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Direct measurements of Rayleigh wave acoustoelastic constants for shot-peened superalloys

 
: Gartsev, Sergey; Köhler, Bernd

:

NDT & E International 113 (2020), Art. 102279
ISSN: 0963-8695
European Commission EC
H2020; 722134; NDTonAIR
Training Network in Non-Destructive Testing and Structural Health Monitoring of Aircraft structures
English
Journal Article
Fraunhofer IKTS ()
Rayleigh wave; acoustoelastic constants; shot peening; nonlinear elastic constants

Abstract
In this article the experimental investigation of surface wave (Rayleigh wave) acoustoelastic constants (AEC) dependency on treatment parameters and plastic deformation is discussed. These constants are demanded for the monitoring of surface treatment intensity with means of ultrasonic testing. The indirect (mapping of bulk wave AEC to the surface wave AEC through the Grüneisen constants) and the direct method are compared for the different states of material (annealed, plastically deformed, surface treated) for the In718 and Ti6246 alloys. It is shown that surface AEC are very sensitive to any changes in material structure up to change in the sign of the effect, and for the practical application the direct in-situ Rayleigh wave AEC measurement should be performed.

: http://publica.fraunhofer.de/documents/N-589191.html