Person: Hoberman, Chuck
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Hoberman
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Chuck
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Hoberman, Chuck
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Publication A three-dimensional actuated origami-inspired transformable metamaterial with multiple degrees of freedom(Nature Publishing Group, 2016) Overvelde, Johannes T.B.; de Jong, Twan A.; Shevchenko, Yanina; Becerra, Sergio A.; Whitesides, George; Weaver, James; Hoberman, Chuck; Bertoldi, KatiaReconfigurable devices, whose shape can be drastically altered, are central to expandable shelters, deployable space structures, reversible encapsulation systems and medical tools and robots. All these applications require structures whose shape can be actively controlled, both for deployment and to conform to the surrounding environment. While most current reconfigurable designs are application specific, here we present a mechanical metamaterial with tunable shape, volume and stiffness. Our approach exploits a simple modular origami-like design consisting of rigid faces and hinges, which are connected to form a periodic structure consisting of extruded cubes. We show both analytically and experimentally that the transformable metamaterial has three degrees of freedom, which can be actively deformed into numerous specific shapes through embedded actuation. The proposed metamaterial can be used to realize transformable structures with arbitrary architectures, highlighting a robust strategy for the design of reconfigurable devices over a wide range of length scales.Publication Rational design of reconfigurable prismatic architected materials(Springer Nature, 2017) Overvelde, Johannes; Weaver, James; Hoberman, Chuck; Bertoldi, KatiaAdvances in fabrication technologies are enabling the production of architected materials with unprecedented properties. Most such materials are characterized by a fixed geometry, but in the design of some materials it is possible to incorporate internal mechanisms capable of reconfiguring their spatial architecture, and in this way to enable tunable functionality. Inspired by the structural diversity and foldability of the prismatic geometries that can be constructed using the snapology origami technique, here we introduce a robust design strategy based on space-filling tessellations of polyhedra to create three-dimensional reconfigurable materials comprising a periodic assembly of rigid plates and elastic hinges. Guided by numerical analysis and physical prototypes, we systematically explore the mobility of the designed structures and identify a wide range of qualitatively different deformations and internal rearrangements. Given that the underlying principles are scale-independent, our strategy can be applied to the design of the next generation of reconfigurable structures and materials, ranging from metre-scale transformable architectures to nanometre-scale tunable photonic systems.Publication Particle robotics based on statistical mechanics of loosely coupled components(Springer Science and Business Media LLC, 2019-03) Li, Shuguang; Batra, Richa; Brown, David; Chang, Hyun-Dong; Ranganathan, Nikhil; Hoberman, Chuck; Rus, Daniela; Lipson, Hod