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Abstract

In residual stress measurement with micromagnetic measuring quantities textures have been identified as a disturbing quantity. In order to separate the influence of texture on micromagnetic measuring quantities from the influence of residual stress, it is first necessary to investigate the influence of textures on these measuring quantities. In our research, the influence of texture on the direction-sensitive measuring quantities (magnetic Barkhausen noise, incremental permeability and dynamic magnetostriction) and measuring quantities derived from these is investigated. The 3MA- (micromagnetic multiparameter microstructure - and stress analysis) unit was tested in field appliecations, where the residual surface stress of a turbine rotor and the hardness variations in an inductive hardened ring were of interest. The results show that the 3MA unit, together with sensors, optimized for this particular application, are well suited for a fast and easy nondestructive inspection. The equipment enables qualitative and in some cases also quantitative evaluation of surface stress states and hardness.

Additional information

Authors: ALTPETER I, Fraunhofer-Institut für zerstörungsfreie Prüfverfahren, Saarbrücken (DE);THEINER W A, Fraunhofer-Institut für zerstörungsfreie Prüfverfahren, Saarbrücken (DE);SCHNEIDER E, Fraunhofer-Institut für zerstörungsfreie Prüfverfahren, Saarbrücken (DE);PRITCHARD S E, The National NDT Centre, Harwell Laboratory, Oxon. (GB);SILK M G, The National NDT Centre, Harwell Laboratory, Oxon. (GB)
Bibliographic Reference: EUR 12596 DE/EN (1990) 177 pp., FS, ECU 15
Availability: (2)
ISBN: ISBN 92-826-1227-9
Record Number: 199010638 / Last updated on: 1994-12-01
Category: PUBLICATION
Original language: en
Available languages: de,en
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