In-plane stiffness of the anisotropic multifunctional hierarchical honeycombs

Sun, Yongtao; Wang, Bo; Pugno, Nicola; Wang, Bin; Ding, Qian

doi:10.1016/j.compstruct.2015.06.020

Cited by 53 publications

(30 citation statements)

References 32 publications

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“…The study of hierarchical honeycombs was also carried out for many years. Sun et al [25,26] analyzed the in-plane stiffness of the anisotropic multifunctional hierarchical honeycomb and multifunctional hierarchical honeycombs with negative Poisson's ratio sub-structures based on Euler beam theory. Zhang et al [27] constructed self-similar regular hexagonal hierarchical honeycombs, and concluded that hierarchical organization could improve crush strength and crush force efficiency by carrying out a series of numerical analyses.…”

Section: Introductionmentioning

confidence: 99%

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

Tan

et al. 2019

Composite Structures

142

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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: 99%

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

Tan

et al. 2019

Composite Structures

142

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“…HCHs were found to possess remarkable specific energy absorption. Sun et al [19,20] have evaluated the in-plane stiffness of these hierarchical honeycombs, which was significantly higher than that of the regular honeycomb. Chen and Pugno [21,22] have analyzed the in-plane elastic buckling properties of hierarchical honeycombs and the in-plane elastic properties of hierarchical nano-honeycombs.…”

Section: Introductionmentioning

confidence: 99%

In-plane crashworthiness of bio-inspired hierarchical honeycombs

Yin

Huang

Scarpa

et al. 2018

Composite Structures

104

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Biological tissues like bone, wood, and sponge possess hierarchical cellular topologies, which are lightweight and feature an excellent energy absorption capability. Here we present a system of bio-inspired hierarchical honeycomb structures based on hexagonal, Kagome, and triangular tessellations. The hierarchical designs and a reference regular honeycomb configuration are subjected to simulated in-plane impact using the nonlinear finite element code LS-DYNA. The numerical simulation results show 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. We also propose a parametric study correlating the microstructure parameters (hierarchical length ratio r and the number of sub cells N) to the energy absorption capacity of these hierarchical honeycombs. The triangular hierarchical honeycomb with N = 2 and r = 1/8 shows the highest energy absorption capacity among all the investigated cases, and this configuration could be employed as a benchmark for the design of future safety protective systems.

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“…Mousanezhad et al (2015) investigate structures in which a smaller honeycomb is added in the middle of each honeycomb and connected to the corners like a spider's web. Sun et al (2015) use a triangular pattern as well as a pattern of triangles and hexagons to construct the cell walls of the honeycombs with a substructure. Taylor et al (2012) investigate the use of a hexagon pattern as a substructure for the cell walls.…”

Section: Additive Manufacturing Of Sandwich Coresmentioning

confidence: 99%

Optimization of load introduction points in sandwich structures with additively manufactured cores

Schwenke

Krause

2020

Des. Sci.

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This paper presents how numerical optimization methods, like topology optimization, and new design possibilities through additive manufacturing (AM) can be used for structural improvements of the load introduction points in sandwich structures. A new design approach is presented, which allows a direct load-path optimized integration of the load introduction point into the sandwich core. The corresponding methodical procedure is shown and the application is demonstrated exemplarily for a sandwich structure with a honeycomb core. The advantages for design science are that the new design possibilities of AM can be considered and used when designing the load introduction points. Thus, the additional reinforcements of the sandwich structures to absorb locally introduced forces in the lightweight structure can be minimized. This enables a meaningful technical comparison and it can be decided in the future whether such a design can be used for sandwich structures under economic aspects. In addition, the influence of the initial and boundary conditions on the design is presented and discussed in this paper. The challenges of optimizing multiple load introduction points simultaneously as well as the special aspects to be considered when transferring the design approach to larger sandwich structures are also highlighted.

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In-plane stiffness of the anisotropic multifunctional hierarchical honeycombs

Cited by 53 publications

References 32 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

In-plane crashworthiness of bio-inspired hierarchical honeycombs

Optimization of load introduction points in sandwich structures with additively manufactured cores

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