Folding at the Microscale: Enabling Multifunctional 3D Origami‐Architected Metamaterials

Lin, Zhaowen; Novelino, Larissa S.; Wei, Heming; Alderete, Nicolas A.; Paulino, Gláucio H.; Espinosa, Horacio D.; Krishnaswamy, Sridhar

doi:10.1002/smll.202002229

Cited by 44 publications

(33 citation statements)

References 32 publications

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“…Some auxetic systems are also characterised by a negative value of the coefficient of thermal expansion, implying that they shrink when subjected to an increase in temperature [33][34][35]. Additionally, it has been shown that it is also possible to achieve a smooth transition through a wide range of negative and positive Poisson's ratios by using an origami cell that morphs continuously between a Miura mode and an eggbox mode [36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Hierarchical auxetic and isotropic porous medium with extremely negative Poisson’s ratio

Morvaridi

Carta

Bosia

et al. 2021

Extreme Mechanics Letters

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We propose a novel two-dimensional hierarchical auxetic structure, consisting of a porous medium in which a homogeneous matrix includes a rank-two set of cuts characterised by different scales. The six-fold symmetry of the perforations makes the medium isotropic in the plane. Remarkably, the mesoscale interaction between the first-and second-level cuts enables the attainment of a very small value of the Poisson's ratio, close to the minimum reachable limit of -1. The effective properties of the hierarchical auxetic structure are determined numerically, considering both a unit cell with periodic boundary conditions and a finite structure containing a large number of repeating cells. Further, results of the numerical study are validated experimentally on a polymeric specimen with appropriately arranged rank-two cuts, tested under uniaxial tension. We envisage that the proposed hierarchical design can be useful in numerous engineering applications exploiting an extreme auxetic effect.

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Section: Introductionmentioning

confidence: 99%

Hierarchical auxetic and isotropic porous medium with extremely negative Poisson’s ratio

Morvaridi

Carta

Bosia

et al. 2021

Extreme Mechanics Letters

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“…Last, we demonstrate the drug storage and release capabilities of the crawler by using the inherent internal cavity of the Kresling unit. To expand the work, advanced fabrication methods, such as small-scale three-dimensional printing ( 49 ), stress-controlled folding ( 50 ), and mechanically guided assembly ( 51 ), can further downsize the origami crawler, bringing forth potential applications in more narrow and confined environments. Highly autonomous biomedical robots based on the presented design are promising for future disease diagnoses and treatment by integrating the functionalities of sensing, vision, computing, and drug storage into the Kresling origami internal cavity.…”

Section: Discussionmentioning

confidence: 99%

Soft robotic origami crawler

et al. 2022

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Biomimetic soft robotic crawlers have attracted extensive attention in various engineering fields, owing to their adaptivity to different terrains. Earthworm-like crawlers realize locomotion through in-plane contraction, while inchworm-like crawlers exhibit out-of-plane bending-based motions. Although in-plane contraction crawlers demonstrate effective motion in confined spaces, miniaturization is challenging because of limited actuation methods and complex structures. Here, we report a magnetically actuated small-scale origami crawler with in-plane contraction. The contraction mechanism is achieved through a four-unit Kresling origami assembly consisting of two Kresling dipoles with two-level symmetry. Magnetic actuation is used to provide appropriate torque distribution, enabling a small-scale and untethered robot with both crawling and steering capabilities. The crawler can overcome large resistances from severely confined spaces by its anisotropic and magnetically tunable structural stiffness. The multifunctionality of the crawler is explored by using the internal cavity of the crawler for drug storage and release. The magnetic origami crawler can potentially serve as a minimally invasive device for biomedical applications.

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“…The method is seen to produce freely movable microstructures made of mechanical metamaterials and exhibited NPRs of as low as -0.44 [140]. Three-dimensional origami structures with appreciable foldability were fabricated using DLW [141]. The easier foldability is attributed to the reduced bending stiffness at the micro-and nano-dimensions.…”

Section: Dlwmentioning

confidence: 99%

On the application of additive manufacturing methods for auxetic structures: a review

2021

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Auxetic structures are a special class of structural components that exhibit a negative Poisson's ratio (NPR) because of their constituent materials, internal microstructure, or structural geometry. To realize such structures, specialized manufacturing processes are required to achieve a dimensional accuracy, reduction of material wastage, and a quicker fabrication. Hence, additive manufacturing (AM) techniques play a pivotal role in this context. AM is a layer-wise manufacturing process and builds the structure as per the designed geometry with appreciable precision and accuracy. Hence, it is extremely beneficial to fabricate auxetic structures using AM, which is otherwise a tedious and expensive task. In this study, a detailed discussion of the various AM techniques used in the fabrication of auxetic structures is presented. The advancements and advantages put forward by the AM domain have offered a plethora of opportunities for the fabrication and development of unconventional structures. Therefore, the authors have attempted to provide a meaningful encapsulation and a detailed discussion of the most recent of such advancements pertaining to auxetic structures. The article opens with a brief history of the growth of auxetic materials and later auxetic structures. Subsequently, discussions centering on the different AM techniques employed for the realization of auxetic structures are conducted. The basic principle, advantages, and disadvantages of these processes are discussed to provide an in-depth understanding of the current level of research. Furthermore, the performance of some of the prominent auxetic structures realized through these methods is discussed to compare their benefits and shortcomings. In addition, the influences of geometric and process parameters on such structures are evaluated through a comprehensive review to assess their feasibility for the latermentioned applications. Finally, valuable insights into the applications, limitations, and prospects of AM for auxetic structures are provided to enable the readers to gauge the vitality of such manufacturing as a production method.

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Folding at the Microscale: Enabling Multifunctional 3D Origami‐Architected Metamaterials

Cited by 44 publications

References 32 publications

Hierarchical auxetic and isotropic porous medium with extremely negative Poisson’s ratio

Hierarchical auxetic and isotropic porous medium with extremely negative Poisson’s ratio

Soft robotic origami crawler

On the application of additive manufacturing methods for auxetic structures: a review

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