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Non destructive testing for cracks in perforated sheet metals

  • The production and deformation of perforated sheets introduces high levels of mechanical stress into the material. In a significant fraction, such stress levels lead to crack formation in the processed sheets. Additionally, the material might be thinned and weakened in the exposed areas; these areas tend to crack at any later dates. Currently no measuring device for the detection of such material cracks or narrowing in perforated sheet metals is in practical use. Such device should be able to test the deformed circumference of the processed sheets within the very limited time of the production cycles. This paper describes the physical principles and a metrological implementation of a potential method for fast crack detection in perforated sheet metals. Even a critical material thinning - prior to the formation of a crack - can be observed. The measuring task appears to be solvable on the basis of high frequency electromagnetic fields.

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Author:Maral Heidary Dastjerdi, Markus Rübesam, Dirk Rüter, Jörg Himmel
Parent Title (English):Sensors, Transactions on Systems, Signals & Devices
Document Type:Article
Year of Completion:2012
Date of first Publication:2019/02/06
Release Date:2019/02/06
First Page:1
Last Page:14
Institutes:Fachbereich 4 - Institut Mess- und Senstortechnik
DDC class:600 Technik, Medizin, angewandte Wissenschaften / 621.3 Elektrotechnik, Elektronik
Licence (German):License LogoNo Creative Commons