Abstract

The objective of the proposed work deals with the ultrasonic analysis of local porosity clusters in order to correlate the ultrasonic indications to fatigue failure criteria. The aim is to study multiple scattering effects and to quantify the differences in comparison with simple scattering considerations. In order to simulate a set of porosities, we have considered equivalent voids in 2D such as cylindrical Side Drilled Holes (SDH). In a first part, the modeling of multiple scattering phenomena is presented using an exact formulation based on a formal solution in terms of cylindrical wave functions satisfying free space boundary conditions simultaneously at the surface of each cylinder. For both multiple and simple scattering assumptions, directivity diagrams are proposed in order to quantify the influence of the multiple interactions. Illustrations of the displacement potential are also shown for this goal. Then FMC acquisitions have been performed using simple or multiple scattering assumptions to estimate effects on TFM imaging technique. Finally, these simulations are compared with experimental FMC-TFM results. The simulations give realistic imaging and should permit to determine precise information to predict lifetime of the structure in fatigue.

How to Cite:

Vasseur, J. ., Chaki, S. ., Leymarie, N. . & Dupont, B. ., (2019) “TFM-imaging of side drilled holes clusters”, Review of Progress in Quantitative Nondestructive Evaluation .