In Press
Wang P, Zheng Y, Fernandes MC, Sun Y, Xu K, Sun S, Kang SH, Tournat V, Bertoldi K. Harnessing Geometric Frustration to Form Band Gaps in Acoustic Networks. Physical Review Letters. In Press.Abstract

We demonstrate both numerically and experimentally that geometric frustration in two-dimensional periodic acoustic networks consisting of arrays of narrow air channels can be harnessed to form  band gaps (ranges of frequency in which the waves cannot propagate in any direction through the system). While resonant standing wave modes and interferences are ubiquitous in all the analyzed network geometries, we show that they give rise to band gaps only in the geometrically frustrated ones (i.e. those comprising of triangles and pentagons). Our results not only reveal a new mechanism based on geometric frustration to suppress the propagation of pressure waves in specific frequency ranges, but also opens avenues for the design of a new generation of smart systems that control and manipulate sound and vibrations.

Wang Z, Polygerinos P, Overvelde JTB, Galloway KC, Bertoldi K, Walsh CJ. Interaction Forces of Soft Fiber Reinforced Bending Actuators. IEEE/ASME Transactions on Mechatronics. 2017. [pdf]
Overvelde JTB, Weaver JC, Hoberman C, Bertoldi K. Rational design of reconfigurable prismatic architected materials. Nature. 2017;541 :347-352. [pdf] [movies] [matlab code] [News&Views]
Connolly F, Walsh CJ, Bertoldi K. Automatic design of fiber-reinforced soft actuators for trajectory matching. Proceedings of the National Academy of Sciences of the United States of America. 2017;114 :51-56. [pdf] [movies]
Babaee S, Overvelde JTB, Chen ER, Tournat V, Bertoldi K. Reconfigurable origami-inspired acoustic waveguides. Science Advances. 2016;2 :e1601019. [pdf] [movies]
Taylor M, Gozen I, Patel S, Jesorka A, Bertoldi K. Peridynamic Modeling of Ruptures in Biomembranes. PLOS ONE. 2016. [pdf]
Lauder GV, Wainwright DK, Domel AG, Weaver JC, Wen L, Bertoldi K. Structure, biomimetics, and fluid dynamics of fish skin surfaces. Physical Review Fluids. 2016;1 :060502. [pdf]
Raney J, Nadkarni N, Daraio C, Kochmann DM, Lewis JA, Bertoldi K. Stable propagation of mechanical signals in soft media using stored elastic energy. Proceedings of the National Academy of Sciences of the United States of America. 2016. [pdf]
Overvelde JTB, Dykstra DMJ, de Rooij R, Weaver J, Bertoldi K. Tensile Instability in a Thick Elastic Body. Physical Review Letters. 2016. [pdf]
Javid F, Liu J, Shim J, Weaver JC, Shanian A, Bertoldi K. Mechanics of instability-induced pattern transformations in elastomeric porous cylinders. Journal of the Mechanics and Physics of Solids. 2016;96 :1-17. [pdf]
Zárate Y, Babaee S, Kang SH, Neshev DN, Shadrivov IV, Bertoldi K, Powell DA. Elastic metamaterials for tuning circular polarization of electromagnetic waves. Scientific Reports. 2016;6 :28273. [pdf]
Liu J, Gu T, Shan S, Kang SH, Weaver J, Bertoldi K. Harnessing buckling to design architected materials that exhibit effective negative swelling. Advanced Materials. 2016. [pdf]
Javid F, Wang P, Shanian A, Bertoldi K. Architected Materials with Ultra-Low Porosity for Vibration Control. Advanced Materials. 2016. [pdf]
Overvelde JTB, de Jong TA, Shevchenko Y, Becerra SA, Whiteside G, Weaver JC, Hoberman C, Bertoldi K. A three-dimensional actuated origami-inspired transformable metamaterial with multiple degrees of freedom. Nature Communications. 2016;7 :10929. [pdf] [movies]
Harnessing Deformation to Switch On and Off the Propagation of Sound
Babaee S, Viard N, Wang P, Fang NX, Bertoldi K. Harnessing Deformation to Switch On and Off the Propagation of Sound. Advanced Materials. 2016;8 :1631-1635. [pdf] [cover]
Yang D, Jin L, Martinez RV, Bertoldi K, Whitesides GM, Suo Z. Phase-transforming and switchable metamaterials. Extreme Mechanics Letters. 2016;6 :1-9. [pdf]
Liu J, Su T, Wicks N, Pabon J, Bertoldi K. The Instability Mechanism of a Confined Rod Under Axial Vibrations. Journal of Applied Mechanics. 2016;83 :011005-1-10. [pdf]
Pouya C, Overvelde JTB, Kolle M, Aizenberg J, Bertoldi K, Weaver JC, Vukusic P. Characterization of a Mechanically Tunable Gyroid Photonic Crystal Inspired by the Butterfly Parides Sesostris. Advanced Optical Materials. 2016;4 :99-105. [pdf]
Liu J, Bertoldi K. Bloch wave approach for the analysis of sequential bifurcations in bilayer structures. Proceedings of the Royal Society A. 2015;471 :20150493. [pdf]
Babaee S, Shahsavari AS, Wang P, Picu RC, Bertoldi K. Wave propagation in cross-linked random fiber networks. Applied Physics Letters. 2015;107 :211904. [pdf]