Mueller J, Lewis JA, Bertoldi K. Architected Multimaterial Lattices with Thermally Programmable Mechanical Response. Advanced Functional Materials. 2021 :2105128. [pdf]
Bell MA, Gorissen B, Bertoldi K, Weaver JC, Wood RJ. A Modular and Self-Contained Fluidic Engine for Soft Actuators. Advanced Intelligent Systems. 2021 :2100094. [pdf]
Jin L, Forte AE, Bertoldi K. Mechanical Valves for On-Board Flow Control of Inflatable Robots. Advanced Science. 2021 :2101941. [pdf] [movies]
Fernandes MC, Saadat M, Cauchy-Dubois P, Inamura C, Sirota T, Milliron G, Haj-Hariri H, Bertoldi K, Weaver JC. Mechanical and hydrodynamic analyses of helical strake-like ridges in a glass sponge. Journal of the Royal Society Interface. 2021;18 :20210559. [pdf]
Li S, Librandi G, Yao Y, Richard AJ, Schneider-Yamamura A, Aizenberg J, Bertoldi K. Controlling Liquid Crystal Orientations for Programmable Anisotropic Transformations in Cellular Microstructures. Advanced Materials. 2021 :2105024. [pdf] [movies]
Jia Z, Fernandes MC, Denga Z, Yanga T, Zhang Q, Lethbridge A, Yin J, Lee J-H, Han L, Weaver JC, et al. Microstructural design for mechanical–optical multifunctionality in the exoskeleton of the flowerbeetle Torynorrhina flammea. Proceedings of the National Academy of Sciences of the United States of America. 2021;118 :e2101017118. [pdf]
Librandi G, Tubaldi E, Bertoldi K. Programming nonreciprocity and reversibility in multistable mechanical metamaterials. Nature Communications. 2021;12 :3454. [pdf] [movies]
Deng B, Ranei JR, Bertoldi K, Tournat V. Nonlinear waves in flexible mechanical metamaterials. Journal of Applied Physics. 2021;130 :040901. [pdf]
Deployable Structures Based on Buckling of Curved Beams Upon a Rotational Input
Mhatre S, Boatti E, Melancon D, Zareei A, Dupont M, Bechthold M, Bertoldi K. Deployable Structures Based on Buckling of Curved Beams Upon a Rotational Input. Advanced Functional Materials. 2021 :2101144. [pdf] [movies]
Melancon D, Gorissen B, García-Mora CJ, Hoberman C, Bertoldi K. Multistable inflatable origami structures at the metre scale. Nature. 2021;592 :545-551. [pdf] [movies]
Li S, Deng B, Grinthal A, Schneider-Yamamura A, Kang J, Martens RS, Zhang CT, Li J, Yu S, Bertoldi K, et al. Liquid-induced topological transformations of cellular microstructures. Nature. 2021;592 :386-391. [pdf] [movies]
Zareei A, Medina E, Bertoldi K. Harnessing Mechanical Deformation to Reduce Spherical Aberration in Soft Lenses. Physical Review Letters. 2021;126 :084301. [pdf] [movies]
Aktaş B, Narang YS, Vasios N, Bertoldi K, Howe RD. A Modeling Framework for Jamming Structures. Advanced Functional Materials. 2021 :2007554. [pdf]
Vasios N, Deng B, Gorissen B, Bertoldi K. Universally bistable shells with nonzero Gaussian curvature for two-way transition waves. Nature Communications. 2021;12 :695. [pdf]
Deng B, Li J, Tournat V, Purohit PK, Bertoldi K. Dynamics of mechanical metamaterials: A framework to connect phonons, nonlinear periodic waves and solitons. Journal of the Mechanics and Physics of Solids. 2021;147 :104233. [pdf]
O’Neill CT, McCann CM, Hohimer CJ, Bertoldi K, Walsh CJ. Unfolding Textile-Based Pneumatic Actuators for Wearable Applications. Soft Robotics. 2021. [pdf]
Deng B, Yu S, Forte A, Tournat V, Bertoldi K. Characterization, stability, and application of domain walls in flexible mechanical metamaterials. Proceedings of the National Academy of Sciences of the United States of America. 2020. [pdf] [movies]
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.
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]