Multistable Shape‐Reconfigurable Architected Materials

Haghpanah, Babak; Salari-Sharif, Ladan; Pourrajab, Peyman; Hopkins, Jonathan B.; Valdevit, Lorenzo

doi:10.1002/adma.201601650

Cited by 333 publications

(202 citation statements)

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“…As bistable elastic beams can lock in most of the energy provided to the system during loading, they have been recently used to create fully elastic and reusable energy-trapping architected materials. [23][24][25] Moreover, the ability of bistable beams to release stored elastic energy has been exploited to overcome both dissipative and dispersive effects to allow the propagation of mechanical signals with a large amplitude in soft systems made of dissipative materials. 26 Exploiting instability in solids and structures has offered new opportunities for the design of architected materials with enhanced functionalities.…”

Section: B Nonlinear Architected Materialsmentioning

confidence: 99%

Introduction

et al. 2018

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Section: B Nonlinear Architected Materialsmentioning

confidence: 99%

Introduction

et al. 2018

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“…Whereas all these efforts demonstrate that elastic instability locally distributed in a monolithic material can bring about negative Poissons ratio, all of them return to their original shape once the elastic strain is removed. Multistable materials, on the other hand, can assume besides their initial position, additional configurations of equilibrium [7,8,25,26], but seldom do they exhibit auxeticity. So far in the literature, only few works combine auxeticity and multistability in monolithic materials [27,29], with examples created mainly from origami patterns [19,28].…”

Section: Introductionmentioning

confidence: 99%

Durable bistable auxetics made of rigid solids

et al. 2017

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Bistable Auxetic Metamaterials (BAMs) are a class of monolithic perforated periodic structures with negative Poissons ratio. Under tension, a BAM can expand and reach a second state of equilibrium through a globally large shape transformation that is ensured by the flexibility of its elastomeric base material. However, if made from a rigid polymer, or metal, BAM ceases to function due to the inevitable rupture of its ligaments. The goal of this work is to extend the unique functionality of the original kirigami architecture of BAM to a rigid solid base material. We use experiments and numerical simulations to assess performance, bistability and durability of rigid BAMs at 10,000 cycles. Geometric maps are presented to elucidate the role of the main descriptors of BAM architecture. The proposed design enables the realization of BAM from a large palette of materials, including elastic-perfectly plastic materials and potentially brittle materials.

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“…[28] Examples of NS materials include polymethacrylimide (PMI) foams, [16] honeycombs and lattices, [29,AA1,AA2] and certain crystals (VO 2 , BaTiO 3 )…”

Section: General Rightsmentioning

confidence: 99%

“…[26,27] NS materials and structures, on the other hand, are thermodynamically unstable unless stabilised by an external constraint. [28] Examples of NS materials include polymethacrylimide (PMI) foams, [16] honeycombs and lattices, [29,AA1,AA2] and certain crystals (VO 2 , BaTiO 3 )…”

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confidence: 99%

“…[21] Periodic arrangements of sub-units leading to auxetic behaviour include truss, [16,22] corner-sharing polygon, [23,24] and hybrid truss-polygon [25] frameworks, and particle assemblies. [26,27] NS materials and structures, on the other hand, are thermodynamically unstable unless stabilised by an external constraint.[28] Examples of NS materials include polymethacrylimide (PMI) foams, [16] honeycombs and lattices, [29,AA1,AA2] and certain crystals (VO 2 , BaTiO 3 )undergoing constrained phase transformation. [30,31] The NS effect can also be displayed by constrained buckled tube [32] , buckled beam [33] or multiple magnet [34] systems.…”

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Double‐Negative Mechanical Metamaterials Displaying Simultaneous Negative Stiffness and Negative Poisson's Ratio Properties

Hewage¹,

Alderson²,

Alderson³

et al. 2016

Advanced Materials

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms Intuitively, materials become both shorter and wider when compressed along their length.Here we show how a composite material or structure can display a simultaneous reversal in the direction of deformation for both the axial and transverse dimensions, corresponding to negative values of effective stiffness and effective Poisson's ratio, respectively. A negative Poisson's ratio [1] (NPR or auxetic [2] ) host assembly stabilising (otherwise unstable) embedded negative stiffness [3] [4,5] Metamaterials include negative refractive index [6] and negative effective mass density [7] materials finding use in, for example, electromagnetic and acoustic cloaking/lensing applications, respectively. Examples of mechanical metamaterials are negative compressibility transition, [4] NPR [1] and NS [3] materials.Auxetic materials and structures exist, and are stable in the unconstrained state, at the nanoscale (e.g. crystalline forms of silica, [8] zeolites [9] and cellulose [10] ), microscale (microporous polymers [11] and microfabricated truss-like structures [12] ) and macroscale (composite laminates, [13] foams, [14,15] honeycombs [16] and patterned elastomeric spherical shells [17] ). Enhanced shear modulus, [18] energy absorption [19] and indentation resistance [20] are some of the benefits known for auxetic materials and structures. [21] Periodic arrangements of sub-units leading to auxetic behaviour include truss, [16,22] corner-sharing polygon, [23,24] and hybrid truss-polygon [25] frameworks, and particle assemblies. [26,27] NS materials and structures, on the other hand, are thermodynamically unstable unless stabilised by an external constraint.[28] Examples of NS materials include polymethacrylimide (PMI) foams, [16] honeycombs and lattices, [29,AA1,AA2] and certain crystals (VO 2 , BaTiO 3 )undergoing constrained phase transformation. [30,31] The NS effect can also be displayed by constrained buckled tube [32] , buckled beam [33] or multiple magnet [34] systems. Whereas our system is demonstrated to display NS under quasi-static loading, it should be pointed out that a number of these previous studies [3,[30][31][32] measured the dynamic modulus. Dynamic loading of NS materials can give rise to beneficial temporary effects demonstrated, for example, in 3 3 composite systems containing NS inclusions or elements which display extreme stiffness [30] and vibration damping [3,32] responses.Our 'double-negative' mechanical metamaterial displaying simultaneous negative Poisson's ratio and negative stiffness properties comprises an auxetic host framework constraining embedded NS elements. The framework consists of a regular array of interlocked rigid hexagonal sub-units with 3 male and 3 female keys per sub-unit, arranged in an alternating fashion around the six sides of the hexagon [27] (Figure 1...

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Multistable Shape‐Reconfigurable Architected Materials

Cited by 333 publications

References 30 publications

Introduction

Introduction

Durable bistable auxetics made of rigid solids

Double‐Negative Mechanical Metamaterials Displaying Simultaneous Negative Stiffness and Negative Poisson's Ratio Properties

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