Mechanical properties of anti-tetrachiral auxetic stents

Wu, Wenwang; Song, Xiaoke; Liang, Jun; Xia, Re; Qian, Guian; Fang, Daining

doi:10.1016/j.compstruct.2017.11.048

Cited by 167 publications

(75 citation statements)

References 23 publications

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“…For tetrachiral hybrid metastructures, corresponding in‐plane elastic modulus and Poisson's ratio can be written as:

E_{x} = true(\frac{E_{c} β^{3}}{α_{x} α_{y}} true) true(\frac{1}{true(\sqrt{α_{y}^{2} - {true(2 - β true)}^{2}} - 2 \sqrt{2 β - β^{2}} true)} + \frac{1}{3 true(α_{x} - 2 \sqrt{2 β - β^{2}} true)} true) {true(\frac{α_{x}}{2 - β} true)}^{2}

and

E_{y} = true(\frac{E_{c} β^{3}}{α_{x} α_{y}} true) true(\frac{1}{true(\sqrt{α_{y}^{2} - {true(2 - β true)}^{2}} - 2 \sqrt{2 β - β^{2}} true)} + \frac{1}{3 true(α_{x} - 2 \sqrt{2 β - β^{2}} true)} true) {true(\frac{α_{y}}{2 - β} true)}^{2}

…”

Section: Mechanical Design Of Irregular Chiral Metastructuresmentioning

confidence: 99%

“…As a special type of auxetic materials, chiral metastructures cannot be superimposed onto its mirror body by simple rigid rotations and spatial translations. Normally, chiral structures are architected with nodes and ligaments in 2D or 3D spaces, and has been proposed for various types of industrial applications, such as: morphing airfoil, expanding antenna, auxetic stent, etc . Systematical theoretical, simulation and experimental investigations on the mechanical properties of chiral metastructures are performed in the past decades.…”

Section: Introductionmentioning

confidence: 99%

“…Systematical theoretical, simulation and experimental investigations on the mechanical properties of chiral metastructures are performed in the past decades. Meanwhile, several types of advanced manufacturing techniques are employed for fabricating chiral industrial components, such as: resin transfer molding (RTM) process for composite chiral airfoil, selective laser melting (SLM) metal additive manufacturing of gradient chiral metastructures for impact energy absorption . However, industrial manufacturing defects are inevitably for chiral components and structures, inducing strong or weak local defects into the structures, which may have remarkable impacts on the mechanical integrity of chiral structures.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Disordered Circular Nodes Dispersion and Missing Ligaments on the Mechanical Properties of Chiral Structures

Niu

Liang

et al. 2019

Physica Status Solidi (b)

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Auxetics with negative Poisson's ratio (NPR) can expand dimensions along the direction perpendicular to the tensile direction, such as rigid rotation, reentrant and chiral structures, etc. The mechanical performances of chiral metastructures are closely related to internal defects and interactions between defects. In this paper, two types of irregular chiral structures with Gaussian dispersion of circular node positions and missing ligaments are designed, namely: antitetrachiral metastructure and tetrachiral hybrid metastructure. These two types of chiral metastructures are characterized by node radius, ligament thickness, ligament length, the circular node center dispersion range, and missing ligament percentages. Effects of random node distribution range and cell wall missing percentage on the elastic modulus and Poisson's ratio of chiral metastructures are investigated through experimental tests and finite element (FE) simulation systematically. Through dimensionless analysis, it is found that ligament thickness has remarkable influence on the negative Poisson's ratio. Effect of missing ligament on the mechanical properties of the structure is greater than effect of random node center dispersion. With the increase of ligament missing percentage, the resultant modulus of chiral metastructures decreases, and the corresponding NPR increases.

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“…For tetrachiral hybrid metastructures, corresponding in‐plane elastic modulus and Poisson's ratio can be written as:

E_{x} = true(\frac{E_{c} β^{3}}{α_{x} α_{y}} true) true(\frac{1}{true(\sqrt{α_{y}^{2} - {true(2 - β true)}^{2}} - 2 \sqrt{2 β - β^{2}} true)} + \frac{1}{3 true(α_{x} - 2 \sqrt{2 β - β^{2}} true)} true) {true(\frac{α_{x}}{2 - β} true)}^{2}

and

E_{y} = true(\frac{E_{c} β^{3}}{α_{x} α_{y}} true) true(\frac{1}{true(\sqrt{α_{y}^{2} - {true(2 - β true)}^{2}} - 2 \sqrt{2 β - β^{2}} true)} + \frac{1}{3 true(α_{x} - 2 \sqrt{2 β - β^{2}} true)} true) {true(\frac{α_{y}}{2 - β} true)}^{2}

