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Acoustic emission (AE) allows for the in-situ monitoring of damage during the thermal and mechanical solicitation of a material and can be used to identify various damage mechanisms and interpret the way they interact, in particular, in multi-material systems. In the present work AE activity was monitored during the step-wise tensile testing and during the thermo-mechanical fatigue (TMF) of Ni-base super alloys (in single-crystalline and directionally solidified form), coated with oxidation protection coatings. The classification analysis of the AE signals revealed that AE monitoring provides complementary and specific information about the surface-, subsurface-, and bulk damage processes. In combination with the mechanical response and the surface damage analysis by video imaging, it represents a powerful means for non-destructive damage assessment and it offers possibilities for the lifting of coated material systems.

Additional information

Authors: VOUGIOKLAKIS Y, JRC, IAM, Petten (NL) and University of Patras, Department of Mechanical Engineering and Aeronautics (GR);H?HNER P ET AL, JRC, IAM, Petten (NL)
Bibliographic Reference: An oral report given at: The 4th Symposium on Thermomechanical Fatigue Behaviour of Materials. Held in: Dallas, Texas (US), 7-8 November 2001
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