Proof of concept for an ultrasensitive meta-device to detect and localize nonlinear elastic sources

Abstract

The appearance of nonlinear effects in elastic wave propagation is one of the most reliable and sensitive indicators of the onset of material damage. However, these effects are usually very small and can be detected only using cumbersome digital signal processing techniques. Here, we propose and experimentally validate an alternative approach, using the filtering and focusing properties of elastic metamaterials to naturally select the higher harmonics generated by nonlinear effects and to increase their signal-to noise ratios, enabling the realization of time-reversal procedures for nonlinear elastic source detection. The proposed device demonstrates its potential as an efficient, compact, portable, passive apparatus for nonlinear elastic wave sensing and damage detection.

arXiv comment5 figures

References in corpus (2)

• Broadband Acoustic Cloak for Ultrasound Waves
• Slow relaxation and aging phenomena at nano-scale in granular materials

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