Quasi-static and dynamic compression behaviors of a novel auxetic structure

Logakannan, Krishna Prasath; Ramachandran, V.; Jayaganthan, R.; Gao, Zhanyuan; Ruan, Dong

doi:10.1016/j.compstruct.2020.112853

Cited by 68 publications

(21 citation statements)

References 25 publications

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“…Elements were removed once the maximum degradation occurred. [21,30] Figure 6a,b shows the comparisons between the simulated and experimental dynamic compressive forces of the RCA structure crushed along the X and Y directions, respectively. A good agreement was obtained between the FE and experimental results.…”

Section: Fe Analysis For Quasistatic and Dynamic Compressionsmentioning

confidence: 99%

“…It was reported that the compression velocity has a significant effect on the resultant stress, hence the ability to dissipate energy. [ 20 ] Logakannan et al [ 21 ] investigated the effect of crushing velocity on the stress–strain curves and Poisson's ratios of a novel auxetic structure when it was quasistatically and dynamically crushed. Qi et al [ 22 ] examined the mechanical properties of a tetrachiral auxetic honeycomb under quasistatic and dynamic compressions.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic and Quasistatic Properties of an Auxetic Structure: A Comparative Study

2022

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Cellular structures have received extensive attention due to their superior mechanical properties and lightweight. When cellular structures are compressed, they significantly deform and effectively dissipate a large amount of energy by undergoing large deformation at relatively low and constant stress. [1,2] Researchers have carried out studies on the modeling of cellular structures, analyzing and investigating their mechanical performance. Many attempts have been made to expand the range of cellular structures either by altering their geometric parameters or by introducing new structures. [3] Therefore, designing novel cellular structures has attracted much attention of many researchers in the hope to enhance mechanical performance.It is possible to have a different deformation pattern, hence different mechanical performance, by changing topologies of cellular structures. The persistent and ongoing efforts in developing cellular structures have led to a new class of cellular structures that show anomalous deformation response such as negative Poisson's ratio (NPR). [4] Auxetic structures can undergo lateral contraction or expansion when they are subjected to uniaxial compression and tension loadings, respectively, exhibiting NPR. [5] Several auxetics are categorized as reentrant honeycomb, chiral honeycomb, double arrowhead honeycomb, star-shaped auxetic structure, and rotating rigid or semirigid units structures. [6][7][8][9][10][11] The unique properties of auxetic structures have offered their potential applications in a variety of engineering practice such as cores for sandwich panels, [12] medical stents, [13] smart filters, [14] sound absorbers, [15] vibration dampers, [16] textiles, [17] seat cushions, [18] and human protection equipment. [19] However, the capability of conventional manufacturing processes to fabricate cellular structures with small and complex unit cells is limited, which has been a barrier for the application of auxetic cellular structures. Thanks to modern manufacturing techniques such as additive manufacturing (AM), which facilitates the fabrication of most structures with internal and external complexity, manufacturing of auxetic structures is now possible. AM refers collectively to a set of manufacturing processes that are digitally driven and fabricate physical parts layer by layer.An extensive body of work was carried out to investigate the mechanical properties of auxetic structures when they are subjected to quasistatic and dynamic loadings. It was reported that the compression velocity has a significant effect on the resultant stress, hence the ability to dissipate energy. [20] Logakannan et al. [21] investigated the effect of crushing velocity on the stressstrain curves and Poisson's ratios of a novel auxetic structure when it was quasistatically and dynamically crushed. Qi et al. [22] examined the mechanical properties of a tetrachiral auxetic honeycomb under quasistatic and dynamic compressions. Results showed that deformation patterns were governed by the compression veloci...

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Section: Fe Analysis For Quasistatic and Dynamic Compressionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic and Quasistatic Properties of an Auxetic Structure: A Comparative Study

2022

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“…The mechanical properties can be conveniently assigned for the ordered auxetic structures through the adjustment of cell topologies and geometric parameters [21,22]. Therefore, considering the requirement of the problems in various engineering applications, an ongoing challenge for the auxetic materials is to explore more novel cell topologies with excellent properties and to explain the relationship between the unit cells and the macroscopic mechanical properties, which has attracted extensive attention from scholars [23][24][25][26][27][28][29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

“…For instance, some scholars proposed to embed additional cell walls such as rhombic ligament [39], horizontal ligament [42] and vertical ligament [43] into the traditional RE cell. Besides, some hybrid cell configurations are also proposed [28,29,31], which usually consist of different cells, to improve the deformation modes and crushing strength of the single RE cell. Hierarchical design is an effective method to improve the mechanical metamaterials, which has been widely used in the conventional hexagonal honeycomb to improve its out-of-plane and in-plane properties [44][45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the evaluation of crushing responses for the novel cell, including its strength and the deformation modes, has gotten more and more attention from scholars [23,27,29,30]. While the majority of the relevant studies are carried out numerically, analytical models and experimental analyses have also been effectively explored, in which the additive manufacturing (AM) technology provides a powerful tool for the rapid verification of novel honeycomb concepts [23,28,68].…”

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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Bending Performance and Crashworthiness Characteristics of Sandwich Beams with New Auxetic Core

2023

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Structures with enhanced mechanical properties and crashworthiness are competing materials in the transport industry to reduce structural weight, and auxetic materials are the ideal choice. Auxetic metamaterials are the class of cellular structures designed to possess negative Poisson's ratio. The current study evaluates newly developed re‐entrant diamond auxetic metamaterial's in‐plane and out‐of‐plane three‐point bending performance. A series of experimental and numerical studies are performed to assess the quasistatic performance and crashworthiness characteristics of 3D‐printed re‐entrant diamond auxetic core and sandwich panels. The results are compared with regular re‐entrant panels of the same unit cell size. The deformation and failure mechanism of both auxetic structures, core and sandwich, are discussed. Real‐time displacement contours on the specimen surface are visualized using advanced image processing and finite‐element methods. The new re‐entrant diamond auxetic members outperformed energy absorption characteristics in in‐plane and out‐plane directions. Compared to the counterpart, the new metamaterial has improved 88.33% and 29.24% in‐plane energy absorption as a core and sandwich, respectively. 13.51% and 13.35% increments in energy absorption as a core and sandwich are observed for re‐entrant diamond structures compared to the regular re‐entrant system in the out‐of‐plane direction.

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Quasi-static and dynamic compression behaviors of a novel auxetic structure

Cited by 68 publications

References 25 publications

Dynamic and Quasistatic Properties of an Auxetic Structure: A Comparative Study

Dynamic and Quasistatic Properties of an Auxetic Structure: A Comparative Study

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

Bending Performance and Crashworthiness Characteristics of Sandwich Beams with New Auxetic Core

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