Bioinspired kirigami metasurfaces as assistive shoe grips

Babaee, Sahab; Pajovic, Simo; Rafsanjani, Ahmad; Shi, Yichao; Bertoldi, Katia; Traverso, Giovanni

doi:10.1038/s41551-020-0564-3

Cited by 78 publications

(60 citation statements)

References 48 publications

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“…It is found that the perforated structure exhibits obvious auxetic effect because all the lines move outward, which means that when the structure is stretched longitudinally, the lateral expansion occurs. With the displacement solutions, the Poisson's ratio of the simulated model can be calculated by substituting Equation (6) into Equation (5). In addition, the mesh convergence analysis is performed in Figure 10 because the FEM is mesh-dependent method.…”

Section: Validation Of the Simulated Modelmentioning

confidence: 99%

“…The auxetic metamaterials with negative Poisson's ratio pioneered by Lakes [1] have exhibited distinctive physical characteristics such as low density, light mass, high energy absorption, abnormal deformation, and excellent impact resistance, [2,3] so they can be used in the fields of medicine, sport, aerospace, and transportation. [4][5][6] Currently, the designed auxetic structures can be roughly classified into three categories: the beam-dominated structures, including reentrant structures, star-shaped structures, and chiral structures; [7][8][9] the perforated structures with orthogonally aligned holes; [10][11][12][13] and the kirigami structures consisting of rotating rigid units connected through joints. [14,15] It has been demonstrated that the perforated structures are relatively easy to be produced and also can lead to stable auxetic deformation than the beam-dominated auxetic structures and the kirigami structures.…”

Section: Introductionmentioning

confidence: 99%

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Novel Planar Auxetic Metamaterial Perforated with Orthogonally Aligned Oval‐Shaped Holes and Machine Learning Solutions

2021

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Auxetic metamaterials with negative Poisson's ratio have attracted much attention due to their counterintuitive deformation behavior over the conventional engineering materials. However, it is difficult to describe the complex correlation between microstructure parameters and auxeticity by analytical or empirical solutions in the form of math expressions. Herein, the machine learning (ML) model with artificial neural network (ANN) is developed to analyze a novel planar auxetic metamaterial designed by introducing orthogonally aligned oval‐shaped perforations in solid base material, and its feasibility is demonstrated through the experimental and finite element method (FEM) solutions. It is found that the proposed structure involving less design parameters exhibits the best performance at the aspects of auxetic behavior and stress level than those with peanut‐shaped holes and elliptic holes. Moreover, the results of parameter analysis demonstrate that the present ML solution model can provide accurate predicting results rapidly for this problem, without the limitations of explicit solution expressions which are typically not available in practice. The ML model allows one to obtain the desired auxetic property by tailoring the geometric parameters effectively and accelerate auxetic metamaterial design.

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Section: Validation Of the Simulated Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Planar Auxetic Metamaterial Perforated with Orthogonally Aligned Oval‐Shaped Holes and Machine Learning Solutions

2021

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“…It can be found in the literature that thin-film devices are widely used in flexible electronics/optoelectronics, biomedical devices, energy storage, and conversion systems [ 32 , 33 ]. Through structural design, such as origami [ 34 ], kirigami [ 35 ], bending [ 36 ], and winding [ 37 ], a thin piezoelectric film can be transformed to various two-dimensional (2D) or three-dimensional (3D) structures [ 38 ], which can give the devices new features such as stretchability and also enable them to deliver an accurate output in the required application conditions.…”

Section: Introductionmentioning

confidence: 99%

Active-Sensing Epidermal Stretchable Bioelectronic Patch for Noninvasive, Conformal, and Wireless Tendon Monitoring

Shu

Chen

et al. 2021

Research

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Sensors capable of monitoring dynamic mechanics of tendons throughout a body in real time could bring systematic information about a human body’s physical condition, which is beneficial for avoiding muscle injury, checking hereditary muscle atrophy, and so on. However, the development of such sensors has been hindered by the requirement of superior portability, high resolution, and superb conformability. Here, we present a wearable and stretchable bioelectronic patch for detecting tendon activities. It is made up of a piezoelectric material, systematically optimized from architectures and mechanics, and exhibits a high resolution of 5.8×10−5 N with a linearity parameter of R2=0.999. Additionally, a tendon real-time monitoring and healthcare system is established by integrating the patch with a micro controller unit (MCU), which is able to process collected data and deliver feedback for exercise evaluation. Specifically, through the patch on the ankle, we measured the maximum force on the Achilles tendon during jumping which is about 16312 N, which is much higher than that during normal walking (3208 N) and running (5909 N). This work not only provides a strategy for facile monitoring of the variation of the tendon throughout the body but also throws light on the profound comprehension of human activities.

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“…In nature, abundant functionalities of living things have guided us to develop artificial systems that mimic similar capabilities to interact well with the environment. [1][2][3][4][5][6] Recently, bionics has been widely applied in the construction of various electronic devices such as sensors, [7,8] nanogenerators, [9,10] batteries, [11,12] importantly, this color-tunable device exhibited an excellent flexibility and robustness, and could be designed into any pattern for camouflage and communication. Figure 1a schematically illustrates the structure of our flexible color-tunable ACEL device.…”

Section: Introductionmentioning

confidence: 99%

“…In nature, abundant functionalities of living things have guided us to develop artificial systems that mimic similar capabilities to interact well with the environment. [ 1–6 ] Recently, bionics has been widely applied in the construction of various electronic devices such as sensors, [ 7,8 ] nanogenerators, [ 9,10 ] batteries, [ 11,12 ] and integrated systems. [ 13–16 ] As an indispensable component for electronic devices and a key window of information communication, the optoelectronic display is no exception.…”

Section: Introductionmentioning

confidence: 99%

Flexible Color‐Tunable Electroluminescent Devices by Designing Dielectric‐Distinguishing Double‐Stacked Emissive Layers

Zuo

Shi

Zhou

et al. 2020

Adv Funct Materials

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Intrinsically flexible alternating current electroluminescent devices have sparked widespread research interest due to their tremendous potential in bioinspired electronics, smart wearables, and human-machine interfaces. In these applications, it is highly desirable to possess real-time color tunability but this has not been reported yet. Herein, a flexible color-tunable electroluminescent device composed of simple double-stacked emissive layers of ZnS phosphors/dielectric polymer composite is developed by an all-solution processable method. The color tuning capability can be attributed to the dielectric difference between the two emissive layers, leading to the color combination between two independent emissions originating from different ZnS phosphors at varied electric fields. With the rational selection of the dielectric polymer matrices, a wide-range color tuning from orange to white and to blue can be realized in a single device just by varying the electric field. It also exhibits high mechanical robustness with well-maintained performance even after 1000 cycles of bending. Similar natural functionalities like camouflage and visual communication can be further reproduced in the artificial color-tunable system, thereby opening a general and effective avenue for developing smart wearables and soft electronics.

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Bioinspired kirigami metasurfaces as assistive shoe grips

Cited by 78 publications

References 48 publications

Novel Planar Auxetic Metamaterial Perforated with Orthogonally Aligned Oval‐Shaped Holes and Machine Learning Solutions

Novel Planar Auxetic Metamaterial Perforated with Orthogonally Aligned Oval‐Shaped Holes and Machine Learning Solutions

Active-Sensing Epidermal Stretchable Bioelectronic Patch for Noninvasive, Conformal, and Wireless Tendon Monitoring

Flexible Color‐Tunable Electroluminescent Devices by Designing Dielectric‐Distinguishing Double‐Stacked Emissive Layers

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