A novel layered topology of auxetic materials based on the tetrachiral honeycomb microstructure

Auricchio, Ferdinando; Bacigalupo, Andrea; Gambarotta, Luigi; Lepidi, Marco; Morganti, Simone; Vadalá, Francesca

doi:10.1016/j.matdes.2019.107883

Cited by 47 publications

(14 citation statements)

References 62 publications

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“…The external and internal apexes of a double-V structure were introduced with a curvature to form the new structure. The results showed promising NPRs and moduli that lied closely with those of double-V structures for different directions of applied compressive loads A layered topological framework integrated using tetrachiral honeycomb microstructures shows an exceptional coupling between the normal and angular strains, as described in preliminary laboratory studies [146]. An extension of this finding to bi-tetrachiral materials exhibited strong auxeticity with NPRs of approximately -0.7.…”

Section: Common Auxetic Structures and Their Prominent Characteristicssupporting

confidence: 56%

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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Section: Common Auxetic Structures and Their Prominent Characteristicssupporting

confidence: 56%

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

2021

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“…Studying this distinct deformation mode will allow us to develop more novel material with unique properties. [ 81 ]…”

Section: Smart Materials For 4d Printingmentioning

confidence: 99%

Additive manufacturing of smart polymeric composites: Literature review and future perspectives

2022

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The latest developments in smart systems for improved human lives with advanced biomedical devices have evolved out of multi‐disciplinary scientific studies, including medicine, biology, material sciences, design, manufacturing, artificial intelligence, microelectronics, and so forth. The growth of such intelligent systems is primarily possible with innovative materials, which demonstrate the response to various external stimuli like temperature, heat, moisture, light, electromagnetic field, and chemical alteration. Such materials have been recently fabricated using different additive manufacturing techniques to devise personalized unique, complex, and novel structures that can adjust to external conditions over time and are specifically attributed to 4D printing. Novel materials that can further improve such systems continued to be explored and employed. This review paper investigates the additive manufacturing of functional polymer nanocomposites, which offer compliant structures with flexible manufacturing processes with high strength, low cost, and long‐term stability. This study aims to deliver a comprehensive and deep understanding of the latest developments in materials, design, manufacturing, fundamental mechanisms involved, and future possibilities in this area of research.

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“…Auricchio et al [50] focused on the idea of layered support materials based on the existing tetrachiral honeycomb structure. Solid state finite element analysis (FEA) of both models was performed to predict their deformation behaviour and to confirm experimental measurements of tetrachiral displacement under uniaxial tensile loads.…”

Section: Supporting Simulation and Topology Optimization Resourcesmentioning

confidence: 99%

Auxetic Metamaterials for Biomedical Devices: Current Situation, Main Challenges, and Research Trends

et al. 2022

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Auxetic metamaterials are characterized by a negative Poisson ratio (NPR) and display an unexpected property of lateral expansion when stretched and densification when compressed. Auxetic properties can be achieved by designing special microstructures, hence their classification as metamaterials, and can be manufactured with varied raw materials and methods. Since work in this field began, auxetics have been considered for different biomedical applications, as some biological tissues have auxetic-like behaviour due to their lightweight structure and morphing properties, which makes auxetics ideal for interacting with the human body. This research study is developed with the aim of presenting an updated overview of auxetic metamaterials for biomedical devices. It stands out for providing a comprehensive view of medical applications for auxetics, including a focus on prosthetics, orthotics, ergonomic appliances, performance enhancement devices, in vitro medical devices for interacting with cells, and advanced medicinal clinical products, especially tissue engineering scaffolds with living cells. Innovative design and simulation approaches for the engineering of auxetic-based products are covered, and the relevant manufacturing technologies for prototyping and producing auxetics are analysed, taking into consideration those capable of processing biomaterials and enabling multi-scale and multi-material auxetics. An engineering design rational for auxetics-based medical devices is presented with integrative purposes. Finally, key research, development and expected technological breakthroughs are discussed.

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A novel layered topology of auxetic materials based on the tetrachiral honeycomb microstructure

Cited by 47 publications

References 62 publications

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

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

Additive manufacturing of smart polymeric composites: Literature review and future perspectives

Auxetic Metamaterials for Biomedical Devices: Current Situation, Main Challenges, and Research Trends

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