In light of the growing interest in Kresling origami-inspired structures and the immense potential that Polyjet (PJ) 3D printing technique offers, this thesis delves into fully harnessing the remarkable characteristics of 3D printed PJ Kresling architected materials, such as tunable energy absorption and multi-stable states. Initially, a quantitative review of the achieved mechanical performance of PJ architected materials in the context of Ashby charts was developed. Subsequently, the manufacturing limitations of PJ were assessed to then determine geometrical safe margins for accurate printing and reducing defects, as well as the estimated total cost of 3D printed PJ structures in the actual market context. Furthermore, the material characterization of a group of rigid and flexible PJ photo-polymers was conducted to define their mechanical properties and establish accurate constitutive models. Additional effects on the final stiffness, such as aging and surface finishing were also determined. The main focus of this thesis lies not only on theoretical conceptualization but also on the practical fabrication of PJ Kresling architected materials prototypes. The crucial role of their creases geometry and the visco-elastic effects related to PJ photo-polymers, were analyzed numerically and experimentally, aiming to achieve multistability and tunable energy landscapes. Hence, this analysis extends the obtained geometrical and material design hints to mono-material printing and micro-fabrication. Therefore, this work contributes to advancing our understanding of 3D printed Kresling-inspired materials, fostering their application in realistic scenarios, and propelling innovations in scalable devices by overcoming fabrication challenges.

Thesis (M. Ed.)--University of Hong Kong, 2005. / Title proper from title frame. Also available in printed format.

Orientador: Milton Koji Nakata / Banca: Cassia Leticia Carrara Domiciano / Banca: Paulo Kawauchi / Resumo: A presente pesquisa busca investigar o papel científico e projetual que o origami, arte de dobrar papel, está desempenhando globalmente e como o design de dobras pode contribuir para o processo criativo e às inovações tecnológicas. Para tal, são consideradas três principais vertentes: 1) investigar o estado da arte do origami, desde o seu surgimento histórico até a evolução cronológica de pesquisa científica, processos de comunicação e segmentos estéticos; 2) analisar diferentes publicações do design do origami, as técnicas envolvidas e áreas de atuação; 3) desenvolver estudos de caso em prototipagem baseados no material estudado. Através do método indutivo-confirmável, o estudo possui dois momentos: pesquisa teórica bibliográfica e pesquisa prática experimental. O estudo teórico baseia-se na leitura e seleção de artigos de periódicos, publicações de congressos e livros que elucidem as diferentes possibilidades de ação projetual das dobraduras como a técnica do crease pattern e as vertentes do design de origami adaptado. O estudo experimental trata-se da construção de protótipos para a comprovação prática das técnicas e segmentos estudados. O objetivo de pesquisa está na compreensão da importância do design de origami em diferentes áreas do conhecimento teórico e aplicado e como as dobraduras são reapropriadas para gerar novas formas de construção e modelagem com os materiais e estruturas. Busca-se uma contribuição geral no sentido de solidificar mais e melhor os conceitos e ... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The present research aims to investigate the projetual and scientific role that origami, folding paper art, is performing globally and how folds design can contribute to the creative process and to technological innovations. To this end, three main aspects are considered: 1) to investigate the state of origami's art, from its historical emergence to the chronological evolution of scientific research, communication processes and aesthetic segments; 2) analyze different publications of origami design, the techniques involved and acting areas; 3) to develop case studies with prototyping based on the material studied. Through the inductive-confirmatory method, this study has two moments: theoretical bibliographic research and practical experimental research. The theoretical study is based on reading and selection of articles from journals, congress publications and books that elucidate the different possibilities of folds design as crease pattern technique and origami-adapted design. The experimental study is based on prototypes construction for practical verification of techniques and segments studied. The research objective is to understand the importance of origami design in different areas of theoretical and applied knowledge, and how foldings are reappropriated to generate new forms of construction and modeling with materials and structures. A general contribution is considered to solidify more and better the concepts and researches with origami design in Brazil. / Mestre

Origami has been investigated and demonstrated for engineering applications in recent years. Many techniques for accommodating the thickness of most engineering materials have been developed. In this work, tables comparing performance and manufacturing characteristics are presented. These tables can serve as useful design tools for engineers when selecting an appropriate thickness-accommodation technique for their application. The use of bent sheet metal for panels in thick-origami mechanisms shows promise as a panel design approach that mitigates several trade-offs between performance and manufacturing characteristics. A process is described and demonstrated that can be employed to use sheet metal in designs of origami-adapted mechanisms that utilize specific thickness-accommodation techniques. Data structures based on origami can be useful in the automation of thick-origami mechanism design. The use of such data structures is explained and shown in the context of a program that will automatically create the 3D CAD models and assembly of a thick-origami mechanism using the tapered panels technique based on the input origami crease pattern. Manufacturability in the design of origami-adapted mechanisms is discussed through presenting and examining three examples of origami-adapted mechanisms. As the manufacturability of origami-adapted products is addressed and improved, their robustness will also improve, thereby enabling greater use of origami-adapted design.

Origami, the art of folding paper, was once only an art form. In recent years, it has collided with the world of engineering and is acting as a source of inspiration for solutions to various engineering problems. Paper, the typical material used in the art form, is thin and works well for origami, but is not often suitable for use in engineering. Researchers have developed a handful of methods for accommodating thick/rigid materials in origami design. Most of these preserve only the kinematics of the model or its range of motion. Not only does the offset panel technique (OPT) preserve both the kinematics and the range of motion, it also allows for flexibility in design. This work focuses on the further development of the OPT and its potential to be implemented in real-world applications. The OPT provides design flexibility by allowing for the use of various and multiple materials, the modification of panel geometry, and the utilization of any rigid-foldable origami pattern. These and other capabilities are demonstrated in several application examples.

Thesis (M.F.A.)--Rochester Institute of Technology, 1992. / Typescript. Includes bibliographical references (leaf 56).

The purpose of this thesis is to develop a system for folding an origami model using computer generated, or virtual, paper. This research is detailed according to both the creative and technical aspects of that process, with particular attention given to formulating a solution for animating the paper in a way that is physically realistic. The project is executed in Autodesk Maya, a 3D computer graphics program, and rendered with mental ray, a production quality rendering software. The final results are illustrated via excerpts from When Pigs Fly…, an original 3D short which uses the developed methodology to give life to an origami-based narrative. The techniques employed in this thesis can provide a valuable framework for other artists embarking on similar productions and supply a foundation for more advanced problems related to folding and computer graphics.

This report examines the mathematics of paper folding. One can solve cubic polynomials by folding a common tangent to two distinct parabolas. This then leads to constructions that cannot be done with a straightedge and compass such as angle trisection and doubling a cube. / text

Thesis (Master)--İzmir Institute of Technology, İzmir, 2004 / Includes bibliographical references (leaves. 115).

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