&ball; Physics 12, 44
A folding model produces a metamaterial with properties that can be adjusted over a wide range.
The origami is not just for making paper sculptures; Engineers develop origami-inspired structures that unfold in space and in blood vessels. Researchers led by Glaucio Paulino of Georgia Institute of Technology in Atlanta have demonstrated a new folding model that produces a 2D material whose mechanical properties can be set over a wide range. The periodic folding pattern consists of a network of folds, some of which can produce a "mountain ridge" or "valley", depending on how they bend. The passage of a fold from one mountain to another causes a modification of the Poisson's ratio, which describes the degree of shrinkage of a material in a direction along a perpendicular direction. Researchers could adopt a complete switch to all reversible folds, transforming the material from a positive Poisson ratio (egg box mode) to a negative mode ratio (Miura mode). They can also switch to the selected rows of the model, resulting in a hybrid fold.
Hybrid folds could lead to structures with a new level of versatility, says Paulino. For example, some concert halls have adjustable acoustic origami structures to control the projection of sound. With a greater variety of configurations, such structures could provide a more personalized musical experience. Paulino is also interested in designing an origami-based drone accident protection system that could be modified depending on flight conditions.
This research is published in Letters of physical examination.
David Ehrenstein is the focus editor for Physics.