Investigation of the auxetic oval structure for energy absorption through quasi-static and dynamic experiments

Linforth, Steven; Ngo, Tuan; Tran, Phuong; Ruan, Dong; Odish, Rami

doi:10.1016/j.ijimpeng.2020.103741

Cited by 63 publications

(13 citation statements)

References 46 publications

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“…The oval is a catch-all term for a family of 2D non-centrosymmetric particles that include circles, ellipses, egg-shaped particles, and other convex-shaped particles with smooth contours, as shown in Figure 2 . It has been widely used to characterize the essential features of components in materials [ 29 , 30 ] due to its extensive representation. Based on the geometric features of the oval particles in Figure 2 , the profile of ovals can be simply treated as an extension of ellipses, and their mathematical expression can be described by Equation (1).…”

Section: Modeling and Methodsmentioning

confidence: 99%

A Numerical Study of ITZ Percolation in Polyphase Concrete Systems Considering the Synergetic Effect of Aggregate Shape- and Size-Diversities

et al. 2023

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The percolation of the interfacial transition zone (ITZ) is generally regarded as an important factor that may accelerate the penetration of aggressive agents in concrete materials, and its threshold is largely determined by the features of aggregates. In most numerical studies about ITZ percolation, both fine aggregates and coarse aggregates are assumed to be the particles of uniform shape, and their size distributions are generally strung together by a single function, which is quite different from reality. To quantify the ITZ percolation associated with the polydispersity of aggregate shapes and size gradations in a more realistic way, the two-dimensional (2D) meso-scale model of concrete is generated by simplifying coarse aggregates and fine aggregates as polygons and ovals, respectively. Moreover, the size gradations of them are also represented by two separate expressions. By combining these models with percolation theory, the percolation of ITZ in the 2D case is explicitly simulated, and the influence of aggregate shape- and size-diversities on the critical threshold ϕagg,c is studied in detail. Based on the simulated results of ϕagg,c, an empirically analytical expression is further proposed to fast predict the ITZ percolation, and its reliability is verified. The results show that the ITZ thickness, average aggregate fineness, coarse aggregate shape, and fine aggregate shapes are the four main contributing factors to the ITZ percolation. Compared with the existing literature, the proposed model here has a broader range of applications (e.g., mortar, concrete, and other granular systems) in the 2D case and can provide the larger predicted results, which may be closer to reality.

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Section: Modeling and Methodsmentioning

confidence: 99%

A Numerical Study of ITZ Percolation in Polyphase Concrete Systems Considering the Synergetic Effect of Aggregate Shape- and Size-Diversities

et al. 2023

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“…Linforth et al [11] have partially solved the problem of heavy weight and low energy absorption by presenting an oval perforated structure that removes material to reduce weight and increase energy absorption capacity. Other factors that affect the energy absorption capacity of metamaterials include temperature treatment, test conditions, geometries, fiber types, and substrates, as listed in the study by Fazita et al [12].…”

Section: Introductionmentioning

confidence: 99%

Energy absorption capacity under tensile and compressive loads of auxetic metamaterial structures

Nhat Nguyen,

Vu,

Nguyen

2023

IOP Conf. Ser.: Earth Environ. Sci.

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An auxetic metamaterial is a mechanical metamaterial with a negative Poisson’s ratio. When compressed or stretched in one direction, it contracts or expands in a perpendicular direction. This review paper focuses on the energy absorption of auxetic metamaterial structures and their applications. Starting with the original structure proposed by D. Han et al., another structural model with heuristically enhanced ribs is proposed to suit the structure’s anisotropy, reduce mass, and increase energy absorption. An extension to this is the newly designed MH-1 model, which is lightweight compared to commonly reported auxetic forms. Numerical results show that MH-1 has the best specific energy absorption and exhibits an obvious auxetic effect under tension, with symmetrical and stable deformation modes. Auxetic metamaterials are also progressively finding applications in the biomedical field. One of the most promising applications of auxetic is in the development of new and improved prosthetics and implants.

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“…They are typically known for their negative Poisson's ratio, meaning that, likewise conventional materials, they expand/contract laterally under uniaxial traction/compression. This behavior leads to improved shear stiffness [13,14], increased indentation resistance [15][16], remarkable fracture toughness [17] and high energy absorption capabilities [18,19]. Among all these, their light weight and energy absorption properties make these structures particularly attractive and useful in some modern applications.…”

Section: Introductionmentioning

confidence: 99%

Energy Absorption Enhancement by Unit Cell Angle Grading or Sandwich Panels with Auxetic Core

Mocian¹,

Constantinescu²,

Baciu³

et al. 2022

Mater. Plast.

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Architectured structures, particularly auxetic materials, have demonstrated encouraging applications in energy absorption as they facilitate the customization of their structural response. Specific geometries of unit cells can thus be tailored for particular needs due to recent progress in additive manufacturing techniques. This paper experimentally studies how the grading of the cell unit angle of an auxetic core in a sandwich panel affects its energy absorbing capability and structural response. 3D printed sandwich panels with uniform and graded auxetic cellular core were tested under quasistatic compression. The results show that sandwich panels with graded core exhibit much better energy absorption capabilities with higher plateau stress and densification strain. This indicates that, by appropriately controlling its geometry, auxetic structures can show further potential as core in sandwich panels for energy absorption applications.

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Investigation of the auxetic oval structure for energy absorption through quasi-static and dynamic experiments

Cited by 63 publications

References 46 publications

A Numerical Study of ITZ Percolation in Polyphase Concrete Systems Considering the Synergetic Effect of Aggregate Shape- and Size-Diversities

A Numerical Study of ITZ Percolation in Polyphase Concrete Systems Considering the Synergetic Effect of Aggregate Shape- and Size-Diversities

Energy absorption capacity under tensile and compressive loads of auxetic metamaterial structures

Energy Absorption Enhancement by Unit Cell Angle Grading or Sandwich Panels with Auxetic Core

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