…”

Section: Mechanical Design Of Irregular Chiral Metastructuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Disordered Circular Nodes Dispersion and Missing Ligaments on the Mechanical Properties of Chiral Structures

Niu

Liang

et al. 2019

Physica Status Solidi (b)

Self Cite

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show abstract

“…Li et al proposed a tetra‐chiral and anti‐tetra‐chiral hybrid structure, and carried out theoretical and experimental research on its mechanical properties. Wu et al proposed a kind of stent composed of anti‐tetra‐chiral structures with circular and elliptical nodes and the corresponding hierarchical structures, and carried out research on its auxetic mechanical behavior. Xia et al theoretically analyze the elastic modulus of the 3D isotropic anti‐tetra‐chiral structure and the structural samples were prepared using Nylon SLS technology and experimentally studied.…”

Section: Introductionmentioning

confidence: 99%

Research on In‐plane Quasi‐Static Mechanical Properties of Gradient Tetra‐Chiral Hyper‐Structures

Zhu

et al. 2019

Adv Eng Mater

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Chiral hyper-structure is a family of lightweight structure with negative Poisson's ratio, which leads benefit in mechanical properties and designability. In order to further improve some mechanical properties of chiral hyperstructures, the concept of gradient is introduced into the structure. Five groups of gradient tetra-chiral hyper-structure with different gradient factors are fabricated based on waterjet cutting technology, and the in-plane quasistatic lateral compression tests are carried out. Finite element models are developed for the in-plane linear elastic mechanical properties and plastic deformation modes under lateral compression condition. Theoretical prediction models of elastic modulus in gradient direction and Poisson's ratio of the gradient tetra-chiral hyper-structure is derived based on geometric assumptions and inhomogeneous deformation mode which are verified by experiments and finite element analysis. Simultaneously, the effects of gradient factors on the deformation characteristics and mechanical behaviors of the tetra-chiral hyper-structure are discussed and analyzed.

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“…In an effort to decrease and control the interior noise and levels of vibration of not only the above-mentioned vehicles but also other equipment, devices and machines, many techniques have been developed: 1 noise source identification (NSI) techniques [2][3][4][5][6][7][8][9][10] and active and passive control methods. [11][12][13][14][15] In particular, passive controls can benefit of the use of innovative materials, such as piezoelectrics, shape memory alloys, 11 magnetostrictive materials 12 and chiral unit cells, [13][14][15][16][17][18] and their mechanical properties can be designed within very large range of modulus and Poisson's ratio values. Active controls require external power sources and complex controllers.…”

Section: Introductionmentioning

confidence: 99%

Loudness calculation procedure to study electronic steering column lock noise measurement

Maffiodo

Sesana

2019

Advances in Mechanical Engineering

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In the automotive field, the customer requirements for low interior noise and pleasant sound quality inside a vehicle are getting higher and higher. Various national and international regulatory authorities established and reviewed vehicle interior noise for the past years. Besides, lots of studies have shown that vehicle noise can influence the driver's perceptions and also his or her driving capabilities. To succeed in this scenario, all manufacturers are investing in technology and research in order to improve their component performance. Working on the noise source so as to reduce the seriousness of these noise problems can be really effective. However, various engineering techniques are available to deal with noise and sound-measuring instruments, and systems can help to identify the nature of the problem and they can also be helpful in determining the right procedure to analyse the noise problem. This work proposes a procedure to evaluate the noise originated from an electronic steering column lock device which is used to lock and unlock the steering wheel according to European safety requirements. In particular, different standards and requirements for loudness evaluation have been discussed and the formulation of a straightforward procedure, which can be used to evaluate the loudness according to costumer's requirements, is defined.

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Mechanical properties of anti-tetrachiral auxetic stents

Cited by 167 publications

References 23 publications

Effects of Disordered Circular Nodes Dispersion and Missing Ligaments on the Mechanical Properties of Chiral Structures

Effects of Disordered Circular Nodes Dispersion and Missing Ligaments on the Mechanical Properties of Chiral Structures

Research on In‐plane Quasi‐Static Mechanical Properties of Gradient Tetra‐Chiral Hyper‐Structures

Loudness calculation procedure to study electronic steering column lock noise measurement

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