Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1989-02-09
1990-05-15
Myracle, Jerry W.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
G01N 1908
Patent
active
049247085
ABSTRACT:
A method is provided for measuring crack growth in a solid comprising a sensor utilizing potential or voltage drop measurements across a preformed and propagating crack. Preferably the sensor is representative of a structural component and is exposed to an aggressive environment like that in which the structural component operates. Measured voltage values are plotted versus a distance at which the voltages are measured by a plurality of pairs of probes, and intercept values are obtained and used in combination with previously measured crack lengths in calculating subsequent crack lengths of a propagating crack.
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patent: 4535629 (1985-08-01), Prine
patent: 4677855 (1987-07-01), Coffin et al.
Catlin, Lord, Prater and Coffin, "The Reversing DC Electrical Potential Method", Automated Test Methods for Fracture and Fatigue Crack Growth, ATSM, STP877, Philadelphia, 1985, pp. 67-85.
Prater, Catlin and Coffin, "Application of the Reversing DC Electrical Potential Technique to Monitoring Crack 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.
Tada, Paris and Irwin, "The Stress Analysis of Cracks Handbook", Del Research Corp., Hellertown, PA, 1973.
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, pp. 79-80.
Editor: General Electric Company, "Electric Potential Drop Monitor", Operating and Instruction Manual.
Catlin William R.
Solomon Harvey D.
Davis Jr. James C.
General Electric Company
Magee Jr. James
McGinness James E.
Myracle Jerry W.
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