Publications

2020
Pal A, Bertoldi K, Pham MQ, Schaenzer M, Gross AJ. Optimal turbine blade design enabled by auxetic honeycomb. Smart Materials and Structures. 2020;29 : 125004. [pdf]
Fernandes MC, Aizenberg J, Weaver JC, Bertoldi K. Mechanically robust lattices inspired by deep-sea glass sponges. Nature Materials. 2020.Abstract
The predominantly deep-sea hexactinellid sponges are known for their ability to construct remarkably complex skeletons from amorphous hydrated silica. The skeletal system of one such species of sponge, Euplectella aspergillum, consists of a square-grid-like architecture overlaid with a double set of diagonal bracings, creating a chequerboard-like pattern of open and closed cells. Here, using a combination of finite element simulations and mechanical tests on 3D-printed specimens of different lattice geometries, we show that the sponge’s diagonal reinforcement strategy achieves the highest buckling resistance for a given amount of material. Furthermore, using an evolutionary optimization algorithm, we show that our sponge-inspired lattice geometry approaches the optimum material distribution for the design space considered. Our results demonstrate that lessons learned from the study of sponge skeletal systems can be exploited for the realization of square lattice geometries that are geometrically optimized to avoid global structural buckling, with implications for improved material use in modern infrastructural applications.
[pdf]
Kirigami-Inspired Inflatables with Programmable Shapes
Jin L, Forte AE, Deng B, Rafsanjani A, Bertoldi K. Kirigami-Inspired Inflatables with Programmable Shapes. Advanced Materials. 2020 :2001863. [pdf] [movies]
Bioinspired kirigami metasurfaces as assistive shoe grips
Babaee S, Pajovic S, Rafsanjani A, Shi Y, Bertoldi K, Traverso G. Bioinspired kirigami metasurfaces as assistive shoe grips. Nature Biomedical Engineering. 2020. [pdf] [movies] [abaqus scripts]
Gorissen B, Melancon D, Vasios N, Torbati M, Bertoldi K. Inflatable soft jumper inspired by shell snapping. Science Robotics. 2020;5 :eabb1967. [pdf] [movies]
Librandi G, Tubaldi E, Bertoldi K. Snapping of hinged arches under displacement control: Strength loss and nonreciprocity. Physical Review E. 2020;101 :053004. [pdf] [movies] [matlab code]
Deng B, Chen L, Wei D, Tournat V, Bertoldi K. Pulse-driven robot: Motion via solitary waves. Science Advances. 2020;6 :eaaz1166. [pdf] [movies]
Bar-Sinai Y, Librandi G, Bertoldi K, Moshe M. Geometric charges and nonlinear elasticity of two-dimensional elastic metamaterials. Proceedings of the National Academy of Sciences of the United States of America. 2020. [pdf]
Octopus arm-inspired tapered soft actuators with suckers for improved grasping
Xie Z, Domel AG, An N, Green C, Gong Z, Wang T, Knubben EM, Weaver JC, Bertoldi K, Wen L. Octopus arm-inspired tapered soft actuators with suckers for improved grasping. Soft Robotics. 2020. [pdf] [movies]
Zareei A, Deng B, Bertoldi K. Harnessing transition waves to realize deployable structures. Proceedings of the National Academy of Sciences of the United States of America. 2020. [pdf] [movies]
Medina E, Farrell PE, Bertoldi K, Rycroft CH. Navigating the landscape of nonlinear mechanical metamaterials for advanced programmability. Physical Review B. 2020;101 :064101. [pdf]
Jin L, Khajehtourian R, Mueller J, Rafsanjani A, Tournat V, Bertoldi K, Kochmann DM. Guided transition waves in multistable mechanical metamaterials. Proceedings of the National Academy of Sciences of the United States of America. 2020. [pdf] [movies]
2019
Additive Manufacturing of Nanostructures That Are Delicate, Complex, and Smaller than Ever
Gross AJ, Bertoldi K. Additive Manufacturing of Nanostructures That Are Delicate, Complex, and Smaller than Ever. Small. 2019;15 :1902370. [pdf] [movies]
Programmable Hierarchical Kirigami
An N, Domel AG, Zhou J, Rafsanjani A, Bertoldi K. Programmable Hierarchical Kirigami. Advanced Functional Materials. 2019. [pdf]
Kim SY, Baines R, Booth J, Vasios N, Bertoldi K, Kramer-Bottiglio R. Reconfigurable soft body trajectories using unidirectionally stretchable composite laminae. Nature Communications. 2019;10 :3464. [pdf] [movies]
Deng B, Mo C, Tournat V, Bertoldi K, Raney JR. Focusing and Mode Separation of Elastic Vector Solitons in a 2D Soft Mechanical Metamaterial. Physical Review Letters. 2019;123 :024101. [pdf] [movies]
Deng B, Wang P, Tournat V, Bertoldi K. Nonlinear transition waves in free-standing bistable chains. Journal of the Mechanics and Physics of Solids. 2019. [pdf]
Deng B, Zhang Y, He Q, Tournat V, Wang P, Bertoldi K. Propagation of elastic solitons in chains of pre-deformed beams. New Journal of Physics. 2019;21 :073008. [pdf] [movie] [code]
Vasios N, Gross AJ, Soifer S, Overvelde JTB, Bertoldi K. Harnessing Viscous Flow to Simplify the Actuation of Fluidic Soft Robots. Soft Robotics. 2019 :10.1089/soro.2018.0149. [pdf] [movies]
Guo X, Gusev VE, Tournat V, Deng B, Bertoldi K. Frequency-doubling effect in acoustic reflection by a nonlinear, architected rotating-square metasurface. Physical Review E. 2019;99 :052209. [pdf]

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