The behaviour of curved-crease foldcores under low-velocity impact loads

Gattas, Joseph M.; Zhang, You

doi:10.1016/j.ijsolstr.2014.10.019

Cited by 105 publications

(41 citation statements)

References 17 publications

(26 reference statements)

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“…Since the thickness of folded sheets are small compared to the overall size of origami material, facets are typically meshed by different types of shell elements in the finite element method . Modeling the creases on the other hand is not a trivial task because the material stiffness and strength along the crease can be lower than the facets due to fabrication.…”

Section: Analytical Tools For Origami Mechanicsmentioning

confidence: 99%

“…However, under blast impact (aka a nonuniform external pressure field), both face skin stretching and origami facet buckling play important roles . Curved creases and the Kirigami cutting (Figure c) were explored to obtain superior impact absorption than Miura‐ori and its derivatives, and their geometric designs can be tailored for performance optimization. It is found that the optimized origamis typically feature facets orientated near perpendicular to the face skins .…”

Section: Folding Induced Mechanical Propertiesmentioning

confidence: 99%

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Architected Origami Materials: How Folding Creates Sophisticated Mechanical Properties

et al. 2018

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devices, [26,27] to small-scale nano- [28][29][30] and DNA origamis. [31] A common theme in these studies is to exploit the sophisticated shape transformations from folding. For example, an origami robot is typically fabricated in a 2D flat configuration and then folded into the prescribed 3D shape to perform its tasks. The origamis have been treated essentially as linkage mechanisms in which rigid facets rotate around hingelike creases (aka "rigid-folding origami"). Elastic deformation of the constituent sheet materials or the dynamics of folding are often neglected. Such a limitation in scope indeed resonates the origin of this field, that is, folding was initially considered as a topic in geometry and kinematics.However, the increasingly diverse applications of origami require us to understand the force-deformation relationship and other mechanical properties of folded structures. Over the last decade, studies in this field started to expand beyond design and kinematics and into the domain of mechanics and dynamics. Catalyzed by this development, a family of architected origami materials quickly emerged (Figure 1). These materials are essentially assemblies of origami sheets or modules with carefully designed crease patterns. The kinematics of folding still plays an important role in creating certain properties of these origami materials. For example, rigid folding of the classical Miura-ori sheet induces an in-plane deformation pattern with auxetic properties (aka negative Poisson's ratios). [32,33] However, elastic energy in the deformed facets and creases, combined with their intricate spatial distributions, impart the origami materials with a rich list of desirable and even unorthodox properties that were never examined in origami before. For example, the Ron-Resch fold creates a unique tri-fold structure where pairs of triangular facets are oriented vertically to the overall origami sheet and pressed against each other. Such an arrangement can effectively resist buckling and create very high compressive load bearing capacity. [34] Other achieved properties include shape-reconfiguration, tunable nonlinear stiffness and dynamic characteristics, multistability, and impact absorption.Since the architected origami materials obtain their unique properties from the 3D geometries of the constituent sheets or modules, they can be considered a subset of architected cellular solids or mechanical metamaterials. [35][36][37][38][39] However, the origami materials have many unique characteristics. The rich geometries of origami offer us great freedom to tailor targeted Origami, the ancient Japanese art of paper folding, is not only an inspiring technique to create sophisticated shapes, but also a surprisingly powerful method to induce nonlinear mechanical properties. Over the last decade, advances in crease design, mechanics modeling, and scalable fabrication have fostered the rapid emergence of architected origami materials. These materials typically consist of folded origami sheets or modules with intricate 3D geomet...

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Section: Analytical Tools For Origami Mechanicsmentioning

confidence: 99%

Section: Folding Induced Mechanical Propertiesmentioning

confidence: 99%

Architected Origami Materials: How Folding Creates Sophisticated Mechanical Properties

et al. 2018

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“…The weight‐to‐compressive‐strength ratio of a foldcore is typically lower than that of a honeycomb . However, foldcores made of carbon‐fiber‐reinforced composites (CFRCs) show compressive strength similar to a Nomex honeycomb and are lighter.…”

Section: Corrugated Coresmentioning

confidence: 99%

Sandwich Structures with Prismatic and Foam Cores: A Review

Xiong

Mousanezhad³

et al. 2018

Adv Eng Mater

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This article provides a comprehensive review of recent research efforts on the development and characterization of sandwich structures with corrugated, honeycomb, and foam cores. The topics discussed in this review article include aspects of core-face bonding and reinforcement, enhancement of core mechanical properties and panel performance (including the role of structural hierarchy), and multifunctional advantages offered by different core constructions. In addition, the review discusses potential applications, including in morphing wing design, impact resistance, and ultralightweight applications. Future research directions are discussed.

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“…For example, they can be used as deployable stents in biomedicine [14], as inflatable structural booms for space structures [15,16], or as actuators and bellows [4,17,18]. Origami tubes have a self-constraining geometry that makes them suitable for energy absorption devices [19][20][21][22]. Stacking and coupling of origami tubes into more complex geometries can lead to stiffening of the system and enhanced mechanical characteristics [11,13,23,24].…”

Section: Introductionmentioning

confidence: 99%

Origami tubes with reconfigurable polygonal cross-sections

2016

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Thin sheets can be assembled into origami tubes to create a variety of deployable, reconfigurable and mechanistically unique three-dimensional structures. We introduce and explore origami tubes with polygonal, translational symmetric cross-sections that can reconfigure into numerous geometries. The tubular structures satisfy the mathematical definitions for flat and rigid foldability, meaning that they can fully unfold from a flattened state with deformations occurring only at the fold lines. The tubes do not need to be straight and can be constructed to follow a nonlinear curved line when deployed. The cross-section and kinematics of the tubular structures can be reprogrammed by changing the direction of folding at some folds. We discuss the variety of tubular structures that can be conceived and we show limitations that govern the geometric design. We quantify the global stiffness of the origami tubes through eigenvalue and structural analyses and highlight the mechanical characteristics of these systems. The two-scale nature of this work indicates that, from a local viewpoint, the crosssections of the polygonal tubes are reconfigurable while, from a global viewpoint, deployable tubes of desired shapes are achieved. This class of tubes has potential applications ranging from pipes and microrobotics to deployable architecture in buildings.

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The behaviour of curved-crease foldcores under low-velocity impact loads

Cited by 105 publications

References 17 publications

Architected Origami Materials: How Folding Creates Sophisticated Mechanical Properties

Architected Origami Materials: How Folding Creates Sophisticated Mechanical Properties

Sandwich Structures with Prismatic and Foam Cores: A Review

Origami tubes with reconfigurable polygonal cross-sections

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