Dual-constituent anti-tetra-chiral lattice metamaterial with tailorable coefficient of thermal expansion and excellent bandgap

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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.

Section: Introductionmentioning

confidence: 99%

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

Hai,

Chen,

Wang

et al. 2024

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“…In addition, they demonstrated that the metamaterial has excellent bandgap properties. Subsequently, Bai [40] et al applied bi-material curved ribs to a novel dual-constituent anti-tetra-chiral lattice metamaterial, which also has negative Poisson's ratio, adjustable thermal expansion and band gap characteristics.…”

Section: Introductionmentioning

confidence: 99%

Impact resistance analysis of a dual-constituent negative Poisson’s ratio lattice metamaterial with tailorable coefficient of thermal expansion

Dong,

Li,

Cui

et al. 2024

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The combination of parameters such as negative Poisson's ratio (NPR) and negative coefficient of thermal expansion (NCTE) can result in novel materials with specialized functions to meet the requirements of multifunctional and multipurpose devices. However, the additional structural design to meet NCTE requires a re-examination of its impact resistance. In this paper, the deformation modes and impact resistance of dual-constituent re-entrant hexagonal lattice metamaterial (DRHLM) with both NPR and NCTE are investigated under different impact velocities, and the nominal stress-strain curves and energy absorption characteristics of DRHLM structures with different arch heights, chord lengths, and angles of the bottom edge ribs and the diagonal ribs are discussed. The results show that the bi-material bending ribs affect the energy absorption of the structure, and in most cases the DRHLM structure has a better energy absorption capacity than the traditional concave hexagonal structure, but too much or too little curvature of the bi-material portion reduces the energy absorption characteristics of the DRHLM structure. In addition, the increase in the pinch angle of the ribs leads to the weakening of the negative Poisson’s ratio effect, which is also detrimental to the energy absorption of the structure. The work done can provide guidance for finding the dimensional parameters of DRHLM structures with optimal energy absorption performance.

“…However, the above study did not consider the band gap characteristics of materials. Bai et al [32] proposed a novel dual-constituent anti-tetra-chiral lattice metamaterial (DATLM) that can realize the regulation of thermal expansion and Poisson's ratio, which was found to have good band gap characteristics and achieved a multi-functional design integrating thermal expansion, NPR, and band gap. However, the research on this aspect is still in the preliminary exploration stage.…”

Section: Introductionmentioning

confidence: 99%

Band gap characteristics of multi-functional lattice metamaterials with adjustable thermal expansion and Poisson's ratio

Liu

Jiang

Xu³

et al. 2023

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The current development of science and technology has put increased demands on the versatility of metamaterials. In this paper, the band gap characteristics of a lattice metamaterial that can simultaneously modulate thermal expansion and Poisson's ratio are studied, the dispersion characteristics of elastic waves propagating in periodic lattice metamaterials are analyzed, and the effects of different structures and parameters on the band gap are discussed. The results indicate that the configuration has excellent band gap properties while satisfying the tunable coefficient thermal expansion (CTE)and Poisson's ratio functions. Through reasonable material selection and shape design, it is expected to achieve a multi-objective win-win for specific thermal expansion properties, Poisson's ratio, and band gap design, resulting in better tunability and versatility of the metamaterial.