Shape memory response and hierarchical motion capabilities of 4D printed auxetic structures

Pandini, Stefano; Inverardi, Nicoletta; Scalet, Giulia; Battini, Davide; Bignotti, Fabio; Marconi, Stefania; Auricchio, Ferdinando

doi:10.1016/j.mechrescom.2019.103463

Cited by 39 publications

(30 citation statements)

References 14 publications

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“…Compared with 3D re‐entrant auxetic metamaterials with single material, dual‐material auxetic metamaterials have stable NPR at large strain . Based on the similar principle of curing photosensitive resin, SLA technique has been also adopted to fabricate chiral and re‐entrant AMMs . The FDM technique has been successfully applied to the fabrication of chiral AMMs with a reprogrammable shape, using thermoplastic materials like polylactic acid (PLA) as printing materials.…”

Section: Manufacturing Methods and Materialsmentioning

confidence: 99%

“…[126] Based on the similar principle of curing photosensitive resin, SLA technique has been also adopted to fabricate chiral and re-entrant AMMs. [45,60,[129][130][131] The FDM technique has been successfully applied to the fabrication of chiral AMMs with a reprogrammable shape, [127] using thermoplastic materials like polylactic acid (PLA) as printing materials. Compared with other thermoplastic materials, nylon has a high mechanical strength and good toughness.…”

Section: Additive Manufacturingmentioning

confidence: 99%

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Progress in Auxetic Mechanical Metamaterials: Structures, Characteristics, Manufacturing Methods, and Applications

et al. 2020

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Auxetic mechanical metamaterials (AMMs), as an exciting paradigm of metamaterials, have attracted increasing attention due to their interesting mechanical properties (e.g. negative Poisson's ratio), as well as the emergence of advanced manufacturing technology (e.g. 3D printing). Although various reviews on AMMs, their structures, properties, and applications, have existed, it still lacks a comprehensive review in terms of manufacturing methods. Herein, the latest progress in AMMs is extensively reviewed, including AMMs' structures, characteristics, manufacturing methods, and applications. In addition, the current challenges and future works of AMMs are concluded and discussed. This Review aims to serve as a collection of knowledge that supplies more comprehensive understanding and inspiration to support further developments of AMMs from the perspective of design and manufacturing.

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Section: Manufacturing Methods and Materialsmentioning

confidence: 99%

Section: Additive Manufacturingmentioning

confidence: 99%

Progress in Auxetic Mechanical Metamaterials: Structures, Characteristics, Manufacturing Methods, and Applications

et al. 2020

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“…In addition, 4D printing has been another pivotal AM technique that facilitates the production of active structures whose responses are triggered by external stimuli. This AM technique has proved to be a boon in the manufacturing of shape memory polymer (SMP) based auxetic structure [61]. Studies on the mechanical behavior of such materials showed an appreciable NPR of -0.18 with good retention of the initial shape in the absence of the actuating force.…”

Section: Development Of Additive Manufacturing For Auxetic Structuresmentioning

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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“…[20][21][22][23] Lightweight sandwich panels are widely used in aerospace, automotive, marine, and construction industries owing to their high ratio of flexural stiffness to weight, high energy absorption capability, and superb thermal insulation. 24,25 In a close cell structure, the sandwich panel includes two layers at the top and bottom of the panel with a cellular core in between. In fact, this lightweight adheres to the solid external sheets to make sandwich panels that have buckling resistance and a high bending stiffness 26 as well as energy absorption capability and utmost shear strength.…”

Section: Introductionmentioning

confidence: 99%

“…Lightweight sandwich panels are widely used in aerospace, automotive, marine, and construction industries owing to their high ratio of flexural stiffness to weight, high energy absorption capability, and superb thermal insulation 24,25 . In a close cell structure, the sandwich panel includes two layers at the top and bottom of the panel with a cellular core in between.…”

Section: Introductionmentioning

confidence: 99%

Investigation on shape recovery of 3D printed honeycomb sandwich structure

Mehrpouya

Gisario

Azizi

et al. 2020

Polymers for Advanced Techs

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Lightweight sandwich panels have been used in various industry sectors due to their unique properties as well as a high ratio of stiffness-to-weight and energy absorption. Three-dimensional (3D) printing process provides a unique opportunity to fabricate highly complex shapes of sandwich panels and also the application of smart materials, such as shape memory polymers, can create unique functionality for the 3D printed sandwich structure so that they can change their shape in response to external stimuli and give a new dimension to the printing process called four-dimensional (4D) printing. Polylactic acid is a biodegradable and compostable polymer with a good shape memory effect that can be printed easily with an inexpensive fused deposition modeling. This study investigated the effect of printing and activation parameters on the functionality, in particular shape recovery, of the deformed sandwich structure with honeycomb out-of-plane tailored core. The input parameters were the activation temperature, the nozzle temperature, and the printing velocity. The results showed that the optimum recovery ratio can be achieved using a higher activations and nozzle temperatures and lower printing speed.

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Shape memory response and hierarchical motion capabilities of 4D printed auxetic structures

Cited by 39 publications

References 14 publications

Progress in Auxetic Mechanical Metamaterials: Structures, Characteristics, Manufacturing Methods, and Applications

Progress in Auxetic Mechanical Metamaterials: Structures, Characteristics, Manufacturing Methods, and Applications

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

Investigation on shape recovery of 3D printed honeycomb sandwich structure

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