Towards in-situ determination of Rayleigh wave acoustoelastic constants for surface treated materials characterization

Characterization of metal’ surface treatment intensity with ultrasound requires a deep knowledge o f material attribute s. In particular, residual stress characterization with surface acoustic waves (Rayleigh waves) or bulk waves demands a n awareness for nonlinear elastic prope rties. In this article several experimental works for the determination of acoustoelastic constants /third order elastic constants (AEC /TOEC for bulk and surface waves for Inconel 718 and Titanium 6246 alloys are compared . In addition, a new method for in situ TOEC determination is proposed and preliminary numerical simulation are shown.