Published July 17, 1984 | Version v1
Report Metadata-only

Application of the d.c. potential method for continuous crack length measurement in CT samples of Incoloy 800 H at temperatures above 8000C

Creators

Description

rhe direct-current potential method for continuous crack length measurements, which is designed to be applied at temperatures above 8000C, is introduced. This method is optimized with respect to the positions of initial current and potential tapping points, with the aim of obtaining an optimal synthesis of reproducibility, sensitivity and signal-to-noise ratio. Calibration curves were determined experimentally by simulating the crack with saw cuts. These were compared with finite-element calculations from relevant literature, and tested in an experiment on the growth of fatigue cracks. A first attempt made in an experiment on the growth of fatigue cracks in Incoloy 800 H at 8500C is presented. (orig.)

Availability note (English)

Copy held by UB/TIB Hannover.

Abstract (German)

Die Gleichstrompotentialmethode zur kontinuierlichen Risslaengenmessung fuer den Einsatz bei Temperaturen oberhalb 8000C wird vorgestellt. Es erfolgt eine Optimierung dieses Verfahrens hinsichtlich Lage der Stromeinleitungs- und Potentialabgriffspunkte mit dem Ziel einer optimalen Synthese aus Reproduzierbarkeit, Empfindlichkeit und Signal-Rauschspannungsverhaeltnis. Es wurden auf experimentellem Wege durch Simulation des Risses mit Saegeschnitten Eichkurven ermittelt. Diese wurden mit Finite-Element Rechnung aus der Literatur verglichen und darueberhinaus in einem Versuch zum Ermuedungsrisswachstum ueberprueft. Ein erster Versuch zum Ermuedungsrisswachstum in Incoloy 800 H bei 8500C wird dargestellt. (orig.)

Additional details

Additional titles

Original title (German)
Anwendung der Gleichstrompotentialmethode zur kontinuierlichen Risslaengenmessung an CT-Proben aus Incoloy 800 H bei Temperaturen oberhalb 800

Publishing Information

Imprint Pagination
21 p.
Report number
KFA-IRW-TN--69/84

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
21001930
Subject category
S36: MATERIALS SCIENCE;
Resource subtype / Literary indicator
Non-conventional Literature
Descriptors DEI
ALLOY-FE44NI33CR21; CRACK PROPAGATION; CREEP; ELECTRIC POTENTIAL; FATIGUE; FRACTURE MECHANICS; MEASURING METHODS; VERY HIGH TEMPERATURE
Descriptors DEC
ALLOYS; ALUMINIUM ADDITIONS; CHROMIUM ALLOYS; COBALT ALLOYS; CORROSION RESISTANT ALLOYS; HEAT RESISTING ALLOYS; INCOLOY ALLOYS; IRON ALLOYS; IRON BASE ALLOYS; MECHANICAL PROPERTIES; MECHANICS; NICKEL ALLOYS; TITANIUM ADDITIONS