Origami-based structures have been used to create deployable solar arrays for space, adaptive acoustic systems for symphony halls, and even crash protection systems for flying drones.
Now, researchers at the Georgia Institute of Technology have created a new type of origami that can be transformed from a pattern into a different one, or even into a hybrid of two patterns, instantly altering many of its structural characteristics.
The research, which was supported by the National Science Foundation and will be published on April 19 in the journal. Physical revision letters, could unlock new types of structures based on origami or metamaterials that take advantage of the characteristics of two types of origami.
"This hybrid origami allows reprogrammable mechanical properties and the ability to change those properties while the material is in service," said Glaucio Paulino, a professor at the School of Civil and Environmental Engineering at Georgia Tech.
The researchers started with two types of origami patterns: the Miura-ori and the eggbox, which can be formed into repetitive pattern sheets. The Miura-ori looks like rows of folded zigzags, while the pattern of the egg box resembles a mountain range with peaks and valleys that repeat themselves.
Both are able to compress in a very small space, but when they expand they behave differently to each other in the way they respond to flexion. The pattern of the egg box resembles a dome when it is folded, and the Miura-ori takes the form of a saddle.
"Traditionally, if you have an egg-box pattern, you're stuck in the characteristics of that particular pattern," said Paulino, who is also the President of Engineering Raymond Allen Jones at the School of Civil and Environmental Engineering. "With this new pattern, which we call morph, that is no longer the case."
The new origami pattern achieves its transformation capacity by redesigning the geometry of two of the four planes that form a section of origami. By contracting those two planes on one side, it allows its folds to move from a mountain to a valley, or in other words, to bend in the opposite direction.
And, more importantly, the peak-to-valley transition can occur if origami is formed from a flexible material such as paper or a rigid material such as metal.
That means, for example, that the origami-based structures used for acoustic systems, which are already capable of expanding and contracting to increase or decrease the volume of the sound response, could go a step further, changing the way in which they lean to offer a uniform balance. Greater range of resonant responses. In the example of the protection system against crashes with unmanned aircraft, the new origami pattern could offer other personalization options or alter aspects of its impact resistance, Paulino said.
"NSF's investments in fundamental research in architectural materials have pushed the boundaries and created" shape-shifting "structures for applications in space exploration, robotics and medicine," said Robert B. Stone, director of the Civil Innovation division. , Mechanical and Manufacturing of NSF.
The new origami pattern is also capable of adopting a hybrid structure, where certain rows bend in one configuration and others bend in the other. In such a configuration, the structure would exhibit characteristics of both types.
"There are a lot of combinations in terms of how they could be configured, which offers many customization possibilities for structures based on the transformation pattern," said Ke Liu, a former graduate student at Georgia Tech and now a postdoctoral fellow at The Tech. California Institute of Technology.
Another unique feature of the variation pattern is what happens when a Miura-ori row is located between two eggbox rows. Normally, when tension is applied to separate any of the patterns, they respond by yielding and flattening their shape. However, in this new instance, the Miura-ori pattern is blocked in its place.
"The blockade is very strong, and there is no other way to break that hold than tear the entire structure," said Phanisri Pratapa, a former postdoctoral fellow at Georgia Tech and now an badistant professor of civil engineering at the Indian Institute of India. Madras technology.
The blockade could allow the structures to limit the amount of expansion possible and change that limit on the fly, said Pratapa.
Origami that changes shape could help antenna systems adapt on the fly
Phanisri P. Pratapa, Ke Liu, Glaucio H. Paulino, "Geometrical mechanics of origami patterns that exhibit a change in Poisson's ratio by breaking the Mountain / Valley badignment" Physical revision letters, April 2019. journals.aps.org/prl/accepted/… d44b4b51c80e817c6a70
Origami morphing takes a new form, expanding the possibilities of use (2019, April 17)
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