Elastic Metamaterial Insulator for Broadband Low-Frequency Flexural Vibration Shielding
Résumé
Achieving stop band over broad band at low frequency range has remained a great scientific challenge in spite of various efforts made using metamaterials or other technologies. In this work, we propose a new idea that creates unprecedented stop band for broad band at low frequency range. The dual mechanism of shear stiffening and rotation softening is initiated here to achieve broad stop band at low frequency range. Through analytical, numerical and experimental studies, we reveal the underlying physical mechanism and confirm the effectiveness of this metamaterial on vibration shielding for flexural elastic wave covering 235 to 4520 Hz, which is the broadest one so far. This work opens up a new avenue for the development of elastic metamaterials with unprecedented performances and functionalities that are highly desirable in many fields such as vibration shielding.
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