![]() “Whereas current approaches to these applications rely on standard mechanics, this technology offers unique advantages such as how it integrates surface and structure, its inherent simplicity of manufacture, and its ability to fold flat.” “This structural system has fascinating implications for dynamic architecture including portable shelters, adaptive building facades and retractable roofs,” said Hoberman. “The opportunities to move all of the control systems onboard combined with new actuation systems already being developed for similar origami-like structures really opens up the design space for these easily deployable transformable structures," said Weaver. The material can be embedded with any kind of actuator, including thermal, dielectric or even water. “We know exactly what we need to actuate in order to get the shape we want.” “We not only understand how the material deforms, but also have an actuation approach that harnesses this understanding,” said Bertoldi. These actuated changes in material properties adds a fourth dimension to the material. As the structure changes shape, it also changes stiffness - meaning one could make a material that’s very pliable or very stiff using the same design. The team connected 64 of these individual cells to create a 4x4x4 cube that can grow, and shrink, change its shape globally, change the orientation of its microstructure and fold completely flat. The team embedded pneumatic actuators into the structure, which can be programmed to deform specific hinges, changing the cube’s shapes and size, and removing the need for external input. The team demonstrated, both theoretically and experimentally, that the cube can be deformed into many different shapes by folding certain edges, which act like hinges. Like origami, the cube can be folded along its edges to change shape. The structure is inspired by an origami technique called snapology, and is made from extruded cubes with 24 faces and 36 edges. Overvelde, graduate student in Bertoldi’s lab and first author of the paper. “We’ve designed a three-dimensional, thin-walled structure that can be used to make foldable and reprogrammable objects of arbitrary architecture, whose shape, volume and stiffness can be dramatically altered and continuously tuned and controlled,” said Johannes T. It is described in Nature Communications. Paulson School of Engineering and Applied Sciences (SEAS), James Weaver, Senior Research Scientist at the Wyss Institute for Biologically Inspired Engineering at Harvard University and Chuck Hoberman, of the Graduate School of Design. ![]() Loeb Associate Professor of the Natural Sciences at the Harvard John A. ![]() The research was lead by Katia Bertoldi, the John L. It can change size, volume and shape it can fold flat to withstand the weight of an elephant without breaking, and pop right back up to prepare for the next task. Harvard researchers have designed a new type of foldable material that is versatile, tunable and self actuated. Imagine a house that could fit in a backpack or a wall that could become a window with the flick of a switch. (Image courtesy of Johannes Overvelde/Harvard SEAS)
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