THE DESIGN, ANALYSIS AND CRASHWORTHINESS OF AN ORIGAMI-INSPIRED STRUCTURE

Origami, the art of paper folding, is often associated with Japanese culture. Implementing- ing origami into products that make lives easier and that achieve desirable attributes is the main aim of the origami-adapted design process. A thin-walled tube such as a trapezoid origami crash box is one such energy absorption device derived from origami. The surface of this tube is pre-folded to develop an origami pattern that is delicately designed which gives rise to an interesting- ing structure on the surface of a square tube. Geometric, compliance, and comparative analysis are made and the two extreme designs, Trapezoidal and Diamond origami crash boxes are compared for their energy absorption capability.

THE DESIGN, ANALYSIS AND CRASHWORTHINESS OF AN ORIGAMI-INSPIRED STRUCTURE

Origami, the art of paper folding, is often associated with Japanese culture. Implementing- ing origami into products that make lives easier and that achieve desirable attributes is the main aim of the origami-adapted design process. A thin-walled tube such as a trapezoid origami crash box is one such energy absorption device derived from origami. The surface of this tube is pre-folded to develop an origami pattern that is delicately designed which gives rise to an interesting- ing structure on the surface of a square tube. Geometric, compliance, and comparative analysis are made and the two extreme designs, Trapezoidal and Diamond origami crash boxes are compared for their energy absorption capability.

Heterogeneous origami-architected materials with variable stiffness

Origami, the ancient art of paper folding, has shown its potential as a versatile platform to design various reconfigurable structures. The designs of most origami-inspired architected materials rely on a periodic arrangement of identical unit cells repeated throughout the whole system. It is challenging to alter the arrangement once the design is fixed, which may limit the reconfigurable nature of origami-based structures. Inspired by phase transformations in natural materials, here we study origami tessellations that can transform between homogeneous configurations and highly heterogeneous configurations composed of different phases of origami unit cells. We find that extremely localized and reprogrammable heterogeneity can be achieved in our origami tessellation, which enables the control of mechanical stiffness and in-situ tunable locking behavior. To analyze this high reconfigurability and variable stiffness systematically, we employ Shannon information entropy. Our design and analysis strategy can pave the way for designing new types of transformable mechanical devices.

Experimental and Numerical Investigation on Radial Stiffness of Origami-inspired Tubular Structures

Origami structures, which were inspired by traditional paper folding arts, have been applied for engineering problems for the last two decades. Origami-based thin-wall tubes have been extensively investigated under axial loadings. However, less has been done with radial stiffness as one of the critical mechanical properties of a tubular structure working under lateral loadings. In this study, the radial stiffness of novel thin-wall tubular structures based on origami patterns have been studied with compression tests and finite element analysis (FEA) simulations. The results show that the radial stiffness of an origami-inspired tube can achieve about 27.1 times that of a circular tube with the same circumcircle diameter (100 mm), height (60 mm), and wall-thickness (2 mm). Yoshimura, Kresling, and modified Yoshimura patterns are selected as the basic frames, upon which the influences of different design parameters are tested and discussed. Given that the weight can vary due to different designs, the stiffness-to-weight ratio is also calculated. The origami-inspired tubular structures with superior stiffness performances are obtained and can be extended to crashworthy structures, functional structures, and stiffness enhancement with low structural weight.

On the existence of four or more curved foldings with common creases and crease patterns

Consider an oriented curve $$\Gamma $$ Γ in a domain D in the plane $${\varvec{R}}^2$$ R 2 . Thinking of D as a piece of paper, one can make a curved folding in the Euclidean space $${\varvec{R}}^3$$ R 3 . This can be expressed as the image of an “origami map” $$\Phi :D\rightarrow {\varvec{R}}^3$$ Φ : D → R 3 such that $$\Gamma $$ Γ is the singular set of $$\Phi $$ Φ , the word “origami” coming from the Japanese term for paper folding. We call the singular set image $$C:=\Phi (\Gamma )$$ C : = Φ ( Γ ) the crease of $$\Phi $$ Φ and the singular set $$\Gamma $$ Γ the crease pattern of $$\Phi $$ Φ . We are interested in the number of origami maps whose creases and crease patterns are C and $$\Gamma $$ Γ , respectively. Two such possibilities have been known. In the authors’ previous work, two other new possibilities and an explicit example with four such non-congruent distinct curved foldings were established. In this paper, we determine the possible values for the number N of congruence classes of curved foldings with the same crease and crease pattern. As a consequence, if C is a non-closed simple arc, then $$N=4$$ N = 4 if and only if both $$\Gamma $$ Γ and C do not admit any symmetries. On the other hand, when C is a closed curve, there are infinitely many distinct possibilities for curved foldings with the same crease and crease pattern, in general.

Spatial Strategies Used by Students With Visual Impairments to Solve Questions of Spatial Visualization

Introduction: This study examines the spatial abilities of middle school students with visual impairments (i.e., blindness and low vision) in the context of spatial visualization. The study also aims to examine the strategies used by such students in solving questions requiring spatial ability. Methods: Participants comprised eight students with visual impairments attending the 8th grade of a school in Ankara, Turkey, which teaches students with visual impairments. The data collection tool is composed of eight questions under the guidance of the definition for spatial visualization. Question types belonging to the spatial visualization subcomponent were organized in four topics: 2D rotation, 3D rotation, paper folding, and cube folding. Results: It was observed that students with visual impairments used mental rotation and key feature strategies for 2D rotation questions. They used the key feature strategy for 3D rotation questions and the mental manipulation strategy for cube folding and paper folding questions. Discussion: In this study, it was identified that strategies used by students with visual impairments show similarities with spatial strategies defined in the literature as used by students without visual impairments. Of all the other types of questions, the most successful question of students with visual impairments is the paper folding question. Implications for practitioners: The results of this article can help teachers become aware of the kind of difficulties that students with visual impairments encounter when they try to solve questions that require spatial ability.

Effect of Paper Folding (Origami) Instruction in Teaching Geometry

Considering the poor performance in mathematics of the Philippines in international examinations like PISA and TIMSS, this paper investigated the effect of paper folding (origami) instruction in teaching geometry. The participants were eighty-six (86) Grade 8 learners which randomly assigned to two groups – the control group and experimental group. This study used the quasi-experimental pre-test/post-test design. The experimental group was exposed to paper folding instruction and the control group learned through non-paper folding instruction. Results revealed the both groups achieved better performance through paper folding and non-paper folding instruction. However, the experimental group recorded higher mathematics performance compared to the control group. Thus, paper folding instruction promoted more effective learning in geometry. The information and insights from this study may be helpful to enhance the learners’ performance in geometry, the teacher’s strategies in teaching mathematics and to future researchers who would like to undertake similar studies.

Eksplorasi material daur ulang kantong plastik dengan teknik origami

Shopping plastic bag is a thermoplastic type LDPE and HDPE, that can be heated with hotpress. Through this recycling process come new material that can used for product material. The recycle plastic material has a lot of potential to be used as a product application. market research From founded many brands that try to recycle plastic still using another new material to give support to the plastic recycle material. Origami is a paper folding art that is commonly known by everyone. The study tried to apply the origami technique on recycled plastic bag material that has been heated with hotpress machine. With origami technique 90% the product can be made with this material entirely without the help of sewing and other materials. This is seen as an opportunity for the market that still use many new materials to support this material. The folding gives construction to the one sheet material and give new function to the recycle plastic material. The research uses experimental method. Series of paper origami patterns are applied on the recycle material, till founded several folding that can be apply on the recycle plastic sheet material. The research result is a variety of functional products made with origami techniques that have been egistered design industry copy wright.