Method for measuring damage to structural components

Details Method for measuring damage to structural components Method for measuring damage to structural components

1985-12-19

1987-07-07

Levy, Stewart J.

Measuring and testing

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

By loading of specimen

G01N 1900

Patent

active

046778551

ABSTRACT:
A method is provided for measuring crack growth within a material utilizing reversing d.c. potential measurements across a preformed crack. Preferably, the material is representative of structural components of interest and the material is located within the aggressive environment of such components. The measured values are plotted versus distance to obtain intercept values. These intercept values correspond to the depth of the crack at the time the measured values were obtained.

REFERENCES:
patent: 4003246 (1977-01-01), Cain
patent: 4149406 (1979-04-01), Russenberger
patent: 4452087 (1984-06-01), D'Antonio
Catlin, Lord, Prater and Coffin, "The Reversing DC Electrical Potential Method", Automated Test Methods for Fracture and Fatigue Crack Growth, ASTM, STP877, Philadelphia 1985, pp. 67-85.
Prater, Catlin and Coffin, "Application of the Reversing DC Electrical Potential Technique to Monitoring Carck Growth in Pipes", CRD Report No. 85CRD095, Jun. 1985.
Novak and Rolfe, "Modified WOL Specimen for K.sub.iscc Environmental Testing", Journal of Materials, vol. 4, pp. 701-728, 1969.
Taka, Pasis and Irwin, "The Stress Analysis of Cracks Handbook", Del Research Corp., Hellertown, Pa, 1973, pp. 29.3, 29.4.
Klintworth, "Fatigue Crack Propagation in High Strength Low-Alloy Steel Using an Electrical Potential Method", M. Sc. Thesis, Imperial College of Science and Technology, University of London, Oct. 1977.
Editor: General Electric Company, "Electric Potential Drop Monitor", Operating and Instruction Manual.

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