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  4. Designing Shape Morphing Behavior through Local Programming of Mechanical Metamaterials
 
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2021
Journal Article
Titel

Designing Shape Morphing Behavior through Local Programming of Mechanical Metamaterials

Abstract
Shape morphing implicates that a specific condition leads to a morphing reaction. The material thus transforms from one shape to another in a predefined manner. In this paper, not only the target shape but rather the evolution of the material's shape as a function of the applied strain is programmed. To rationalize the design process, concepts from informatics (processing functions, for example, Poisson's ratio (PR) as function of strain: n = f(e) and if-then-else conditions) will be introduced. Three types of shape morphing behavior will be presented: (1) achieving a target shape by linearly increasing the amplitude of the shape, (2) filling up a target shape in linear steps, and (3) shifting a bulge through the material to a target position. In the first case, the shape is controlled by a geometric gradient within the material. The filling kind of behavior was implemented by logical operations. Moreover, programming moving hillocks (3) requires to implement a sinusoidal function ey = sin (ex) and an if-then-else statement into the unit cells combined with a global stiffness gradient. The three cases will be used to show how the combination of mechanical mechanisms as well as the related parameter distribution enable a programmable shape morphing behavior in an inverse design process.
Author(s)
Wenz, Franziska
Fraunhofer-Institut für Werkstoffmechanik IWM
Schmidt, Ingo
Fraunhofer-Institut für Werkstoffmechanik IWM
Leichner, Alexander
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM
Lichti, Tobias
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM
Baumann, Sascha
Fraunhofer-Institut für Chemische Technologie ICT
Andrae, Heiko
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM
Eberl, Christoph
Fraunhofer-Institut für Werkstoffmechanik IWM
Zeitschrift
Advanced Materials
Funder
Deutsche Forschungsgemeinschaft DFG
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DOI
10.1002/adma.202008617
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Externer Link
Language
English
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Fraunhofer-Institut für Chemische Technologie ICT
Fraunhofer-Institut für Techno- und Wirtschaftsmathematik ITWM
Fraunhofer-Institut für Werkstoffmechanik IWM
Tags
  • homogenization

  • material design

  • mechanical metamateri...

  • Multiscale Simulation...

  • programmable material...

  • shape morphing

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