A review on the energy absorption response and structural applications of auxetic structures

Francisco, Matheus Brendon; Pereira, João Luiz Junho; Oliver, Guilherme Antônio; Silva, Lucas Ramon Roque da; Cunha, Sebastião Simões da; Gomes, Guilherme Ferreira

doi:10.1080/15376494.2021.1966143

Cited by 55 publications

(18 citation statements)

References 142 publications

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“…[19][20][21][22][23] Auxetic structures have mechanical properties superior to conventional structures, [24][25][26][27][28] such as increased shear modulus, [29,30] good indentation resistance, [31,32] enhanced fracture toughness, [33] higher impact resistance, [34,35] variable stiffness, [36,37] and better energy absorption. [38,39] Therefore, auxetic structures have high potential in practical applications, such as collision safety for automobiles, [40] structural protection, [41] and smart sensors. [42,43] With the development of auxetics, many novel 2D and 3D auxetic cellular solids have been proposed, among which auxetic models with re-entrant geometries have been extensively studied such as chiral structures, [44] star structures, [45] and double-arrow structures.…”

Section: Introductionmentioning

confidence: 99%

Quasi‐Static Mechanical Properties of a Modified Auxetic Re‐Entrant Honeycomb Metamaterial

Bao

Ren

et al. 2022

Physica Status Solidi (b)

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Auxetic metamaterials possess superior properties and have drawn extensive attention in the past decades. Herein, two curved ribs are added to the conventional re‐entrant (CRE) honeycomb structure to form a modified auxetic re‐entrant (MRE) honeycomb structure for improving the energy absorption capacity of the structure. In‐plane quasi‐static compression response of the honeycomb in large deformation is numerically explored first. Then, quasi‐static compression test is conducted to verify the validity of the numerical simulation. Both experimental and numerical simulation results reveal that during the quasi‐static compression process, two plateau stresses occur in the load–displacement curves of the structure, and the second plateau stress is much higher than the first one. The occurrence time of the second plateau stress can be controlled by the distance between the concave curved ribs in the structure. The experimental results are in good agreement with the finite element analysis results. Due to their desirable mechanical properties, the MRE honeycomb structures have great potential for applications in civil engineering, vehicle crashworthiness, and protective infrastructure.

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Section: Introductionmentioning

confidence: 99%

Quasi‐Static Mechanical Properties of a Modified Auxetic Re‐Entrant Honeycomb Metamaterial

Bao

Ren

et al. 2022

Physica Status Solidi (b)

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“…Mechanical metamaterials refer to a category of artificial structures with counterintuitive mechanical properties originating in their unit cells [1][2][3][4][5][6]. As one of the most widely studied mechanical metamaterials, auxetic metamaterial defines a kind of materials with special compressive properties, i.e., transverse expansion under uniaxial tension, which is also well known as the negative Poisson's ratio (NPR) property [7][8][9]. Since the first fabrication of NPR foam in 1987 [10], many ordered and disordered auxetic materials/structures have been developed [11], and various NPR mechanical mechanisms, such as re-entrant polygon models [12,13], chiral mechanism [14], rotating polygon models [15] et al have been explored.…”

Section: Introductionmentioning

confidence: 99%

Mechanical behaviors of a novel auxetic honeycomb characterized by re-entrant combined-wall hierarchical substructures

Zhou

Pan

Chen

et al. 2022

Mater. Res. Express

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The current focus of the metamaterials is to further improve their performance by the unit cell innovation, while for the auxetic metamaterials, the compromise between the mechanical properties and auxetic effect still needs more efforts. Given this issue, here we developed a novel auxetic honeycomb, named re-entrant combined-wall (RCW) honeycomb, by introducing four hierarchical substructures to the RE cell. Analytical expressions were derived and used to study the in-plane elastic constants of the RCW honeycomb, which were well confirmed by the established finite element model. Further, we investigated its crushing behaviors under large deformation by the explicit numerical method, and the quasi-static crushing experiments were also carried out by the 3D-printed specimens. Results show that the properties of the proposed RCW honeycomb have a high degree of orthogonality and tunability. Compared with the traditional RE honeycomb, the Young’s modulus of the RCW honeycomb in the y direction increases by more than 120%, and the Poisson’s ratio decreases by about 43%. Besides, behaviors of the cell wall contact induced by the adding substructure can lead to an interesting stress enhancement phenomenon under large deformation, which significantly increases its crushing strength, up to 140%, compared with the RE honeycomb. Therefore, the results in this work effectively demonstrate the improved mechanical properties and auxetic performance of the proposed RCW honeycomb. Besides, the adopted design strategy of hierarchical substructure also exhibits great potential for developing novel and excellent auxetic mechanical metamaterials.

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“…Compared to conventional materials, the energy absorption ability of auxetic materials is also enhanced. 17,[19][20][21][22][23] The damping capacity of the auxetic foams (open cell polyurethane foam) which was developed by Scarpa et al was found to increase by a factor of 10 compared to the conventional foams used to manufacture the NPR ones. 23 All properties are beneficial for armor systems.…”

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confidence: 99%

“…8,16 In contrast to Young’s modulus, the shear modulus of auxetic materials is higher than conventional materials. 8,16,17 In other words, the auxetic materials are easy to deform volumetrically and difficult to shear. 16,18 Furthermore, auxetic materials have enhanced indentation resistance.…”

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confidence: 99%

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Auxetic materials and structures for potential defense applications: An overview and recent developments

Nguyễn,

Fangueiro,

Ferreira

et al. 2023

Textile Research Journal

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Auxetic behavior is a promising new area for use in defense applications. In comparison to a conventional material, an auxetic material has superior properties because of having a negative Poisson’s ratio; it gets broadened when stretched or becomes smaller when compressed. Furthermore, auxetic materials have enhanced properties such as shear resistance, indentation resistance, fracture toughness, energy absorption, and so on. These improved properties make auxetic materials very appealing and have the potential to revolutionize their applications in aerospace, sports, automotive, construction, biomedical engineering, smart sensors, packaging, cushioning, air filtration, shock absorption and sound insulation, and defense personal protective equipment. This article examines the most recent scientific advances in auxetic materials and structures, such as auxetic textiles (fibers, yarns, and fabrics), auxetic textile-reinforced composites, and auxetic foams, as well as their exceptional auxetic behavior and various approaches to achieving them. Although many potential applications have been proposed, actual applications of auxetic materials in defense are still limited. This is an in-depth review article, and its main goal is to serve as a foundation for future studies concerning the topic.

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A review on the energy absorption response and structural applications of auxetic structures

Cited by 55 publications

References 142 publications

Quasi‐Static Mechanical Properties of a Modified Auxetic Re‐Entrant Honeycomb Metamaterial

Quasi‐Static Mechanical Properties of a Modified Auxetic Re‐Entrant Honeycomb Metamaterial

Mechanical behaviors of a novel auxetic honeycomb characterized by re-entrant combined-wall hierarchical substructures

Auxetic materials and structures for potential defense applications: An overview and recent developments

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