Tough, Flexible Material Could Protect Astronauts and Soldiers

“The secret behind this material is in the combination and design of hard scales above with soft, flexible tissue below,” says Technion Assistant Professor Stephan Rudykh, pictured here.

A team of researchers has developed a revolutionary material that has superior anti-penetration properties while remaining flexible.

Inspired by the way nature designed fish scales, the material could be used to make bulletproof clothing for the military and space suits that are impervious to micro-meteorites and radiation when astronauts embark on spacewalks. The joint research was conducted at the Technion-Israel Institute of Technology and the Massachusetts Institute of Technology.

A paper outlining the characteristics, test results and applications of the new material was published online on February 20 by the technology journal Soft Matter, a publication of the Royal Society of Chemistry. The research was led by Assistant Professor Stephan Rudykh, head of the Technion’s Mechanics of Soft Materials Laboratory.

“Many species of fish are flexible, but they are also protected by hard scales,” said Prof. Rudykh. “Taking inspiration from nature, we tried to replicate this protecto-flexibility by combining two layers of materials – one soft for flexibility and the other with armor-like scales. The secret behind this material is in the combination and design of hard scales above with soft, flexible tissue below.”

Generally, strength and flexibility are competing properties, explained Prof. Rudykh. You can’t have both. However, the research team found a way to increase the penetration resistance by a factor of 40, while the flexibility of the soft material was reduced by only a factor of five. If the application is, for example, a military uniform for combat, more flexibility can be built into the areas needing flexibility, such as the elbows and knees, while the anti-penetration properties elsewhere, such as in the upper body, can be beefed-up.

“That attribute allows for the fabric to be tailored to the wearer’s body and the environment that the wearer will be facing,” explained Prof. Rudykh, who carried out post-doctoral studies at MIT where he worked with 3-D printing technology before joining the Technion. “This work is part of a revolution in materials properties. Once we can gain control over a material’s micro properties, using 3-D printing we can create materials of an entirely different type, each with the ability to be adjusted to fit the wearer, the need, and the environment.”

Read more: TOUGH, FLEXIBLE MATERIAL COULD PROTECT SOLDIERS & ASTRONAUTS