: 3710616 (1973-01-01), Smith et al.
patent: 4019129 (1977-04-01), Grau

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