responsive materials; shape transformation; architected materials; programmable materials; mechanical metamaterials; functional materials; 3D printing; additive manufacturing; complex materials
Jin Lishuai, Khajehtourian Romik, Mueller Jochen, Rafsanjani Ahmad, Tournat Vincent, Bertoldi Katia, Kochmann Dennis M. (2020), Guided transition waves in multistable mechanical metamaterials, in Proceedings of the National Academy of Sciences
, 117(5), 2319-2325.
An Ning, Domel August G., Zhou Jinxiong, Rafsanjani Ahmad, Bertoldi Katia (2019), Programmable Hierarchical Kirigami, in Advanced Functional Materials
Rafsanjani Ahmad, Bertoldi Katia, Studart André R. (2019), Programming soft robots with flexible mechanical metamaterials, in Science Robotics
, 4(29), eaav7874-eaav7874.
Design and fabrication of architected materials with programmable shape transformations are central to development of novel functional materials for deployable structures, soft robots, micro devices, reversible encapsulation systems and medical devices. The mechanical response of architected materials can be programmed by harnessing the elastic instabilities embedded in the architecture of their unit cell and can be simply triggered by applying elastic deformations or exposing them to environmental stimuli such as moisture, solvents, temperature or light. In this project, the core idea is to design hybrid architected materials which exploit both elastic instabilities and environmental stimuli to achieve desired functionalities. This combination allows us to design responsive and reconfigurable materials that can reach large deformations and faster actuation. To achieve this goal, a library of 2D and 3D building blocks will be identified for rational design of architected materials with tunable mechanical properties by taking advantage of the vast design space accessible by programming the local composition and particle orientation of composites, introducing structural and compositional gradients, utilizing intricate hierarchical geometric motifs and getting inspiration from origami/kirigami design principles. Along this route, finite element simulations and optimization algorithms will be exploited to predict the response of the materials and improve their functionality. Next, the performance and the response of the designed structures will be identified by conducting table-top experiments on proof-of-concept prototypes fabricated using advanced additive manufacturing techniques. In particular, we explore the state-of-the-art multi-material 3D printing technologies developed in Complex Materials lab and customize these techniques to proposed design concepts. In next steps, the mechanical trigger will be substituted by a stimuli-responsive mechanism e.g. differential swelling to create functional devices which can interact and adapt to changes in their surrounding environment.