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Theses

Géométrie et Mécanique des Origamis

Abstract : Origamis are three-dimensional structures obtained by folding a thin sheet following a pre-imprinted pattern of creases. The infinite number of imaginable pattern make the potential for innovation only limited by our understanding of their mechanical properties. This thesis aims to explain how, for a plastic sheet, these properties originate from the competition between the material elasticity and the kinetics conditions imposed on the system. To better understand this equilibrium, the thesis begins by focusing the study on the mechanical response of a single crease, the fundamental components of origamis. In the first chapter, its elastic deformations are captured by a theoretical model supported by simple load-deformation tests and simulations with finite element methods. Then, in the second chapter, the plastic and viscoelastic behavior are analyzed through both an extension of the elastic model and relaxation experiments under controlled strain. Finally, the third part of the thesis is structured around the mechanical study of two patterns of creases. The first one, named “Curved accordion”, showcases the unique shapes obtained by the complex relations between elasticity and geometry. The second pattern generates bistable cylindrical bellows in origami that we use as bases to create an elastic system with binary memory.
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Submitted on : Tuesday, February 2, 2021 - 3:12:15 PM
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  • HAL Id : tel-03128874, version 1

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Théo Jules. Géométrie et Mécanique des Origamis. Mécanique des matériaux [physics.class-ph]. Université de Lyon, 2020. Français. ⟨NNT : 2020LYSEN060⟩. ⟨tel-03128874⟩

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