Experimental and numerical research on foam filled re-entrant cellular structure with negative Poisson's ratio

Yu, Rong; Luo, Wei; Yuan, Hua; Liu, Jingxi; He, Wentao; Yu, Zixian

doi:10.1016/j.tws.2020.106679

Cited by 73 publications

(14 citation statements)

References 44 publications

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“…This phenomenon can be explained from two aspects: one is excellent elasticity and good toughness of PA Film, the other one is the stronger shear resistance, fracture toughness and cracks propagation resistance of BSH-NPR structure. [28][29][30] It is particularly worth mentioning here that releasing the strain enables re-joining of electrode contacts (albeit incomplete) to recover conductivity when electrode is stretched until contact points completely separated and is non-conductive. This is enough to demonstrate that flexible electrodes prepared in this paper have certain self-recovery.…”

Section: Stretching Testingmentioning

confidence: 99%

“…[1][2][3][4][5] However, conductivity of flexible electronic devices can't be guaranteed due to the lack of reliability of existing flexible electrodes under various deformation and many other fields due to unique auxetic properties and outstanding mechanical properties including stronger shear resistance, fracture toughness and cracks propagation resistance, etc. [27][28][29][30][31][32] It is worth mentioning that the NPR structure has been reported many times to have the ability to improve flexible electrode mechanical performance. [33][34][35][36][37] Weng et al compared between thin film electrode and NPR electrode, it is found that the stress level in the NPR electrode is relatively low due to the faster appearance of the inelastic deformation.…”

Section: Introductionmentioning

confidence: 99%

“…The negative Poisson's ratio (NPR) structure has been successfully employed in flexible electronic, biomedicine, sensor and many other fields due to unique auxetic properties and outstanding mechanical properties including stronger shear resistance, fracture toughness and cracks propagation resistance, etc. [ 27–32 ] It is worth mentioning that the NPR structure has been reported many times to have the ability to improve flexible electrode mechanical performance. [ 33–37 ] Weng et al.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Highly Flexible and Conductive Electrodes through Combining Honeycomb and Butterfly Pattern Bio‐Inspired Structure for ECG Signal Recording

Hou

Wang

Han

et al. 2022

Adv Materials Inter

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conditions, which hinders the development of flexible electronics as an emerging technology. [6][7][8][9][10] Ideally, a flexible electrode should be provided reliable conductivity and mechanical flexibility at the same time. [11,12] Therefore, a key problem that should be solved at present to obtain a flexible electrode with these two properties simultaneously.Currently, flexible electrode with metal film based on a flexible substrate is widely utilized due to the inherent excellent flexibility, high conductivity, simple processing and low cost. [13][14][15][16][17] Hence, some investigators have fabricated metal films on flexible substrates (e.g., polydimethylsiloxane (PDMS), polyimide (PI) and polyethylene terephthalate (PET), etc.) to realize the use of flexible electrodes in flexible electrons. For example, Wu et al. reported a flexible PDMS-based three-electrode sensor, which was flexible without inducing irreversible deformation or fatigue after electrochemical testing with forced deformations. [18] Xie et al. manufactured a patterned microelectrode array on PI substrate by photolithography, stripping and sputtering deposition processes, forming a wireless cortical electroencephalogram (EEG) recording system with excellent biocompatibility and flexibility. [19] Liu et al. fabricated a three-layer dry electrode based on PI substrate for detecting electrophysiological signals utilizing sacrificial-layer assisted one-step transfer printing method, which exhibits excellent conformability and stretchability and low electrode-skin contact impedance. [20] Liu et al. designed and fabricated a flexible microthree-dimensional temperature sensor with excellent stability and reliability on PI film by a microfabrication process to achieve in situ real-time temperature measurements. [21] Nonetheless, metal film of most flexible electrodes with flexible substrates often produces microcracks due to complex deformation of substrate, which eventually leads to the surface fracture of the metal film and then affects the conductivity of the electrode. Emergence of the issue will seriously shorten the service life of flexible electrode in flexible electronic equipment. [22][23][24][25][26] Consequently, a key challenge for designing independent high-performance electronic equipment is developing stretchable electrodes that can maintain metal film structural integrity during repeated severe deformations.The negative Poisson's ratio (NPR) structure has been successfully employed in flexible electronic, biomedicine, sensor Recent advances in the development of flexible electronic devices have increased the demand for flexibility and conductivity. However, there is still a significant challenge to manufacture flexible electrodes featuring satisfactory mechanical and conductivity performance simultaneously. In this paper, based on synergistically combining theoretical structural design and screen printing, a new flexible electrode with butterfly-shaped honeycomb (BSH) negative Poisson's ratio (NPR) structure through combining honeyc...

