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Published July 26, 2016 | Published + Submitted
Journal Article Open

Composite 3D-printed metastructures for low-frequency and broadband vibration absorption


Architected material used to control elastic wave propagation has thus far relied on two mechanisms for forming band gaps, or frequency ranges that cannot propagate: (i) Phononic crystals rely on their structural periodicity to form Bragg band gaps, but are limited in the low-frequency ranges because their unit cell size scales with wavelength; and (ii) Metamaterials overcome this size dependence because they rely on local resonances, but the resulting band gaps are very narrow. Here, we introduce a class of materials, elastic metastructures, that exploit resonating elements to broaden and lower Bragg gaps while reducing the mass of the system. This approach to band-gap engineering can be used for low-frequency vibration absorption and wave guiding across length scales.

Additional Information

© 2016 National Academy of Sciences. Edited by Zhigang Suo, Harvard University, Cambridge, MA, and accepted by Editorial Board Member John A. Rogers June 6, 2016 (received for review January 6, 2016) The authors acknowledge Shi En Kim for performing the measurements of the 3D-printed material properties. This work was partially supported by the ETH Postdoctoral Fellowship to K.H.M., and partially supported by the Swiss National Science Foundation Grant 164375. Author contributions: K.H.M., A.B., and C.D. designed research; K.H.M., A.B., S.K., and A.P. performed research; K.H.M., A.B., A.P., and C.D. analyzed data; and K.H.M. and C.D. wrote the paper. The authors declare no conflict of interest. This article is a PNAS Direct Submission. Z.S. is a guest editor invited by the Editorial Board. This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1600171113/-/DCSupplemental.

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Published - 8386.full.pdf

Submitted - 1511.09465.pdf


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