A self curling protective structure inspired by armadillos could help soft robots and flexible electronics survive impacts, pressure, and harsh operating conditions.
Researchers at North Carolina State University have developed a bio inspired protective structure that automatically curls into a rigid shell when it detects physical strain or impact. The technology is designed to improve the durability of soft robotics, wearable electronics, and flexible devices that are often vulnerable to damage.
The system, called a morpho interlocking protective module (MIPM), combines flexible materials with a layered mechanical structure that changes shape when triggered. In its normal state, the structure remains lightweight and flexible. When the integrated strain sensor detects touch or pressure, embedded heating layers activate shape changing materials that cause the structure to curl into a protective ball.
The outer layer consists of segmented rigid scales inspired by an armadillo shell, while the internal structure uses interlocking polymer segments that strengthen the system as it folds. Researchers say the design improves mechanical rigidity while maintaining flexibility during normal operation.
The sensing layer combines liquid crystal elastomers, conductive fabrics, silver nanowire based strain sensors, and thermal expansion materials to create an active self protecting mechanism. According to the team, the structure can be tuned to respond to anything from a light touch to stronger impacts.
In testing, the protective structure successfully transformed into a rigid shell after detecting strain, helping shield internal components from external force. Researchers also found that increasing the number of interlocking segments improved structural strength and load resistance.
“In its relaxed state, the structure we’ve developed is fairly flexible, but it can be activated to curve into a rigid external structure,” says Jianyu Zhou, first author of the paper and a postdoctoral researcher at NC State. “We could see this technology being used to protect many types of objects – essentially anything it is capable of curving around.”
