The Transversal Axes

The Metamaterials transverse research axis aims at encouraging the emergence of new topics on structured artificial materials, allowing to innner and transversal collaborations between the laboratory's research teams and research operations (OR), with a special attention to promote the creation of new projects.

To do this, this new structure of the laboratory is first and foremost a tool for the dissemination of information and reflection to provide a concerted and coherent response to calls for projects, calls for papers, special issues of journals, etc.

In addition, several options for exchanges will be set up (bibliographic reviews, mini-workshops and internal training).

Finally, this axis plays a role in structuring the laboratory's activity on metamaterials around five main lines :

• Characterization of the properties of acoustic and elastic metamaterials,
• Non-linear metamaterials,
• Mechanical metamaterials,
• Metasurfaces for wave control, in particular for scattering, sub-wavelength absorption, etc.
• metaporous and multi-scale materials for broadband absorption,
• Metaplates and elastic wave control.

The Nonlinear Acoustics transversal axis aims to integrate and promote research across the laboratory's three teams, fostering both internal and transversal collaborations. It serves as a platform for sharing knowledge and tools, coordinating responses to project calls, and facilitating exchanges through bibliographic monitoring, mini-workshops, and in-house training sessions for PhD students and permanent staff.

This axis plays a central role in structuring the laboratory's nonlinear research, focusing on six key themes:

• Nonlinear Mechanical Metamaterials: Investigating the propagation of nonlinear waves, dynamic control of flexible metamaterials, and the emergence of nonlinear topological edge modes.

• High-Amplitude Sound Propagation in Air-Filled Waveguides: Analyzing the effects of acoustic nonlinearities, fluid dynamics, dispersion, and the formation of shock waves and acoustic solitons.

• Bifurcations and Nonlinear Vibrations of Elastic Structures: Studying the onset of buckling, instability, and periodic solutions in nonlinear elastic structures.

• Nonlinear Phenomena in Musical Acoustics: Exploring the role of nonlinearity in sound production by musical instruments, and developing numerical and experimental methods for bifurcation analysis across diverse dynamical systems.

• Non-Destructive Material Characterization Using Nonlinear Methods: Advancing techniques for assessing material properties through nonlinear acoustic signals for improved non-destructive evaluation.

• Transducer Nonlinearities: Developing theoretical models, measurement techniques, and advanced signal processing methods for controlling transducer nonlinearities.