U.S. Scientists Develop Material As Strong As Metal But As Light As Foam

Researchers at Johns Hopkins University in the US have developed a new shock-absorbing material that is super lightweight, yet offers the protection of metal. The stuff could make for helmets, armor, and vehicle parts that are lighter, stronger, and, importantly, reusable, Michael Irving reported last week for New Atlas.

Photo Insert: The key to the new material is what are known as liquid crystal elastomers (LCEs), networks of elastic polymers in a liquid crystalline phase that give them a useful combination of elasticity and stability.

The key to the new material is what are known as liquid crystal elastomers (LCEs). These are networks of elastic polymers in a liquid crystalline phase that give them a useful combination of elasticity and stability.

LCEs are normally used to make actuators and artificial muscles for robotics, but for the new study, the researchers investigated the material’s ability to absorb energy. The team created materials that consisted of tilted beams of LCE, sandwiched between stiff supporting structures.

This basic unit was repeated over the material in multiple layers, so that they would buckle at different rates on impact, dissipating the energy effectively.

In a series of experiments, the team tested how well the material could withstand impacts of different masses at different speeds. The materials were struck by objects weighing between 4 and 15 lb (1.8 and 6.8 kg) at speeds of up to 22 mph (35.4 km/h) and, sure enough, they held up.

Perhaps unsurprisingly, the material performed better with more layers of the cells. A structure with four layers, for example, had almost double the energy absorption density of a single-layer structure.

"We are excited about our findings on the extreme energy absorption capability of the new material," said senior author Sung Hoon Kang, an assistant professor of mechanical engineering.

"The material offers more protection from a wide range of impacts, but being lighter could reduce fuel consumption and the environmental impact of vehicles while being more comfortable for protective gear wearers." The research was published in the journal Advanced Materials.

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