3D printing increasingly has the potential to generate unique experiences on an individual level by empowering consumers to use or create products in new ways. Instead of being beholden to the designs or intentions of a generalized product, buyers will soon have the ability to tailor products to their specific needs.
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.
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 . Though only one geometry can be generated for a given ratio.
 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
design duo Kram/Weisshaar used custom software to adapt and strengthen the branch-like metal joints of this collection of 3D printed furniture, currently on show at the Istanbul Design Biennial
By 3D printing lots of small pieces that can be combined, Gershenfeld and Kenneth Cheung built a composite material that’s up to 10 times stiffer than existing ultralight materials. The structure is made up of cross-shaped pieces into “a cubic lattice of octahedral cells, a structure called a “cuboct” — which is similar to the crystal structure of the mineral perovskite.” Because it’s assembled, it can be disassembled. That means it can be repaired or rearranged. Gershenfeld and Cheung are working to develop robots that can traverse the structures and assemble them.
Whilst 3D printing is most commonly used for prototyping, the production of end products is rapidly increasing. This project intended to use 3D printing as a viable mean of production for furniture.
The final algorithm allows the creator to design a wire-frame, this is then used as an input from which it can generate the nodes based on the diameter of the materials used. This makes it a very efficient process for the fabrication of structures of any sizes and shapes.
The final pieces are built using carbon rods bonded to 3D printed nylon nodes.
AN EVOLUTION OF THE PROTOTYPES PRESENTED IN 2012, THESE 3D PRINTED CONNECTORS, THAT CAN CREATE VARIOUS FURNITURE PIECES BY INSERTING SIMPLE BEAMS HAVE BEEN OPTIMIZED IN VARIOUS WAYS. THE ADDITIONAL PARTS CAN BE SIMPLE BEAMS CUT TO SIZE, THE ANGLES ARE CHOSEN TO ACCOMMODATE A VARIETY OF SIZES FOR EACH GIVEN FURNITURE PIECE AND THE STRUCTURE OF THE CONNECTORS HAS BEEN OPTIMIZED FOR STRENGTH AND MATERIAL SAVINGS