2021/12/16 by Sawyer Thomas, Thomas, Sawyer, Jeffrey Lipton +1
Computer Science · Engineering · #Advanced Materials and Mechanics #Advanced Sensor and Energy Harvesting Materials #FOS: Computer and information sciences #Modular Robots and Swarm Intelligence #Robotics (cs.RO) #cs.RO
paper · pdf · doi:10.48550/arxiv.2112.08597
arxiv created 2021/12/16 · openalex publication_date 2021/12/16 · arxiv updated 2021/12/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The ability to change a surface's profile allows biological systems to effectively manipulate and blend into their surroundings. Current surface morphing techniques rely either on having a small number of fixed states or on directly driving the entire system. We discovered a subset of scale-independent auxetic metamaterials have a state trajectory with a star-graph structure. At the central node, small nudges can move the material between trajectories, allowing us to locally shift Poisson's ratio, causing the material to take on different shapes under loading. While the number of possible shapes grows exponentially with the size of the material, the probability of finding one at random is vanishingly small. By actively guiding the material through the node points, we produce a reprogrammable surface that does not require inputs to maintain shape and can display arbitrary 2D information and take on complex 3D shapes. Our work opens new opportunities in micro devices, tactile displays, manufacturing, and robotic systems.