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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: Nonlinear Ultrasonics
ARTICLE

Nonlinear elastic behavior of aero-engine materials for microstructure and stress state characterization

Sergey Gartsev3, Marek Rjelka6, Martin Barth25, Bernd Koehler
Fraunhofer Institute for Ceramic Technology and System (IKTS)230, Dresden, Germany

Abstract: Aero-engine parts are exposed to severe environmental conditions like high temperatures and mechanical stresses, which require robust materials. Therefore, they are produced from superalloys, and their surfaces receive an additional mechanical treatment, e.g. by shot-peening, a procedure in which small metal beads are shot upon the surface. This process introduces residual stresses which are held in the specimen by dislocations. In the course of the fatigue lifetime these dislocations will form slip bands, which will move on to the surface and generate micro-cracks there. Such cracks in turn lead to a modification of the elastic constants. To measure the state of stress by the acousto-elastic effect, the elastic constants of third order (TOEC) have to be known. In this paper overview for TOEC surface measurements with 2 approaches is presented. One of the methods is the acousto-elastic constants (AEC) determination. Results of AEC measurements with velocity dispersion for Inconel 718 are shown. In the other part utilization of surface acoustic waves (SAW) mixing for TOEC determination is preliminary examined. Results of acoustic nonlinear parameter measurements for Ti6246 are presented.

Keywords: Ultrasonic Testing (UT) (4104), stress (152), Ultrasonics (228), Novel Techniques (56),
*Keywords are freely formed keywords from the authors and thus you may Search also for similar terms.

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