In-plane dynamics crushing of a combined auxetic honeycomb with negative Poisson's ratio and enhanced energy absorption

Lü, Huan; Wang, Xiaopeng; Chen, Tianning

doi:10.1016/j.tws.2020.107366

Cited by 93 publications

(17 citation statements)

References 47 publications

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“…It should be noted that this effect is not caused by the structural densification, but by the change of deformation mode of the substructure. In similar studies, this mechanism, i.e., using the change of structural deformation mode to improve the crushing strength, is not rare [24,57,68]. However, a considerable part of those structures has a second stress plateau, which is accompanied by a significant stress peak.…”

Section: Discussionmentioning

confidence: 97%

“…Even in the later stage of the compression process, the dynamic Poisson's ratio of the RCW honeycomb is still significantly lower than the RE honeycomb, as shown in figure 13(b). For some existing designs, the auxetic effect may be weakened or completely disappear [32,57], which may not be conducive for the structure to better resist impact using the NPR effect.…”

Section: Discussionmentioning

confidence: 99%

“…During the crushing process, the auxetic honeycomb will occur the transverse shrinkage due to its negative Poisson's ratio. This shrinkage behavior is non-linear, which involves the geometric nonlinearity, plastic deformations and cell wall contact et al Therefore, we used the dynamic Poisson's ratio to reflect the transverse shrinkage at various times, which has been widely used in the studies of honeycomb crushing performance [27,57]. The detailed calculation steps are given in the supplementary materials.…”

Section: Numerical Analysis Of Crushing Responsesmentioning

confidence: 99%

“…Cho et al [56] proposed a novel strategy to construct multilevel hierarchical metamaterials with programmable geometric shapes by the fractal cutting strategy, and confirmed it at both the macroscale and microscale. Nevertheless, for some innovations in the traditional auxetic honeycomb, the added additional walls may limit or weaken the response and the NPR effect of the RE honeycomb [32,43,57]. The compromise between the auxetic performance and the mechanical properties is still an important issue regarding the further application of the RE honeycomb.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Numerical Analysis Of Crushing Responsesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…In addition, Wu et al [20] proposed a fresh concept of changing the angle of the connection between the hexagon and triangle based on the topological structure of the Kagome honeycomb to enhance its energy absorbing capacity and crashworthiness. In the meantime, Lu et al [21] designed a novel combined honeycomb in which the circular cell was put into the center of the star unit cell to explore an efficient route to improve the properties of the honeycomb, in which the deformation modes were analyzed using a theoretical method and simulation. With this trending concept, Wei et al [22] created a new honeycomb by changing the connection type between the star unit cells, and the energy absorption of the traditional star honeycomb was compared with that of the new honeycomb.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Crushing Analysis of Hexagonal-Kagome Combined Honeycomb with Negative Poisson’s Ratio

Wang

Yang

Jun

2022

Advances in Materials Science and Engineering

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To enhance the mechanical performances of traditional honeycombs, a novel combined honeycomb (HKH) was proposed based on the regular hexagonal honeycomb (RHH) and Kagome honeycomb (KH). A systematic investigation of the in-plane dynamic crushing behaviors of the honeycombs was conducted via the finite element method, and the crashworthiness characteristics of the three honeycombs were examined. Using one-dimensional shock wave theory and least squares fitting, a fitting formula of the plateau stress was obtained, and the deformation mechanism of the HKH was determined based on the elastic buckling of the cell wall. The results showed that the HKH exhibited a higher plateau stress than the RHH for any velocity impact, while the negative Poisson’s ratio effect was more significant than that of the KH for low-velocity impacts (the peak Poisson’s ratios of the HKH and KH were −0.312 and −0.286, respectively). Furthermore, the effects of the impact velocity and relative density on the energy absorption and auxetic performances were explored. In this study, a novel design was proposed by combining various cell elements to obtain better crashworthiness, providing a new concept to promote the development of lightweight materials.

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Crushing Behavior and Energy Absorption Performance of a Novel 3D Folded Structure with Negative Poisson's Ratio

Liu

Zhang

et al. 2023

Adv Eng Mater

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A novel 3D folded structure (3D‐FS) with negative Poisson's ratio (NPR) is proposed herein. The deformation mechanism and energy absorption properties are investigated by the experiment and simulation. An analytical model describing the two‐plateau stress phases is presented based on the experimental data. Numerical simulations are performed to analyze the influence of the structural geometry parameters on the plateau stress, energy absorption properties and NPR, and to establish the relationship between specific energy absorption and wall thickness ratio for the two‐plateau stress phases. A comparison of NPR and energy absorption is performed with the warp and woof periodic auxetic cellular structure (WWPACS). The results show that 3D‐FS has an obvious NPR effect and bistable performance under compressive loading. With the star re‐entrant angle increasing, the first‐plateau stress increases while the second‐plateau stress decreases; meanwhile, the NPR effect and energy absorption capacity are enhanced. The NPR effect of 3D‐FS is more evident than that of WWPACS, and the maximum NPR is 1.14 times of WWPACS. The specific energy absorption (SEA) of 3D‐FS is 2.21 times larger than that of WWPACS when the compressive compression strain is 0.60.

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In-plane dynamics crushing of a combined auxetic honeycomb with negative Poisson's ratio and enhanced energy absorption

Cited by 93 publications

References 47 publications

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

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

Dynamic Crushing Analysis of Hexagonal-Kagome Combined Honeycomb with Negative Poisson’s Ratio

Crushing Behavior and Energy Absorption Performance of a Novel 3D Folded Structure with Negative Poisson's Ratio

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