Abstract : Discussions on topics related to origami engineering will take place at this mini-symposium. Presenters will present their research aimed at applying the technology of origami, the folding of flat materials to create shapes, to engineering, and exploring the geometric properties of origami from a mathematical perspective to explore its range of applications.
Organizer(s) : Jun Mitani, Sachiko Ishida, Kazuya Saito
[01402] Solitons in Origami / Kirigami Tessellations and Their Underlying Dynamical Systems
Format : Talk at Waseda University
Author(s) :
Rinki Imada (The University of Tokyo)
Tomohiro Tachi (The University of Tokyo)
Abstract : The non-uniform folding of origami/kirigami tessellation, the folding where the configuration of their unit cell isn’t identical, is potentially a great source of nonlinear phenomena. We can mathematically understand these phenomena by the nature of the dynamical systems induced by their geometry.
In this presentation, we report the “soliton-like” phenomenon with the propagation of localized deformation in origami/kirigami tessellations which comes from different mechanisms, i.e., the homoclinic/heteroclinic solutions of their dynamical systems.
[01403] Macroscopic Behavior of Kirigami Tessellations with Contact Surfaces
Format : Talk at Waseda University
Author(s) :
Akito Adachi (The University of Tokyo)
Tomohiro Tachi (The University of Tokyo)
Abstract : Origami and kirigami tessellations with contact surfaces have potential applications including flexible electronics and wearable devices. However, the manufacturing process requires a simultaneous folding of all creases, which makes the pattern difficult to be manufactured. In this study, we reveal the macroscopic behavior of kirigami variations with contact surfaces through singular value decomposition of the kinematic deformation of each module; through this study, we explore the possibility of manufacturing such tessellations by tension-induced buckling.
[01432] Miura fold bending in two directions and their combination
Format : Talk at Waseda University
Author(s) :
Sora Moriyama (The University of Tokyo)
Tomohiro Tachi (The University of Tokyo)
Kuo-chih Chuang (Zhejiang University)
Abstract : For Miura folds, where the unit cell is usually composed of parallelograms, it is known that folds that are not parallel to the row’s direction can be deformed in-plane after folding. If the unit cell is constructed so that it has different angles in the column’s direction, it is deformable out-of-plane after folding. By understanding and combining these mathematically, we will present the Miura fold, which can be deformed in any direction.
[01526] Development study of foldable and portable comfortable acoustic space
Format : Online Talk on Zoom
Author(s) :
Keiko Yamazaki (Meiji University)
Masanori Hashiguchi (KEISOKU ENGINEERING SYSTEM CO., LTD.)
Dahai Mi (KEISOKU ENGINEERING SYSTEM CO., LTD.)
Ichiro Hagiwara (Meiji University)
Abstract : The purpose of our research is to develop a simple sound-reducing shade to enjoy playing music at home. The requirements for the shade are relatively inexpensive, foldable, suitable size and acoustic environment for playing, and most importantly sound dampening ability. Normally, the development of such a product requires many prototypes and verifications, but in this research, by utilizing finite element analysis to find the optimum material and shape without producing a large number of prototypes.
[01562] A remark on the foldability of non-simply connected paper
Format : Talk at Waseda University
Author(s) :
Hiroko Murai (Nara Women's University)
Akari Iwamura (Nara Women's University)
Abstract : It is known that for any simply connected piece of paper $P$,
any flat folded state $(f,\lambda)$ of $P$ is realized by a motion from the unfolded state.
In this talk, we show that the above result does not hold if the paper is not simply connected
and give some examples.
[05414] Origami Structures and Materials: Energy Absorption and Impact Mechanics
Format : Talk at Waseda University
Author(s) :
Guoxing Lu (Swinburne University of Technology)
Abstract : This presentation introduces energy absorption and impact response of origami inspired structures and metamaterial, which we have recently studied. Several examples of incorporating the concepts of origami will be presented. They include thin-walled structures under axial loading, Miura metamaterials and its variations under quasi-static and dynamic compression and origami sandwich panels under quasi-static loading and ballistic impact.
Responses of such materials and structures involve large plastic deformation as well as dynamic effects. For metamaterials, analytical models have been developed to describe the strength and energy absorption capacity. It is assumed that the base material is ductile and can be approximated as a perfectly-plastic material. The analytical model is verified by the numerical simulations as well as quasi-static compression test of a four-sheet origami specimen. Response of such material under impact loading is also investigated and a shock model is proposed for high velocity impact.
[02536] Platonic solids-based optimization for kirigami honeycomb fabrication of complex structures
Author(s) :
Junichi Shinoda (Interlocus CO.LTD)
Keiko Yamazaki (Meiji University)
Ichiro Hagiwara (Meiji University)
Luis Diago (Meiji University)
Abstract : The aerospace, automotive, and marine industries are heavily reliant on sandwich panels with cellular material cores. In this work, a platonic solids-based optimization algorithm has been developed to select the direction of the cells of the kirigami-honeycomb panel with the smallest waste of materials by rotating the 3D solid model of any shape according to the normal vectors in the platonic solids.
[02542] Development of beautifully foldable PET bottles
Author(s) :
Yang Yang (Meiji University)
Chie Nara (Meiji University)
Ichiro Hagiwara (Meiji University)
Abstract : Although many have attempted to develop a PET bottle that is foldable in the axial direction without bending, such bottles are not yet on the market. This is because that although the model with several foldable layers can be folded rather easily without bending, it springs back to almost its original height after compression. Thus, we develop new types of PET bottle with two or three spiral layers to resolve this spring back issue.
