Effect of negative Poisson's ratio on the fracture mechanics parameters due to mechanical and thermal loads

Li, J.E.; Wang, B.L.

doi:10.1016/j.ijengsci.2020.103256

Cited by 19 publications

(3 citation statements)

References 23 publications

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“…NPR materials have higher energy release rate at the crack tip and good notch resistance because the stress distribution of NPR materials is more uniform than positive ones. 52 Meanwhile, the shear modulus (G) of the anisotropic material is proportional to the elastic modulus (E) when the Poisson's ratio (ν) is greater than −1, which can be easily deduced from the relationship of G = E/[2(1 + ν)]. Thus, NPR materials have the characteristics of high shear modulus.…”

Section: Resultsmentioning

confidence: 99%

“…We supposed the irregular phenomenon was related to the non-uniform stress distribution, which affected the molecular movement of PDMS and PVDF significantly. NPR materials have higher energy release rate at the crack tip and good notch resistance because the stress distribution of NPR materials is more uniform than positive ones . Meanwhile, the shear modulus ( G ) of the anisotropic material is proportional to the elastic modulus ( E ) when the Poisson’s ratio (ν) is greater than −1, which can be easily deduced from the relationship of G = E /[2(1 + ν)].…”

Section: Resultsmentioning

confidence: 99%

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Auxetic Wearable Sensors Based on Flexible Triboelectric Polymers for Movement Monitoring

Xian

et al. 2022

ACS Appl. Polym. Mater.

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The methods to enhance the output voltage of triboelectric nanogenerators based on polymeric dielectric materials, such as building micro−nano structure and chemical modification, probably lower the structural uniformity of their devices and then decrease the performance stability because of stress aggregation. Here, we proposed a strategy based on auxetic structures for improving the triboelectric performance, which could concurrently uniformize the stress transfer due to their excellent friction properties. Using the negative Poisson's ratio (NPR) structure of the "I"-shaped structure and rotating polygon structure, we prepared the dielectric layers of polyvinylidene fluoride (PVDF) and copper with controllable Poisson's ratio from 0.84 to −1.51. Then, the finite element analysis proved that the auxetic NPR structure with tri-axial and tetra-axial symmetricity offered more uniform friction−force distribution and thus less fluctuation in a contact area than the "I"-shaped structure. We further designed triboelectric devices with polydimethylsiloxane (PDMS) deformation and triboelectric properties, and they showed that the triboelectric output voltage reached the maximum when their Poisson's ratio was close to 0, which was related to the minimal change in the contact area between the NPR layer and the PDMS layer. The devices were then inserted into wearable sports sensors, which could monitor the movement at different places of bodies and also have great potential in sensorium smart socks and brake sensors.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Auxetic Wearable Sensors Based on Flexible Triboelectric Polymers for Movement Monitoring

Xian

et al. 2022

ACS Appl. Polym. Mater.

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“…Negative Poisson's ratio (NPR) metamaterial, also known as auxetic metamaterials, is one of the most widely studied mechanical metamaterials. They exhibit exceptional energy absorption and high fracture resistance due to the expansion of periodic cell structures under compression [2][3][4]. Zero Poisson's Ratio (ZPR) metamaterials have become more popular since they do not exhibit transverse displacements and undesirable double curvatures under in-plane longitudinal loads and outof-plane bending moments [5].…”

Section: Introductionmentioning

confidence: 99%

Cylindrical helical cell metamaterial with large strain zero Poisson’s ratio for shape morphing analysis

Qin,

Dayyani

2023

Smart Mater. Struct.

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In this paper, a novel cylindrical metamaterial with helical cell exhibiting zero Poisson’s ratio (ZPR) in two different directions is introduced. Detailed Computer-aided design modelling of a curved optimised spring element is demonstrated for numerical and experimental analysis. High fidelity finite element models are developed to assess the homogenisation study of Poisson’s ratios, normalised Young’s modulus and torsion behaviour, demonstrating the curvature effect and independency of mechanical behaviour of cylindrical optimised spring element metamaterial from tessellation numbers. Buckling and frequency analysis of the cylindrical metamaterial with spring element are compared with equivalent shell cylinders. Moreover, experimental analysis is performed to validate the large strain ZPR and deformation mechanism demonstrated in numerical simulations. Finally, radical shape morphing analysis under different bending conditions for cylindrical metamaterial with helical cell is investigated, including deformation and actuation energy and compared with positive and negative Poisson’s ratio cylinders formed by honeycomb and auxetic cells.

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A porous layer of negative value of Poisson’s ratio under a flat-ended and rigid cylinder indenter

Wang

2022

Arch Appl Mech

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Effect of negative Poisson's ratio on the fracture mechanics parameters due to mechanical and thermal loads

Cited by 19 publications

References 23 publications

Auxetic Wearable Sensors Based on Flexible Triboelectric Polymers for Movement Monitoring

Auxetic Wearable Sensors Based on Flexible Triboelectric Polymers for Movement Monitoring

Cylindrical helical cell metamaterial with large strain zero Poisson’s ratio for shape morphing analysis

A porous layer of negative value of Poisson’s ratio under a flat-ended and rigid cylinder indenter

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