Auxetic Microstructures

Lim, Teik‐Cheng

doi:10.1007/978-981-15-6446-8_2

Cited by 4 publications

(1 citation statement)

References 167 publications

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“…Compared with traditional materials, the unique 'auxetic' effect of NPR structures [16,17] gives them many novel mechanical properties [18,19], such as higher shear modulus [20], fracture toughness [21], indentation resistance [22], impact resistance [23], and specific energy absorption [24], which makes NPR structures very promising for aerospace, vehicles, air-delivered packaging, and other fields with a wide range of applications [25]. In particular, it is important to note that the inhomogeneity of NPR materials can significantly alter their impact dynamics [26,27], and the alteration of the unit cell microstructure [28] can also have a significant impact on the macro-and microscopic dynamic stress evolution of the material.…”

Section: Introductionmentioning

confidence: 99%

Impact resistance of a double re-entrant negative poisson’s ratio honeycomb structure

Hai,

Chen,

Wang

et al. 2024

Phys. Scr.

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Auxetic metamaterials, usually consisting of cellular solids or honeycombs, exhibit the advantages of high designability and tunability. In particular, the negative Poisson’s ratio (NPR) property endows them with innovative mechanical properties and makes them promising for a wide range of applications. This paper proposes a modified double re-entrant honeycomb (MDRH) structure and explores its Young's modulus and Poisson's ratio through theoretical derivation and finite element analysis. Additionally, it discusses the relationship between these parameters and the concave angle. Furthermore, the deformation mode, nominal stress-strain curve, and specific energy absorption of this MDRH are investigated for different impact velocities and compared with traditional re-entrant honeycomb (TRH) materials. The results show that the MDRH honeycomb structure greatly widens the range of effective modulus and NPR values. At different impact velocities, the MDRH exhibits high plateau stress and specific energy absorption, indicating good impact resistance. These results provide a theoretical foundation for the design and implementation of new energy-absorbing structures.

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Section: Introductionmentioning

confidence: 99%

Impact resistance of a double re-entrant negative poisson’s ratio honeycomb structure

Hai,

Chen,

Wang

et al. 2024

Phys. Scr.

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Novel Tubular Structures with Negative Poisson's Ratio and High Stiffness

Ruan

Ning

Wang

et al. 2020

Physica Status Solidi (b)

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A stiff tubular cellular structure topology is designed by alternatively indenting rectangular contour patterns on the cell ribs. Modified topologies can be obtained by tailoring the geometric parameters. The Poisson's ratios and elastic moduli of the proposed tubular structures with various geometric parameters are determined using finite element method (FEM). Results show that the minimum Poisson's ratio of the proposed structures can reach −0.28. The unit cell topology and orientation can significantly affect the structures deformation behaviors. The structures exhibit mixed mode of bending‐ and stretching‐dominated deformation responses, and show improved specific elastic moduli compared with traditional open‐cell stochastic foams with positive Poisson's ratios. 3D‐printed samples with identical geometric variables to those of the FE models are fabricated, and their Poisson's ratios and stress–strain relationships are determined experimentally, and compared with simulation results. Excellent agreement is achieved between measurements and simulations. The design concept proposed here can be optimized for specific applications via geometric parameters manipulation.

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Deformation Behaviors of Auxetic Warp Knitted Fabrics Based on Reentrant Geometry

Zhao

Chang

Yang

et al. 2021

Physica Status Solidi (b)

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A series of auxetic warp knitted fabrics based on reentrant geometry were developed in our previous study and their Poisson's ratio in the wale direction and course direction can be as low as −0.5 and −0.15, respectively. However, the quantitative relationships between structural parameters and auxetic effect, which can offer a guide to the design and manufacture process, are still unknown. Herein, the aim is to find such relationships. Based on the geometrical analysis, two semiempirical equations between Poisson's ratio and tensile strain are established when stretched in the wale direction and course direction, respectively. The study shows that the established semiempirical equations fit well with experimental results and can be used to predict auxetic effect of fabrics made with the same type of materials and similar structures. With the relationships proposed, warp knitted fabrics can be designed and manufactured directly without trials to obtain the desired auxetic effect, which can largely save the time and cost of production.

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Auxetic Microstructures

Cited by 4 publications

References 167 publications

Impact resistance of a double re-entrant negative poisson’s ratio honeycomb structure

Impact resistance of a double re-entrant negative poisson’s ratio honeycomb structure

Novel Tubular Structures with Negative Poisson's Ratio and High Stiffness

Deformation Behaviors of Auxetic Warp Knitted Fabrics Based on Reentrant Geometry

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