Register for updates

 
 

Computers & Technology
RSS Feed
Flexible Building Blocks of the Future
Friday, July 29, 2016 9:30:00 AM

New mechanical "metamaterial" developed at TAU may revolutionize prosthetics and wearable technologies

Ill-fitting joint sockets, contact dermatitis and sebaceous cysts are just a few of the problems plaguing prosthetic patients. They are all a result of the pressure that their prosthetic devices place on the soft tissue of their bodies.

Now researchers at Tel Aviv University, FOM Institute AMOLF and Leiden University in the Netherlands have developed a new approach to manufacturing mechanical "metamaterials" — synthetic composite materials with structures and properties not usually found in natural materials — that can be programmed to deform in a uniquely complex manner.

The breakthrough may have future applications in soft robotics and wearable technologies — and may lead to more close-fitting, comfortable and user-friendly prosthetics. The research was published this week in the journal Nature.

Putting a smile on a cube

Dr. Yair Shokef of TAU's School of Mechanical Engineering and Prof. Martin van Hecke of Leiden University and AMOLF, the Netherlands, illustrated their approach through a three-dimensional printing of a metamaterial cube. A smiley-face pattern emerged on the side of the cube when it was compressed between custom-patterned surfaces.

To demonstrate that any pattern can be produced on a cube's surface, the 
researchers developed a cube of 10x10x10 centimeter blocks
on which a smiley appears when the cube is compressed.
Photo: Corentin Coulais.

"We started with a series of flexible building blocks, or bricks, that had deformation properties that varied with their position," said Dr. Shokef. "The blocks were able to change their shape when we applied pressure. From there, we were able to develop a new design principle to enable these bricks to be oriented and assembled into a larger metamaterial with machine-like functionalities."

The metamaterial has the unusual property that spatially-patterned compression in one direction leads to predictable spatially-patterned deformation (dents and protrusions) in other directions.

"A pattern of specific bulges appears when our seemingly normal cube is compressed," said Dr. Shokef. "Using metamaterials, we can 'program' the material's behavior by carefully designing its spatial structure."

"For example, a pattern of holes in a sheet of material produces a mechanical response that is completely different than in the same material without holes," said Prof. van Hecke. "We also wanted to investigate this phenomenon for a three-dimensional pattern of holes."

One cube atop another

The researchers calculated the number of possible stacks for different cubes of building blocks. They then developed a cube of 10x10x10 centimeter blocks on which a smiley face appears when the cube is compressed. This demonstrated that any given pattern can be produced on a cube's surface.

"For each possible stack, the deformation within the cube results in a specific pattern on the sides of the cube," said Dr. Shokef. "We can carefully combine the building blocks in a way that any desired pattern can appear on the sides of a compressed cube. We can also use the cube to analyze these patterns."

There are many applications on the horizon for this new basic research. "This type of programmable 'machine material' could be ideal for prostheses or wearable technology in which a close fit with the body is important," Dr. Shokef said. "If we can make the building blocks even more complex or produce these from other materials, the possibilities really are endless."

Explanatory video:
http://vimeo.com/173274940
https://www.youtube.com/watch?v=NxcCtimWxn0




Latest News

"Robat" Uses Sound to Navigate and Map Unique Environments

New robot mimics bats' ability to employ sonar to navigate its surroundings, TAU researchers say.

Smartphones May Be Used to Better Predict the Weather

Data could be harnessed to forecast flash floods and other natural disasters, TAU researchers say.

Genome Analysis of 6,500-Year-Old Human Remains in Israeli Cave Points to Origin of Ancient Chalcolithic Culture

Skeletons buried in Israel's Upper Galilee reveal migration from ancient Turkey and Iran, TAU researchers say.

Shmunis Family Anthropology Institute Opens at TAU’s Steinhardt Museum of Natural History

Institute's cutting-edge technology provides new tools for research into the origin and development of modern humans.

In Neutron Stars, Protons May Do the Heavy Lifting

New TAU/MIT/ODU study finds that a small fraction of protons in neutron-dense objects can significantly impact their properties.

Microscale Superlubricity Could Pave Way for Future Improved Electromechanical Devices

Discovery may lead to more robust computer hard discs, TAU and Tsinghua University researchers say.

New Study Offers Hope of Recovery from Spinal Cord Injury

Novel enzyme treatment may reduce inflammation and scarring that prevent neuronal regeneration, TAU researchers say.

Link Found Between Resilience to Dyslexia and Gray Matter in the Frontal Brain

High density of neurons in frontal cortex important for successful reading, TAU researchers say.

Brain Arousal Compound Noradrenaline Plays Critical Role in Sensory Perception

Discovery paves way for detecting situations of dangerous lapses and for improving anesthesia protocols, TAU researchers say.

Compounds Found in Green Tea and Wine May Block Formation of Toxic Metabolites

Discovery may pave the way for therapies to treat inborn congenital metabolic disorders, TAU researchers say.

contentSecondary
c

© 2018 American Friends of Tel Aviv University
39 Broadway, Suite 1510 | New York, NY 10006 | 212.742.9070 | info@aftau.org
Privacy policy | Tel Aviv University