Method of continuously determining crack length

Details Method of continuously determining crack length Method of continuously determining crack length

1991-05-24

1993-07-13

Harvey, Jack B.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324699, 73799, G01R 2702, G01N 1908

Patent

active

052277313

ABSTRACT:
A crack length sensor is fabricated in a rectangular or other geometrical form from a conductive powder impregnated polymer material. The long edges of the sensor are silver painted on both sides and the sensor is then bonded to a test specimen via an adhesive having sufficient thickness to also serve as an insulator. A lead wire is connected to each of the two outwardly facing silver painted edges. The resistance across the sensor changes continuously as a function of the crack length in the specimen and sensor.

REFERENCES:
patent: 2589983 (1952-03-01), Blodgett et al.
patent: 3603142 (1971-09-01), Saylak
patent: 4255974 (1981-03-01), Dufrane et al.
Dally, J. W. and G. A. Panizza. "Conductive Polymers as Fatigue-damage Indicators" Experimental Mechanics, Mar. 1972, pp. 124-129.
CDC-2; Crack Detecting Coating; BLH Electronics, Waltham, Mass., Sep. 1977.
Krack-Gage; Drawings, Specifications, Selection Table; Hartrun Corp., St. Augustine, Fla.; pp. 2-6, Jan. 1990.
Crack Detection Gages: Catalog 500, Part A-Strain Gage Listings; Micromeasurements Division, Raleigh, N.C., pp. 76-79, Dec. 1988.

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