In-plane crashworthiness of bio-inspired hierarchical honeycombs

Yin, Hanfeng; Huang, Xiaofei; Scarpa, Fabrizio; Wen, Guilin; Chen, Yanyu; Zhang, Chao

doi:10.1016/j.compstruct.2018.03.050

Cited by 104 publications

(35 citation statements)

References 30 publications

(29 reference statements)

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“…Yin et al [30] compared three different hierarchical honeycombs, and confirmed that the triangular hierarchical honeycomb has the best crushing performance compared to other two hierarchical honeycombs. Xu et al [31] used the self-similar hierarchical hexagonal columns to improve crashworthiness performance of vehicles.…”

Section: Introductionmentioning

confidence: 98%

In-plane crashworthiness of re-entrant hierarchical honeycombs with negative Poisson’s ratio

Tan

et al. 2019

Composite Structures

144

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Both auxetic structures and hierarchical honeycombs are marked with lightweight and excellent mechanical properties. Here, we combine the characteristics of auxetic structures and hierarchical honeycombs, and propose two re-entrant hierarchical honeycombs constructed by replacing the cell walls of re-entrant honeycombs with regular hexagon substructure (RHH) and equilateral triangle substructure (RHT). The honeycombs are subjected to in-plane impact in order to investigate the crashworthiness by using the commercial software LS-DYNA. The plateau stress of RHH and RHT in x and y directions are derived by a two-scale method. The results from numerical simulation indicate that the specific energy absorption of RHT and RHH is improved by up to 292% and 105%. RHT and RHH improve the mean crushing force value by 298%, 108% respectively compared with the classic re-entrant honeycomb (RH) under quasi-static loading at stress plateau region. The RHT and RHH still have the characteristic of negative Poisson's ratio. Additionally, the parametric studies are further carried out to investigate the effects of impact velocities and relative densities on crashworthiness. All the findings of this study indicate that the proposed two hierarchical honeycombs exhibit an improved crushing performance, and RHT provides the highest energy absorption capacity among all specimens.

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Section: Introductionmentioning

confidence: 98%

In-plane crashworthiness of re-entrant hierarchical honeycombs with negative Poisson’s ratio

Tan

et al. 2019

Composite Structures

144

View full text Add to dashboard Cite

show abstract

“…e comparison of the dynamic crushing mode in Ref. [12] and its simulation was performed, which could be seen in Figure 3. From their comparison, it can be known that the crushing mode and its collapse condition of honeycombs meet with that of existing test specimens well.…”

Section: Validation Of Modelmentioning

confidence: 99%

“…Meanwhile, the nominal plateau stress of honeycomb materials in the same loading conditions reduces as the missing cells increase. According to the axial compressive test, Barnes et al [10] and Chung and Waas [11] investigated the influence of cell configuration on crushing modes of opencell foam metal as well as circular cell polycarbonate honeycombs, respectively, which revealed the mechanism of crushing modes and mechanical behaviors for various honeycomb materials with diverse cell configurations [12] as well as varied loading conditions.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Mechanical Properties and Constitutive Model of Honeycomb Materials with Random Defects under Impact Loading

Jun

Ren

et al. 2019

Shock and Vibration

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The study analyzed the influence of random defects on plateau stresses of honeycomb materials with varied relative densities and established a computational model of honeycomb materials considering random defects. The results show that the plateau stress decreases evidently as the random defects increase, which is closely related to the relative density of honeycomb materials. It also set up a functional relationship between relative plateau stresses and random defects as well as that between relative plateau stresses and relative densities. Taken topological structure, random defects and strain rate effect into consideration, and it proposed a dynamic constitutive model of honeycomb materials under low-middle impact loading. And the proposed constitutive model possesses a better applicability to match the stress-strain relationship of honeycomb materials in existing impact experiments. The proposed constitutive model could make a theoretical foundation in material design and practical application of honeycombs containing random defects.

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“…The numerical and analytical studies indicate that the introduction of structural hierarchy in regular honeycombs results in improved heat resistance and thermal anisotropy. Then, Yin et al [22] studied the in-plane crashworthiness of the hierarchical honeycomb group above, using the nonlinear finite element code LS-DYNA. The numerical simulation results indicate that the triangular hierarchical honeycomb provides the best performance compared to the other two hierarchical honeycombs and features more than twice the energy absorbed by the regular honeycomb under similar loading conditions.…”

Section: Introductionmentioning

confidence: 99%

In-Plane Mechanical Behavior of a New Star-Re-Entrant Hierarchical Metamaterial

et al. 2019

Self Cite

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A novel hierarchical metamaterial with tunable negative Poisson’s ratio is designed by a re-entrant representative unit cell (RUC), which consists of star-shaped subordinate cells. The in-plane mechanical behaviors of star-re-entrant hierarchical metamaterial are studied thoroughly by finite element method, non-dimensional effective moduli and effective Poisson’s ratios (PR) are obtained, then parameters of cell length, inclined angle, thickness for star subordinate cell as well as the amount of subordinate cell along x, y directions for re-entrant RUC are applied as adjustable design variables to explore structure-property relations. Finally, the effects of the design parameters on mechanical behavior and relative density are systematically investigated, which indicate that high specific stiffness and large auxetic deformation can be remarkably enhanced and manipulated through combining parameters of both subordinate cell and parent RUC. It is believed that the new hierarchical metamaterial reported here will provide more opportunities to design multifunctional lightweight materials that are promising for various engineering applications.

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In-plane crashworthiness of bio-inspired hierarchical honeycombs

Cited by 104 publications

References 30 publications

In-plane crashworthiness of re-entrant hierarchical honeycombs with negative Poisson’s ratio

In-plane crashworthiness of re-entrant hierarchical honeycombs with negative Poisson’s ratio

Dynamic Mechanical Properties and Constitutive Model of Honeycomb Materials with Random Defects under Impact Loading

In-Plane Mechanical Behavior of a New Star-Re-Entrant Hierarchical Metamaterial

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