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NDT.net Issue - 2018-08 - Articles
NDT.net Issue: 2018-08
Publication: 12th European Conference on Non-Destructive Testing (ECNDT 2018), Gothenburg 2018, June 11-15 (ECNDT 2018)
Session: Materials Characterization UT
ARTICLE

New measurement approach for determination of residual stress and cold work at surface treated aeroengine materials

Bernd Köhler149, Johannes Kissing2, Sergey Gartsev13, Martin Barth125, Marek Rjelka16, Joachim Bamberg229, Roland Hessert28
1Branch Lab Dresden; Fraunhofer Institute for Ceramic Technology and System (IKTS)230, Dresden, Germany
2Nondestructive Testing (TEFP); MTU Aero Engines GmbH53, Munich, Germany

Abstract: Aero Engine materials are exposed to high temperatures and high stresses in operation. To increase the fatigue strength, the surface is treated by shot peening, laser peening or deep rolling. These processes introduce compressive residual stress and structure modifications (cold work) in a near surface layer. There are several attempts to determine these advantageous surface property gradients nondestructively. The applied methods include eddy current and Rayleigh waves velocity measurements. Recently the application of the Hall-effect was also proposed. Besides selectivity, all these methods lack of good sensitivity. A very small change in a large signal has to be measured reliably; a big challenge for a method, supposed to be applied in a harsh repair shop environment. The here proposed new method builds up on Rayleigh wave propagation through a straight line between a surface treated and a non-treated area. Even a slight change of sound velocity between both regions lead to significant refraction effects for the wave paths with near grazing incidence. The wave propagation is visualized for such cases by laser vibrometer measurements. Moreover, the following is demonstrated: when the incidence angle to the border line in a pitch catch arrangement is varied, significant transmission drops of up to 30 % are observed. This comprises a very solid measurement effect. Possible arrangements for future practical applications are discussed.

Keywords: aerospace (926), stress (152), surface waves (25), Ultrasonics (229), Novel Techniques (56), Propagagation and scattering (34),
*Keywords are freely formed keywords from the authors and thus you may Search also for similar terms.

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