Speaker
Description
Highly non-linear, porous structures stand out by significant changes of their morphology, allowing to control, e.g., their size, shape and acoustic band gaps. A research area that still remains to be fully explored in this exciting class of functional materials is their interaction with pore fluids. For example, the local-flow phenomenon is well studied for rocks, describing a local exchange of pore fluid between adjacent cavities [1,3]. While local flow constitutes the major attenuation mechanism for fluid-filled rocks, it lacks attention for non-linear structures.
We present the influence of non-linear structural deformations on the local-flow mechanism, aiming at the potential of high attenuation at low frequencies. The use of non-linear structures allows to amplify or even trigger local flow [2]. Structures prone to local flow will be discussed and the most efficient geometries will be highlighted in terms of low-frequency attenuation.
References
[1] M. Adelinet, J. Fortin and Y Gueguen (2010): Dispersion of elastic moduli in a porous-cracked rock: Theoretical predictions for squirt-flow, Tectonophysics, 503, 173-181.
[2] T. Cohen, P. Kurzeja and K. Bertoldi (2017): Architected squirt-flow materials for energy dissipation, Journal of the Mechanics and Physics of Solids, 109, 22-33.
[3] B. Quintal, H. Steeb, M. Frehner and S.M. Schmalholz (2011): Quasi‐static finite element modeling of seismic attenuation and dispersion due to wave‐induced fluid flow in poroelastic media, Journal of Geophysical Research, 116, B01201.
| Acceptance of Terms and Conditions | Click here to agree |
|---|
