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Auto-calibration principles for two-dimensional residual stress measurements by Barkhausen noise technique

: Cikalova, Ulana; Schreiber, Jürgen; Hillmann, Susanne; Meyendorf, Norbert


Chimenti, D.E. ; American Society for Nondestructive Testing -ASNT-, Columbus/Ohio:
40th Annual Review of Progress in Quantitative Nondestructive Evaluation 2013. Vol.33B. Pt.1 : Incorporating the 10th International Conference on Barkhausen Noise and Micromagnetic Testing; 40th NDE, 10th ICBM; Volume 33A and 33B; Baltimore, Maryland, USA, 21-26 July 2013
Woodbury, N.Y.: AIP, 2014 (AIP Conference Proceedings 1581)
ISBN: 978-0-7354-1213-2
ISBN: 978-0-7354-1211-8 (4-Vol. Set)
ISBN: 978-1-63266-043-5
Annual Review of Progress in Quantitative Nondestructive Evaluation <40, 2013, Baltimore/Md.>
International Conference on Barkhausen Noise and Micromagnetic Testing <10, 2013, Baltimore/Md.>
Fraunhofer IKTS ()

The magnetic Barkhausen Noise (BN) is well suited to evaluate the effects of mechanical stresses of ferromagnetic materials, e.g. the indirect detection of residual stress states. The most common causes for the occurrence of residual stresses are manufacturing processes, such as casting, welding, machining, forming, heat treatment, etc., consecutive repairs and design changes, and installation or assembly and overloads during the operating life of a construction. A significant calibration effort based on a set of reference values and/or test samples is needed for these measurements, which require a great deal of time and material resources. Additionally, it is impossible to determine the stress states of different components (σ xx and σ yy ) at the surface. Therefore, a new auto-calibration method was developed to analyze two-dimensional stresses. A fixed calibration function based on defined parameters (determined experimentally) was applied. To adjust the auto-calibration function to the experimental reference values by varying functional parameters, a large number of measurement points were used. We present a method that can calculate, based on the multi-dimensional stress state at the measuring point, the stress components σ xx and σ yy for two perpendicular magnetization directions using the Barkhausen Noise effect.