Reprogrammable mechanical metamaterials via passive and active magnetic interactions

Abstract

This study experimentally demonstrates the reprogrammability of a rotating-squares-based mechanical metamaterial with an embedded array of permanent magnets. How the orientation, residual magnetization, and stiffness of the magnets influence both the static and dynamic responses of the metamaterial is systematically investigated. It is showed that by carefully tuning the magnet orientation within the metamaterial, notable tunability of the metamaterial response can be achieved across static and dynamic regimes. More complex magnetic node configurations can optimize specific structural responses by decoupling the tunability of quasi-static stress-strain behavior from energy absorption under impact loading. Additionally, reprogrammability can be further enhanced by an external magnetic field, which modulates magnetic interactions within the structure. This work paves the way for developing engineered structural components with adaptable mechanical responses, reprogrammable through either the redistribution of magnetic elements or the application of an external magnetic field.The authors acknowledge support from Ministerio de Ciencia e Innovacion MCIN/AEI/10.13039/501100011033 under Grant number PID2020- 117894GA-I00, the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement No. 947723, project: 4D-BIOMAP), and the Catedra UC3M–NAVANTIA– MONODON: DEEPTECH. G.R. acknowledges the Swiss National Science Foundation for funding the project. Project: Metamaterials with reprogrammable shape and stiffness (grant no.: 217901)