Abstract:
Aims: Manipulation of low-frequency mechanical waves and vibrations is challenging, yet highly desirable for multiple applications in different engineering fields. This work proposes several three-dimensional configurations of architected materials capable of strongly attenuating or waveguiding waves in broadband low-frequency ranges.
Methods: The design principle of the wave-attenuating meta-materials implies activation of one or several wave scattering mechanisms by changing structural parameters of cellular configurations. The latter are composed of periodic identical cubic blocks and beams. Variations in the beams thickness and inclination angles enables generating extremely broadband band gaps estimated by means of the finite-element method. The wave-guiding meta-materials are obtained by creating an arbitrary curved wave-path represented by unit cells of one of the developed designs inside the other meta-structure.
Results: The proposed approach provides a reliable way to achieve strong omnidirectional mechanical wave attenuation or path-independent waveguiding by means of compact meta-structures. The numerical results are corroborated by a good agreement with experimental measurements on additively manufactures meta-material samples.
Conclusions: The developed approach opens a way to a more general concept to design compact, easy-to-manufacture cellular materials capable of excellently controlling low-frequency waves in broadband regimes. These meta-structures can act as acoustic or mechanical filters, sensors, be used in non-destructive evaluation or other engineering devices.
Acknowledgements: This research is supported by the start-up grants of the FSE at the University of Groningen. The manufacturing of 3D-printed samples by Dr. T.C. Pijper (Philips Drachten, the Innovation Cluster Drachten, The Netherlands) is acknowledged.

Biography: Dr. Anastasiia O. Krushynska is an assistant professor on Dynamics and Vibration at the Engineering and Technology Institute Groningen, University of Groningen (the Netherlands) and a former Marie Sklodowska-Curie Research Fellow (2015-2016) at University of Torino (Italy). With a PhD degree in Mechanics of Deformable Solids from Kyiv National University named after Taras Shevchenko (2008, Ukraine), she worked as a post-doctoral researcher in Ukraine, the Netherlands, and Italy. Her research interests are in the field of wave dynamics, vibrations of elastic solids and acoustics. Since 2013, her research has been focused on acoustic and phononic metamaterials. She has published more than 35 papers in leading international peer-reviewed journals, including Physical Review Letters, Applied Physics Letters, Journal of Mechanics and Physics of Solids, New Journals of Physics, and others, with some of them widely highlighted in the news and press releases. Her research was distinguished by several individual research grants. A.O. Krushynska serves as a review and guest associate editor in the journal “Frontiers in Materials” (Nature Publication Group), a reviewer for 21 international peer-reviewed journals and several international conferences, and an external referee of the European Commission projects.