Improved mechanical characteristics of new auxetic structures based on stretch-dominated-mechanism deformation under compressive and tensile loadings

Etemadi, Ehsan; Gholikord, Mohaddeseh; Zeeshan, Muhammad; Hu, Hong

doi:10.1016/j.tws.2022.110491

Cited by 23 publications

(4 citation statements)

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“…These values are calculated based on the size of the structure before deformation, and normal stress ε is not a localized stress that directly acts on the structure, but rather represents an overall equivalent stress. The definitions for normal stress σ and normal strain ε are as follows: [ 27,28,36 ]

\sigma = \frac{F}{A}

\epsilon = \frac{\Delta H}{H}

the stress σ and strain ε listed in Equation () and () belong to the category of “engineering” stress and strain. Where F represents the reaction force in the impacting end, and A represents the initial cross‐sectional area of the entire structure that is perpendicular to F , and is defined as A = L × b , where b is the thickness of 20 mm in the outward direction of the honeycomb surface, and L and H denote the initial width and initial height of the entire structure, respectively.…”

Section: Designing and Methodsmentioning

confidence: 99%

Section: Normal Stress and Normal Strainmentioning

confidence: 99%

“…In order to improve the energy absorption of honeycomb structures, researchers have proposed a series of new structures aimed at improving energy absorption by combining various existing topological properties to create innovative configurations through hybrid design. [32][33][34][35][36][37] For example, Wang et al [38] introduced a star-arrow honeycomb (SAH) by incorporating a doublearrow honeycomb (DAH) unit into the star-shaped honeycomb (SSH). Under low-velocity impact loading, the stress-strain curves of the SAH reveal two plateau stress regions, with the second level of plateau stress exceeding 3 times that of the first level.…”

Section: Introductionmentioning

confidence: 99%

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In‐Plane Impact Characteristics of Auxetic Rotating Triangular Honeycomb Inspired by a Rotating Rigid Structure

Chen,

Huang,

Deng

2024

Adv Eng Mater

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Inspired by rotating rigid structures, an auxiliary rotating triangular honeycomb structure (ARTH) is designed in this paper. The structure has dual platform stress, which can reduce the initial peak stress generated during collisions, reducing injuries to pedestrians and vehicle occupants. The accuracy of the finite element numerical model is verified by experiments, and a series of researches are carried out. The mechanical properties of the structure at different velocities are studied and the classification diagram of deformation modes is obtained. Under low‐speed impact load, ARTH has two deformation stages and two stress plateau regions, in which the stress of the second plateau is more than twice that of the first plateau. Then, a theoretical model based on plastic dissipation theory predicts the stress platform at different deformation stages under quasi‐static conditions. Parametric analysis shows that increasing wall thickness t can significantly improve the stress platform and energy absorption, but the negative Poisson’s ratio effect is weakened. The influence of angle θ on the first stage deformation of ARTH is significant. These studies can provide some references for the design of double‐platform stress and the reduction of initial peak stress of rotating auxiliary structures.This article is protected by copyright. All rights reserved.

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\sigma = \frac{F}{A}

\epsilon = \frac{\Delta H}{H}

Section: Designing and Methodsmentioning

confidence: 99%

Section: Normal Stress and Normal Strainmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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In‐Plane Impact Characteristics of Auxetic Rotating Triangular Honeycomb Inspired by a Rotating Rigid Structure

Chen,

Huang,

Deng

2024

Adv Eng Mater

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“…Numerous other studies have utilised FEA to investigate several variations based on the 2D re-entrant hexagonal honeycomb systems and Sigmund's double-V model (Figure 1c-i) to simulate their mechanical properties, including in-plane Poisson's ratio and Young's modulus under uniaxial loading [135][136][137][138][139]. Through FEA simulations, several studies were carried out on the shape optimization of the re-entrant honeycombs by analysing the effect of a number of variables on the physical properties.…”

Section: Two Dimensional Systemsmentioning

confidence: 99%

Auxetics and FEA: Modern Materials Driven by Modern Simulation Methods

Galea Mifsud,

Muscat,

Grima-Cornish

et al. 2024

Materials

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Auxetics are materials, metamaterials or structures which expand laterally in at least one cross-sectional plane when uniaxially stretched, that is, have a negative Poisson’s ratio. Over these last decades, these systems have been studied through various methods, including simulations through finite elements analysis (FEA). This simulation tool is playing an increasingly significant role in the study of materials and structures as a result of the availability of more advanced and user-friendly commercially available software and higher computational power at more reachable costs. This review shows how, in the last three decades, FEA proved to be an essential key tool for studying auxetics, their properties, potential uses and applications. It focuses on the use of FEA in recent years for the design and optimisation of auxetic systems, for the simulation of how they behave when subjected to uniaxial stretching or compression, typically with a focus on identifying the deformation mechanism which leads to auxetic behaviour, and/or, for the simulation of their characteristics and behaviour under different circumstances such as impacts.

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