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 . Structures prone to local flow will be discussed and the most efficient geometries will be highlighted in terms of low-frequency attenuation.
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