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Terinspirasi oleh Venus flytrap , para peneliti mengembangkan folding  ' snap  ' geometry

Date:

August 21, 2015

Source:

University of Massachusetts at Amherst

Summary:

Terinspirasi oleh sistim  ' snapping ' alam seperti daun Venus flytrap  dan paruh burung kolibri , sebuah tim ilmuwan telah mengembangkan cara untuk menggunakan lipatan melengkung untuk memberikan kerangka  melengkung tipis cepat , diprogram gerak patah . Teknik baru menghindari kebutuhan untuk material rumit dan metode fabrikasi saat membuat struktur dengan dinamika yang cepat .

................  harus membantu bahan ilmuwan dan insinyur yang ingin merancang struktur yang dapat dengan cepat beralih bentuk dan sifat , kata Santangelo . Dia dan rekan , termasuk ilmuwan polimer Ryan Hayward , menunjukkan bahwa sampai saat ini , belum ada desain aturan geometris umum untuk menciptakan snap antara states  yang stabil dari permukaan “arbitrarily” melengkung ...........more

Inspired by Venus flytrap, researchers develop folding
'snap' geometry

Using curved creases to give thin curved
shells a fast, programmable snapping motion

Date:

August 21, 2015

Source:

University of Massachusetts at Amherst

Summary:

Inspired by natural 'snapping' systems
like Venus flytrap leaves and hummingbird beaks, a team of scientists has
developed a way to use curved creases to give thin curved shells a fast,
programmable snapping motion. The new technique avoids the need for complicated
materials and fabrication methods when creating structures with fast dynamics.

................

Inspired by natural "snapping"
systems like Venus flytrap leaves and hummingbird beaks, a team led by
physicist Christian Santangelo at the University of Massachusetts Amherst has
developed a way to use curved creases to give thin curved shells a fast,
programmable snapping motion. The new technique avoids the need for complicated
materials and fabrication methods when creating structures with fast dynamics.

The advance should help materials
scientists and engineers who wish to design structures that can rapidly switch
shape and properties, says Santangelo. He and colleagues, including polymer
scientist Ryan Hayward, point out that until now, there has not been a general geometric
design rule for creating a snap between stable states of arbitrarily curved
surfaces.

"A lot of plants and animals take
advantage of elasticity to move rapidly, yet we haven't really known how to use
this in artificial devices," says Santangelo. "This gives us a way of
using geometry to design ultrafast, mechanical switches that can be used, for
example, in robots." Details of the new geometry appear in an early online
issue of Proceedings of the National Academy of Sciences.

The authors point out, "While the
well known rules and mechanisms behind folding a flat surface have been used to
create deployable structures and shape transformable materials, folding of
curved shells is still not fundamentally understood." Though the
simultaneous coupling of bending and stretching that deforms a shell naturally
gives items "great stability for engineering applications," they add,
it makes folding a curved surface not a trivial task.

Santangelo and colleagues' paper
outlines the geometry of folding a creased shell and demonstrates the
conditions under which it may fold smoothly. They say the new technique
"will find application in designing structures over a wide range of length
scales, including self-folding materials, tunable optics and switchable frictional
surfaces for microfluidics," such as are used in inkjet printer heads and
lab-on-a-chip technology.

The authors explain, "Shape
programmable structures have recently used origami to reconfigure using a
smooth folding motion, but are hampered by slow speeds and complicated material
assembly." They say the fast snapping motion they developed
"represents a major step in generating programmable materials with rapid
actuation capabilities."

Their geometric design work "lays
the foundation for developing non-Euclidean origami, in which multiple folds
and vertices combine to create new structures," write Santangelo and
colleagues, and the principles and methods "open the door for developing
design paradigms independent of length-scale and material system."







Story Source:

The above post is reprinted from materials provided byUniversity
of Massachusetts at Amherst. Note:
Materials may be edited for content and length.







Journal Reference:

1.   
Nakul Prabhakar Bende, Arthur A. Evans,
Sarah Innes-Gold, Luis A. Marin, Itai Cohen, Ryan C. Hayward, Christian D.
Santangelo. Geometrically controlled snapping transitions in shells
with curved creases. Proceedings of the National Academy of
Sciences, 2015; 201509228 DOI: 10.1073/pnas.1509228112

http://www.sciencedaily.com/releases/2015/08/150821111101.htm

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