Non-Linear Matters: Auxetic Surfaces (2017)
article⁄Non-Linear Matters: Auxetic Surfaces (2017)
abstract⁄Auxetic structures exhibiting nonlinear buckling are a prevalent research topic in the material sciences due to the ability to tune their reversible actuation, porosity, and negative Poisson’s ratio. However, the research is limited to feature sizes at scales below 10 mm2, and to date, there are no available efficient design and prototyping methods for architectural designers. Our study develops design principles and workflow methods to transform standard materials into auxetic surfaces at an architectural scale. The auxetic behavior is accomplished through buckling and hinging by subtracting from a homogeneous material to create perforated patterns. The form of the perforations, including shape, scale, and spacing, determines the behavior of multiple compliant ‘hinges’ generating novel patterns that include scaling and tweening transformations. An analytical method was introduced to generate hinge designs in fourfold symmetric structures that approximate nonlinear buckling. The digital workflow integrates a parametric geometry model with nonlinear finite element analysis FEA and physical prototypes to rapidly and accurately design and fabricate auxetic materials. A robotic 6axis waterjet allowed for rapid production while maintaining needed tolerances. Fabrication methods allowed for spatially complex shaping, thus broadening the design scope of transformative auxetic material systems by including graphical and topographical biases. The work culminated in a largescale fully actuated and digitally controlled installation. It was comprised of auxetic surfaces that displayed different degrees of porosity, contracting and expanding while actuated electromechanically. The results provide a promising application for the rapid design of nonlinear auxetic materials at scales complimentary to architectural products.
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| Year |
2017 |
| Authors |
Mesa, Olga; Stavric, Milena; Mhatre, Saurabh; Grinham, Jonathan; Norman, Sarah; Sayegh, Allen; Bechthold, Martin. |
| Issue |
ACADIA 2017: DISCIPLINES & DISRUPTION |
| Pages |
392-403 |
| Library link |
N/A |
| Entry filename |
non-linear-matters |
