Projects
Development of Mechanical Programmable Materials
Project description
Programmable materials demonstrate a behavior that can be described by logical elements. This behavior is achieved through a manipulation of the material’s micro- and mesostructure. It is possible to both implement multiple macroscopic properties into a material (e.g. a positive and negative Poisson’s ratio) and to switch between the different states. In my research, I develop and numerically describe such materials.
Project outcomes
My thesis presents the design and categorization of Programmable Materials, from individual unit cells to larger arrays with customized behaviors. Starting with a honeycomb cell with adjustable angles, we created arrays that change shape under specific loads. By adding a stop element, we developed a unit cell with variable stiffness, where shape changes in response to external loading. We also designed a novel unit cell that switches between positive and negative Poisson's ratios, enabling targeted morphing through the material using a stiffness gradient. The Miura-Ori cell, known from origami, was used to create three-dimensional structures with adjustable Poisson’s ratios, allowing precise deformation control. Lastly, we developed a unit cell with temperature-dependent bistability, which can switch between permanent shape change and elastic recovery. Additionally, deformed materials can regain their original shape when heated.
Supervisor and dissertation
Prof. Dr. Chris Eberl
Franziska Wenz successfully defended her dissertation in June 2024.
Dissertation: Design of programmable shape morphing metamaterials