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Anrissermittlung mit dem Gleichstrom-Potentialsonden-Verfahren

Crack initiation detection using the DC-potential-drop technique

: Fraunhofer-Institut für Betriebsfestigkeit -LBF-, Darmstadt

	Darmstadt, 1991, 12 pp. : Abb.,Tab.,Lit. Technische Mitteilungen - Fraunhofer-Institut für Betriebsfestigkeit Darmstadt, 100 ISSN: 0173-3656

	German
	Book
	Fraunhofer LBF ()
	Anriß; Anrißkriterium; Anrißlebensdauer; cast steel; compensation of temperature; crack depth; crack initiation; crack initiation criterion; crack initiation fatigue life; crack length; measurement; Meßverfahren; nondestructive testing; potential drop technique; Potentialsondenverfahren; Probestab; Rißtiefe; Spannung; specimen; Stahl; Stahlguß; steel; stress; Temperatur; temperature; Temperaturkompensation; zerstörungsfreie Prüfung

Abstract
During the application of the DC-potential-drop technique in crack initiation detection very often an influence of changing temperatures on the measured potentials had to be observed. This is not only due to the thermocouple effect, that can be eliminated by a zero-current calibration measurement, but also due to a changing of the specific resistance of the material. In the present publication a principle is outlined, how the errors due to temperature dependent material's behaviour in the DC-technique can be suppressed using a computer based online data aquisition package, that is able to reduce the influence of temperature.

: http://publica.fraunhofer.de/documents/PX-43325.html