Method for determining crack lengths

A method is provided for measuring crack growth in a solid (10) comprising a sensor utilizing potential or voltage drop measurements across a preformed and propagating crack (20). Preferably the sensor is representative of a structural component and is exposed to an aggressive environment like that...

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Bibliographische Detailangaben
Hauptverfasser:	SOLOMON, HARVEY DONALD, CATLIN, WILLIAM RAMSAY
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING MEASURING ANGLES MEASURING AREAS MEASURING IRREGULARITIES OF SURFACES OR CONTOURS MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS PHYSICS TESTING
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Beschreibung
Zusammenfassung:	A method is provided for measuring crack growth in a solid (10) comprising a sensor utilizing potential or voltage drop measurements across a preformed and propagating crack (20). 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 (26,28,30), and intercept values are obtained and used in combination with previously measured crack lengths in calculating subsequent crack lengths of a propagating crack.