Re-Entrant Honeycomb Auxetic Structure with Enhanced Directional Properties

Mustahsan, Farrukh; Khan, Sohaib Z.; Zaidi, Asad A.; Alahmadi, Yaser H.; Mahmoud, Essam R. I.

doi:10.3390/ma15228022

Cited by 11 publications

(5 citation statements)

References 28 publications

(34 reference statements)

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“…The authors developed theoretical models describing the in-plane uniaxial tensile modulus, shear modulus and Poisson's ratios, and verified them through FEA [141]. FEA was also instrumental in validating analytical and experimental methods, as demonstrated in the work by Khan et al [59] and Mustahsan et al [142] (Figure 2e). These used FEA in conjunction with experimental testing to validate the analytical model accounting for the bending, shearing and axial deformation of modified re-entrant honeycomb structures and showed a close agreement between the three methods (numerical, analytical and experimental).…”

Section: Two Dimensional Systemsmentioning

confidence: 92%

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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Section: Two Dimensional Systemsmentioning

confidence: 92%

Auxetics and FEA: Modern Materials Driven by Modern Simulation Methods

Galea Mifsud,

Muscat,

Grima-Cornish

et al. 2024

Materials

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“…In order to achieve this, an insert material can be used, such as foam. Another approach for the same objective would be to modify the geometry, such as the introduction of additional turning points [ 67 ] or additional struts [ 21 ]. Double V, also known as double arrowhead (DAH), geometry is—as the name suggests—based on the shape of an arrowhead [ 68 ].…”

Section: Poisson’s Ratio and Other Mechanical Propertiesmentioning

confidence: 99%

“…Early on, the research was mostly focused on developing a better structural arrangement and analysing its properties (i.e., Poisson's ratio, effective modulus, stiffness, and energy absorption). In terms of its structural arrangement, unique geometries are based on a re-entrant hexagon [17], double-V [18], double-U [19], chiral [20], and even major changes to the already established re-entrant hexagon by adding an additional horizontal component between the vertical parts [21]. Lately, the focus of research in the field of auxetics has gradually shifted to a more practical approach.…”

Section: Introductionmentioning

confidence: 99%

Revolutionizing Prosthetic Design with Auxetic Metamaterials and Structures: A Review of Mechanical Properties and Limitations

et al. 2023

Self Cite

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Prosthetics have come a long way since their inception, and recent advancements in materials science have enabled the development of prosthetic devices with improved functionality and comfort. One promising area of research is the use of auxetic metamaterials in prosthetics. Auxetic materials have a negative Poisson’s ratio, which means that they expand laterally when stretched, unlike conventional materials, which contract laterally. This unique property allows for the creation of prosthetic devices that can better conform to the contours of the human body and provide a more natural feel. In this review article, we provide an overview of the current state of the art in the development of prosthetics using auxetic metamaterials. We discuss the mechanical properties of these materials, including their negative Poisson’s ratio and other properties that make them suitable for use in prosthetic devices. We also explore the limitations that currently exist in implementing these materials in prosthetic devices, including challenges in manufacturing and cost. Despite these challenges, the future prospects for the development of prosthetic devices using auxetic metamaterials are promising. Continued research and development in this field could lead to the creation of more comfortable, functional, and natural-feeling prosthetic devices. Overall, the use of auxetic metamaterials in prosthetics represents a promising area of research with the potential to improve the lives of millions of people around the world who rely on prosthetic devices.

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“…The manipulation of the design parameters at the lattice form can lead to extraordinary mechanical behavior of the engineering parts. For instance, materials with auxetic structures show positive extension in axial and lateral directions when subjected to tensile loading and vice versa when compressed [ 29 , 30 ]. This property is utilized in various engineering applications, such as acoustic isolators, shock absorbers, etc.…”

Section: Introductionmentioning

confidence: 99%

Effects of Wall Thickness Variation on Hydrogen Embrittlement Susceptibility of Additively Manufactured 316L Stainless Steel with Lattice Auxetic Structures

et al. 2023

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In the present study, the hydrogen embrittlement (HE) susceptibility of an additively manufactured (AM) 316L stainless steel (SS) was investigated. The materials were fabricated in the form of a lattice auxetic structure with three different strut thicknesses, 0.6, 1, and 1.4 mm, by the laser powder bed fusion technique at a volumetric energy of 70 J·mm−3. The effect of H charging on the strength and ductility of the lattice structures was evaluated by conducting tensile testing of the H-charged specimens at a slow strain rate of 4 × 10−5 s−1. Hydrogen was introduced to the specimens via electrochemical charging in an NaOH aqueous solution for 24 h at 80 °C before the tensile testing. The microstructure evolution of the H-charged materials was studied using the electron backscattered diffraction (EBSD) technique. The study revealed that the auxetic structures of the AM 316L-SS exhibited a slight reduction in mechanical properties after H charging. The tensile strength was slightly decreased regardless of the thickness. However, the ductility was significantly reduced with increasing thickness. For instance, the strength and uniform elongation of the auxetic structure of the 0.6 mm thick strut were 340 MPa and 17.4% before H charging, and 320 MPa and 16.7% after H charging, respectively. The corresponding values of the counterpart’s 1.4 mm thick strut were 550 MPa and 29% before H charging, and 523 MPa and 23.9% after H charging, respectively. The fractography of the fracture surfaces showed the impact of H charging, as cleavage fracture was a striking feature in H-charged materials. Furthermore, the mechanical twins were enhanced during tensile straining of the H-charged high-thickness material.

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Re-Entrant Honeycomb Auxetic Structure with Enhanced Directional Properties

Cited by 11 publications

References 28 publications

Auxetics and FEA: Modern Materials Driven by Modern Simulation Methods

Auxetics and FEA: Modern Materials Driven by Modern Simulation Methods

Revolutionizing Prosthetic Design with Auxetic Metamaterials and Structures: A Review of Mechanical Properties and Limitations

Effects of Wall Thickness Variation on Hydrogen Embrittlement Susceptibility of Additively Manufactured 316L Stainless Steel with Lattice Auxetic Structures

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