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M2A members involved in the Acoustics axis:  

Augereau F. (MC), Combette P. (PR), Delaunay T. (MC), Despaux G. (PR), Ferrandis J.-Y. (IR CNRS HDR), Guillemard O. (AT UM),  Launay Y. (T CNRS),  Laux D. (MC HDR), Le Clézio E. (PR), Lévèque G. (PR émérite), Rosenkrantz E. (MC), 

Alarab M. (Doctorant), Essabar M. (Doctorant), Faucon D. (Doctorant CIFRE), Iklil A. (Doctorant), Megzari A. (Doctorant CIFRE) - En cours - 

Bah M. (Doctorant, Post-Doctorant), Lanotte L. (Post-Doctorant), Manga E. D. (Post-Doctorant), Almonacid V. (Doctorant), Boubenia R. (Doctorant), Chrifi-Alaoui M. (Doctorant), Dekious A. (Doctorant CIFRE), Engrand C. (Doctorant),  Gatsa O. (Doctorant), Lapeine D. (Doctorant), Marchetti M. (Doctorant), Meignen P.-A. (Doctorant), Mograne A. (Doctorant), Saikouk H. (Doctorant), Very F. (Doctorant), Zaz G. (Doctorant)

The Acoustics axis of the M2A group is structured around a spinal column resulting from skills in the development and shaping of piezoelectric materials for the design and manufacture of ultrasonic sensors.

The research aims to meet two main objectives:

- To increase the understanding of the phenomena of acoustic wave interaction and propagation media in order to propose ultrasonic solutions for multi-scale characterization or control of the mechanical behaviour of materials and structures.

Waves guided in a glued structure: Influence of the adhesive layer thickness on the dispersion curves

- Extend the operating fields of instrumentation and acoustic measurement methods in hostile environments, particularly for high temperatures and radiative environments.

  Nuclear fuel assembly for PWR plants

All this work requires a mastery of the entire acquisition chain, from the electronics to the sensor, as well as a detailed understanding of the propagation of ultrasonic waves to extract relevant information on the material from signals that are often disturbed. We therefore have the scientific and technical skills to design ultrasonic systems, manufacture sensors and associated electronics, and implement them within specific devices dedicated to the analysis of the complex physical phenomena we model.

The activities of the Acoustics axis focus on two research themes:

The first, dedicated to ECND, is interested in the development of ultrasonic acoustic solutions for Non-Destructive Evaluation, Testing and Characterization. To do this, our team masters and develops a large number of acoustic methods and tools (propagative and resonant) allowing a multi-frequency characterization of the acoustic properties of a wide range of materials and structures. This work is aimed in particular at determining viscoelastic properties and predicting the laws of mechanical behaviour of complex materials.

The IAMH theme, Acoustic Instrumentation in Hostile Environment, is dedicated to non-destructive ultrasonic measurement and characterization in hostile environments. Research work is recognised through more than two decades of partnerships with the main nuclear players such as EDF, CEA, or ITU-JRC in Karksruhe for the European Commission. They contribute to increasing knowledge of the behaviour of fuel assemblies during their irradiation. The group's research focused on the design and manufacture of sensors, the design of specific electronic processing chains, and the production of complete prototypes with specificity focused on characterizing the performance of devices under irradiation and/or temperature.

For example, one of the group's projects, which was initiated more than 20 years ago, can be seen as emblematic of the transversal skills resulting from these two themes. It concerns the characterization of the elastic properties of irradiated fuels.  
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Acoustic image of a brown lava from Chernobyl by Acoustic Microscopy at 60MHz.