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Auxetic Origami Tessellations
Macro Tech-mod
Course: SCI 6477 Nano Micro Macro: Adaptive Material Laboratory (with SEAS)
Instructor: Jonathan Grinham, Joanna Aizenberg
Collaborator: Katrina Armistead
Date: Feb., 2021
Inspiration from specific auxetic origami tessellations led to the development of a novel pattern that harnessed similarly auxetic properties. The resulting output demonstrated a negative Poisson’s Ratio when stretched. Future applications might take advantage of these attributes to enhance structurally reactive behavior.
KEYWORDS:
Non-linearity, Mechanical System, Auxetic Material
OBJECTIVES
The macro-scale is to explore dynamic non-linear mechanical systems. These structures---typically referred to as auxetic- or metamaterials---exhibit novel behaviors, such as buckling, tunable instabilities, or negative Poisson's ratios in response to an applied force.
Concept
Inspiration from specific auxetic origami tessellations led to the development of a novel pattern that harnessed similarly auxetic properties. The resulting output demonstrated a negative Poisson’s Ratio when stretched. Future applications might take advantage of these attributes to enhance structurally reactive behavior.
Tessellations generated from regular planar tilings
Applications
Reference: FREEFORM ORIGAMI TESSELLATIONS BY GENERALIZING RESCH’S PATTERNS
Example designs from star-tuck origami tessellations
Variations of the tuck structures for a regular triangular mesh
Fabrication & Simulation
While no nonlinear behavior was recorded, our mold displayed auxetic behavior under tensile stress. Simulations were conducted with COMSOL under pressure and when stretched. From the second image, the negative Poisson’s ratio is apparent in the expansion of all sides after stretching.
Silicone Casting Mold
COMSOL FEM Analysis
Fabrication Gallery
Instron Testing
Click here to download the full report
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