Concept and design of a metastructure-based multi-stable surface

Zhang, Yong; Tichem, Marcel; Keulen, Fred van

doi:10.1016/j.eml.2021.101553

Cited by 12 publications

(3 citation statements)

References 37 publications

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“…To address this limitation and meet the demand for single-input actuation, an element is introduced, consisting of an elastic layer bonded to the plate with a bistable perforated joint [81] [Figure 2D]. The element can fold upon release after stretching due to the eccentric recovery force from the elastic membrane [82] . By combining bistable elements with distinct transition forces, programmed strips are created, allowing for multistep transformations into 2D or 3D shapes.…”

Section: Elastic Instabilitymentioning

confidence: 99%

Morphing matter: from mechanical principles to robotic applications

Yang,

Zhou,

Zhao

et al. 2023

Soft Sci

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The adaptability of natural organisms in altering body shapes in response to the environment has inspired the development of artificial morphing matter. These materials encode the ability to transform their geometrical configurations in response to specific stimuli and have diverse applications in soft robotics, wearable electronics, and biomedical devices. However, achieving the morphing of intricate three-dimensional shapes from a two-dimensional flat state is challenging, as it requires manipulations of surface curvature in a controlled manner. In this review, we first summarize the mechanical principles extensively explored for realizing morphing matter, both at the material and structural levels. We then highlight its applications in the soft robotics field. Moreover, we offer insights into the open challenges and opportunities that this rapidly growing field faces. This review aims to inspire researchers to uncover innovative working principles and create multifunctional morphing matter for various engineering fields.

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Section: Elastic Instabilitymentioning

confidence: 99%

Morphing matter: from mechanical principles to robotic applications

Yang,

Zhou,

Zhao

et al. 2023

Soft Sci

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“…Another example can be found in Ionic polymer-metal composite (IMPC) actuators that use positive and negative voltages to switch between two states and enable motion for untethered miniature robots [28]. Additionally, manual resets are commonly used in various contexts, such as in mechanical signal propagation within soft media [29] and multistable surfaces [6,30].…”

Section: Introductionmentioning

confidence: 99%

“…For a system with a single bistable unit, the requirement for two distinct digital inputs can be manageable. However, the implementation becomes more challenging in complex structures that utilize multistability to achieve multiple functionalities or properties [5,30,31]. These systems, leveraging numerous stable states, require sophisticated actuation [32] or control schemes [26] for state transitions.…”

Section: Introductionmentioning

confidence: 99%

A Single-Input State-Switching Building Block Harnessing Internal Instabilities

ten Wolde,

Farhadi

2023

Preprint

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Exploiting Geometric Frustration in Coupled von Mises Trusses to Program Multifunctional Mechanical Metamaterials

Liétard,

Therriault,

Melancon

2024

Adv Eng Mater

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Multistable mechanical metamaterials are an emerging class of materials whose intricate internal structure can be engineered to program mechanical properties and promote reversible transitions between multiple stable states of energy. In this work, the design of a mechanical metamaterial based on an assembly of bistable von Mises trusses is presented. It is shown that coupling two von Mises trusses induces geometric frustration, which leads to an asymmetry between the stable states. Then the von Mises trusses are combined to build a unit cell that can change effective stiffness in compression when switching states. Based on a semi‐analytical model, the stiffness variation is characterized as a function of the geometric parameters and three possible scenarios are highlighted: 1) increased, 2) decreased, or 3) constant stiffness between the stable states. To validate the concept, the multistable metamaterials out of polylactic acid and thermoplastic polyurethane via fused filament fabrication are fabricated, and their mechanical response is evaluated by measuring experimentally the effective stiffness in both stable states under compression. This unit cell also features modularity, enabling reversible assembly and post‐fabrication tunability. Finally, a range of applications are explored, including sandwich panels capable of changing their compressive and bending stiffness as well as their surface morphology.

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Concept and design of a metastructure-based multi-stable surface

Cited by 12 publications

References 37 publications

Morphing matter: from mechanical principles to robotic applications

Morphing matter: from mechanical principles to robotic applications

A Single-Input State-Switching Building Block Harnessing Internal Instabilities

Exploiting Geometric Frustration in Coupled von Mises Trusses to Program Multifunctional Mechanical Metamaterials

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