ABSTRACT
In recent years, the call for multi-functional structural systems has increased substantially, with potential applications across scales: from deployable outer space structures [1], [2], to transformable multi-role robots [3], [4], and to microstructures of metamaterials [5]–[7]. To achieve various functionalities, the system has to be able to change their behavior on demand, which usually involves programmable physical states, such as geometry, and stress distribution. Some art forms turn out to embed the potential to become multi-functional structural systems. In this thesis, we focus on origami and tensegrity, due to their aesthetic elegance and direct reconfigurability and programmability. In order to position the present work in terms of its contributions, precise definitions associated to origami and tensegrity are needed. Those definitions are provided in italics in this introductory chapter, which set the basis for the remainder of the thesis. Indeed, both origami and tensegrity are not only deeply rooted in art [8]–[10], but also found in nature under various forms [11]–[14], implying their potentially superior performance as multi-functional platforms. Compared to other reconfigurable and programmable structural systems, such as membranes and truss frames, the present understanding of origami and tensegrity is still limited and thus there is room for further investigation, innovation, and creativity. This thesis investigates how we can apply origami and tensegrity designs to achieve programmable geometries and mechanical properties for applications involving structures and metamaterials, and thus provide insight on rational design of such systems. In this thesis, we refer to “structures” as stand-alone platforms consisting of a finite assembly of organized elements, such as bridges, robots, and shelters. We define “metamaterials” as artificial materials with engineered microstructure that exhibit unconventional properties 1 compared to natural materials. The key concept here is that we can obtain desired and predictable mechanical behavior and geometry by varying the system designs according to certain rules, and hence achieving programmability.
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