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Active Structures through Auxetics
Auxetic structures possess negative Poisson ratios, i.e. when stretched in one direction, they tend to expand in the other two as well, and vice versa. We aim to exploit this in activating 3d printed multi-material structures.
Keywords: active structures
Auxetic structures have a negative poisson ratio, i.e. when stretch in one direction, it expands in the other directions, and vice versa. Typically, existing auxetic structures are defined by tiling of repeating auxetic unit cells. More recently, homogenization methods have been applied to the optimization of 2D and 3D unit cells, see section 2.10.2 of [1]. Though only one geometry can be generated for a given ratio.
[1] Bendsøe, M. P., & Sigmund, O. (2004). Topology optimization: theory, methods, and
applications.
Auxetic structures have a negative poisson ratio, i.e. when stretch in one direction, it expands in the other directions, and vice versa. Typically, existing auxetic structures are defined by tiling of repeating auxetic unit cells. More recently, homogenization methods have been applied to the optimization of 2D and 3D unit cells, see section 2.10.2 of [1]. Though only one geometry can be generated for a given ratio.
[1] Bendsøe, M. P., & Sigmund, O. (2004). Topology optimization: theory, methods, and applications.
We would like to see if it is possible to convert any convex polyhedron to its re-entrant version and effec-tively reverse its Poisson ratio. Then, we would like to see if auxetic mechanisms may be used in the design of deployable active structures.
The goals include
- Review of 3D auxetic unit cells and tessellations based on their poisson ratio
- Design auxetic cells & tessellations for active structures
- Fabricate and measure the Poisson ratio
- Formulate an optimization problem which maximizes material’s Poisson ratio
We would like to see if it is possible to convert any convex polyhedron to its re-entrant version and effec-tively reverse its Poisson ratio. Then, we would like to see if auxetic mechanisms may be used in the design of deployable active structures.
The goals include
- Review of 3D auxetic unit cells and tessellations based on their poisson ratio
- Design auxetic cells & tessellations for active structures
- Fabricate and measure the Poisson ratio
- Formulate an optimization problem which maximizes material’s Poisson ratio