In-plane crushing response of tetra-chiral honeycombs

Qi, Chang; Jiang, Feng; Chen, Yu; Yang, Shu

doi:10.1016/j.ijimpeng.2019.04.019

Cited by 116 publications

(25 citation statements)

References 31 publications

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“…In addition, they analysed the mechanical response of a structure with gradually changing elementary singular cell topology to the deformation process. Chang et al [ 45 ] focused on the in-plane crushing response of tetra-chiral (TC) honeycombs exhibiting auxetic properties. They carried out experimental and numerical investigations taking into account the impact load and quasi-static conditions.…”

Section: Introductionmentioning

confidence: 99%

Deformation Process of 3D Printed Structures Made from Flexible Material with Different Values of Relative Density

et al. 2020

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The main aim of this article is the analysis of the deformation process of regular cell structures under quasi-static load conditions. The methodology used in the presented investigations included a manufacturability study, strength tests of the base material as well as experimental and numerical compression tests of developed regular cellular structures. A regular honeycomb and four variants with gradually changing topologies of different relative density values have been successfully designed and produced in the TPU-Polyflex flexible thermoplastic polyurethane material using the Fused Filament Fabrication (FFF) 3D printing technique. Based on the results of performed technological studies, the most productive and accurate 3D printing parameters for the thermoplastic polyurethane filament were defined. It has been found that the 3D printed Polyflex material is characterised by a very high flexibility (elongation up to 380%) and a non-linear stress-strain relationship. A detailed analysis of the compression process of the structure specimens revealed that buckling and bending were the main mechanisms responsible for the deformation of developed structures. The Finite Element (FE) method and Ls Dyna software were used to conduct computer simulations reflecting the mechanical response of the structural specimens subjected to a quasi-static compression load. The hyperelastic properties of the TPU material were described with the Simplified Rubber Material (SRM) constitutive model. The proposed FE models, as well as assumed initial boundary conditions, were successfully validated. The results obtained from computer simulations agreed well with the data from the experimental compression tests. A linear relationship was found between the relative density and the maximum strain energy value.

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Section: Introductionmentioning

confidence: 99%

Deformation Process of 3D Printed Structures Made from Flexible Material with Different Values of Relative Density

et al. 2020

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“…Fig. 25 displays the calculation models of FSCS with different cell layers, in which 2, 3,4,5,6,7,8,9,10,11,12,13,14 represent different number of cell layers. As the number of cell layers is 2, it means that there are two re-entrant octagon cells along X and Y direction respectively, existing the total number of 2 2 cells.…”

Section: Size Effects Of Unit Cellmentioning

confidence: 99%

“…Zhang X. C. et al analyzed in-plane dynamic crushing behaviors and energyabsorbed characteristics of NPR honeycombs by means of explicit dynamic finite element analysis [12]. Qi C. et al studied in-plane crushing responses of tetra-chiral honeycombs under both quasi-static and dynamic loading conditions [13]. Zhang J. et al explored the dynamic tensile behavior of an auxetic structure with representative re-entrant topology [14].…”

Section: Introductionmentioning

confidence: 99%

Simulation and Experimental Analyses on Quasi-Static and Dynamic Performances of Four-Star Cellular Structure

et al. 2022

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A novel four-star cellular structure (FSCS) is proposed. Firstly, relative density of FSCS, regular octagons and regular hexagons are obtained accordingly. Then, their in-plane quasi-static and dynamic performances are conducted under the premise of equal number of cells, equal mass and equal relative density by adopting Hyperworks and Ls-Dyna software. Macroscopic deformation processes indicate that FSCS, regular octagons and regular hexagons are presented as "compressionshrinkage" negative Poisson's ratio deformation mode, "V" deformation mode and "X" deformation mode, respectively. Subsequently, size effects of unit cell are carried out, and as the number of cell layers reaches no less than 9, platform stress of FSCS gradually tends to be stable. To verify the accuracy of finite element (FE) simulation models, quasi-static compression test is executed on three-dimensional FSCS. The results indicate that FE simulation results agree well with experimental predictions, and the proposed FSCS is equipped with superior energy absorption capability.

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“…[24][25][26] Researchers proposed various designs of auxetic unit cells since the mechanical properties are dominated by the dimensions of the unit cell. 20,21,[27][28][29] Among the various auxetic unit cells, [30][31][32] the re-entrant honeycomb is the most widely studied unit cell by researchers. This study proposed a novel hybrid structure with two strategies for improving the compressive behaviour of re-entrant honeycomb auxetic structure.…”

Section: Introductionmentioning

confidence: 99%

Effect of gradient structure on additively manufactured auxetic and hybrid auxetic structure for energy absorption applications

Bagewadi

Bhagchandani

2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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Additive manufacturing is the most widely used approach to fabricating cellular structures. Research interests in auxetics are increasing due to their unique properties like impact energy absorption. In this work, a novel approach to enhance the mechanical properties of auxetics is proposed. A hybrid auxetic structure is proposed that is the combination of a re-entrant and a conventional honeycomb unit cell. A uniaxial quasi-static compression study is carried out on auxetics and hybrid auxetic structures loaded along the x and y directions. The deformation patterns of the structures are discussed to understand the failure modes. The results showed that the hybrid structure possesses better compressive strength and specific energy absorption than the auxetic structure. Experimental results are closely matching with numerical results. Subsequently, the deformation mode is discussed to understand the structural failure.

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In-plane crushing response of tetra-chiral honeycombs

Cited by 116 publications

References 31 publications

Deformation Process of 3D Printed Structures Made from Flexible Material with Different Values of Relative Density

Deformation Process of 3D Printed Structures Made from Flexible Material with Different Values of Relative Density

Simulation and Experimental Analyses on Quasi-Static and Dynamic Performances of Four-Star Cellular Structure

Effect of gradient structure on additively manufactured auxetic and hybrid auxetic structure for energy absorption applications

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