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Section: Stretching Testingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Highly Flexible and Conductive Electrodes through Combining Honeycomb and Butterfly Pattern Bio‐Inspired Structure for ECG Signal Recording

Hou

Wang

Han

et al. 2022

Adv Materials Inter

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show abstract

“…Relevant reports have endlessly emerged. There are many types of foam, such as organic foams, including polypropylene (EPP), 20 polyurethane (PU) 21,22 and graphene-reinforced PU foam, 23 and inorganic foams, including metal foam 24 and foam concrete. 25,26 For the study of mechanical properties, the finite element method has been used 27,28 to determine the effective elastic properties, and studies of the in-plane and out-of-plane compression properties 29 and quasi-static compression and dynamic impact properties 20,30 have also been performed.…”

Section: Introductionmentioning

confidence: 99%

The compressive mechanical properties of honeycomb plates and beetle elytron plates with different foam densities and height-to-thickness ratios

Chen

Hao

et al. 2022

Jnl of Sandwich Structures & Materials

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To investigate a new type of bionic energy-saving sandwich plate—the beetle elytron plate (BEP), the compressive mechanical properties of short basalt fiber reinforced epoxy resin composite BEPs and honeycomb plates with different polyvinyl chloride foam densities and height-to-thickness ratios were investigated. The mechanism of the coupling effect of the core structure, foam density and height-to-thickness ratio was revealed by observing the failure mode of the outer and inner ring honeycomb walls. This study can provide useful instruction for designing lightweight sandwich structures and accelerate the application of BEPs in engineering.

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“…12 It is an important topic to combine the auxetic structures with other materials or structures to improve mechanical properties of the auxetic structures. [13][14][15] In order to improve the stiffness of the auxetic structures, Fu et al 16,17 proposed two kinds of the composite auxetic structures that embed the x-structure and rhombic structure into the re-entrant structures, in which the effects of adjusting the angle of the proposed composite auxetic structures on Poisson's ratio and Young's modulus were studied. Chen et al 18 designed a combined enhanced honeycomb structure based on two existing embedded enhanced honeycombs.…”

Section: Introductionmentioning

confidence: 99%

Study of mechanical properties and enhancing auxetic mechanism of composite auxetic structures

Shi

Wang

et al. 2021

Engineering Reports

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The auxetic structures attract much attention because of their good properties, such as enhanced energy absorption capacity and buckling resistance. It is an important topic to combine the auxetic structures with other materials or structures to improve their mechanical properties. In this paper, a composite auxetic structure was proposed, in which the embedded structure and re-entrant structure can deform independently to adjust the mechanical properties. Under uniaxial compression, the effects of changes in the embedded structure and re-entrant structure on Poisson's ratio, relative Young's modulus, and energy absorption of the composite auxetic structure were studied. By introducing the rate of change of mechanical properties, the effects of the embedded structure and re-entrant structure on the composite auxetic structure were studied. The results show that changing the embedded structure for Poisson's ratio and relative Young's modulus and changing the re-entrant structure for energy absorption can maximize the material utilization. And changing the re-entrant structure can make the mechanical properties of the composite auxetic structure reach a larger adjustable range. This study can provide a new way for the combination of future auxetic structures to meet the needs of different applications in civil engineering.

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Experimental and numerical research on foam filled re-entrant cellular structure with negative Poisson's ratio

Cited by 73 publications

References 44 publications

Highly Flexible and Conductive Electrodes through Combining Honeycomb and Butterfly Pattern Bio‐Inspired Structure for ECG Signal Recording

Highly Flexible and Conductive Electrodes through Combining Honeycomb and Butterfly Pattern Bio‐Inspired Structure for ECG Signal Recording

The compressive mechanical properties of honeycomb plates and beetle elytron plates with different foam densities and height-to-thickness ratios

Study of mechanical properties and enhancing auxetic mechanism of composite auxetic structures

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