Deformation behaviors and energy absorption of auxetic lattice cylindrical structures under axial crushing load

Guo, Yongguang; Zhang, Jian; Chen, Liming; Du, Bing; Liu, Houchang; Chen, Liliang; Li, Weiguo; Liu, Yizhi

doi:10.1016/j.ast.2019.105662

Cited by 131 publications

(42 citation statements)

References 31 publications

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“…compression) in the direction transverse to the load [1]. Such materials have gained considerable interest from the scientific community over the last decade thanks to their potential applications as stents [2], orthopedic bone plates [3] or skin grafts [4] in medicine, as energy absorbers in sports [5] or crashworthiness situations [6,7], as high sensitivity sensors [8,9], or as highly tunable molecular sieves [10]. The archetype of the auxetic structure is the re-entrant honeycomb network, thanks to its peculiarly designed porosity [6,[11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Non-auxetic/auxetic transitions inducing modifications of the magnetic anisotropy in CoFe2O4 thin films

Martin

Roulland

Grenier

et al. 2020

Journal of Alloys and Compounds

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An auxetic behaviour is evidenced in CoFe2O4 thin films grown by pulsed laser deposition on (100) MgO substrates under various O2/N2 pressures. This rare behaviour for an intrinsic material is observed for intermediate oxidation conditions, in between two non auxetic domains delimited by high (>0.05 mbar) and low (<0.03 mbar) O2/N2 deposition pressures. Combining X-ray resonant diffraction and Mössbauer spectroscopy, we experimentally prove that the auxetic behaviour is related to the presence of cobalt ions in the tetrahedral sites. The impact of the structural modifications caused by the various oxidation conditions on the electronic and magnetic properties are studied for the various oxidation domains. Variations as important as a transition from a p-type semiconducting to an insulating behaviour, or from an in-plane to an out-of-plane magnetization are observed when spanning from the lowest (0.01 mbar) to the highest (1 mbar) studied oxidation pressures.

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Section: Introductionmentioning

confidence: 99%

Non-auxetic/auxetic transitions inducing modifications of the magnetic anisotropy in CoFe2O4 thin films

Martin

Roulland

Grenier

et al. 2020

Journal of Alloys and Compounds

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“…As shown in [15] and [1] by indentation tests on copper foams and on microporous polyethylene, there is an enhancement in hardness when the Poisson's coefficient becomes negative. Several recent numerical and experimental studies show the effectiveness of auxetic lattices for impact absorption [6,12,17,22]. The optimal geometry of the unitary cell of an auxetic material depends on the application and it is largely studied in the literature [16,25,27].…”

Section: Introductionmentioning

confidence: 99%

Bending-Dominated Auxetic Materials for Wearable Protective Devices Against Impact

Faraci

Driemeier

Comi

2020

J. dynamic behavior mater.

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Auxetic metamaterials have high energy absorption capacity and indentation resistance, due to their significant densification mechanism during compression. This study investigates the performance of structured materials in layered thin plates, with potential applications in wearable protective devices for sport activities. Two different 3D lattices, conventional and re-entrant honeycomb, are studied in detail and their dynamic behaviour is compared with that of a 2D auxetic lattice. Initially, the equivalent elastic properties of the proposed geometries are investigated at varying equivalent densities. Then a new lightweight solution of a sandwich structure with an auxetic metamaterial core is proposed for possible application to facial protective masks. Numerical impact analyses of the problem show the potential benefit of the present proposal with respect to traditional mask geometries.

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“…Cases with horizontal and vertical unit cell arrangements were considered. The former exhibit better specific energy absorption for lower and higher velocities as the relative density varies [174]. However, when the same arrangements are made using sandwiched composite panels, the specific energy absorption increases dramatically for both, with lower and higher velocities for varying relative densities.…”

Section: Impact and Ballistic Propertiesmentioning

confidence: 96%

On the application of additive manufacturing methods for auxetic structures: a review

2021

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Auxetic structures are a special class of structural components that exhibit a negative Poisson's ratio (NPR) because of their constituent materials, internal microstructure, or structural geometry. To realize such structures, specialized manufacturing processes are required to achieve a dimensional accuracy, reduction of material wastage, and a quicker fabrication. Hence, additive manufacturing (AM) techniques play a pivotal role in this context. AM is a layer-wise manufacturing process and builds the structure as per the designed geometry with appreciable precision and accuracy. Hence, it is extremely beneficial to fabricate auxetic structures using AM, which is otherwise a tedious and expensive task. In this study, a detailed discussion of the various AM techniques used in the fabrication of auxetic structures is presented. The advancements and advantages put forward by the AM domain have offered a plethora of opportunities for the fabrication and development of unconventional structures. Therefore, the authors have attempted to provide a meaningful encapsulation and a detailed discussion of the most recent of such advancements pertaining to auxetic structures. The article opens with a brief history of the growth of auxetic materials and later auxetic structures. Subsequently, discussions centering on the different AM techniques employed for the realization of auxetic structures are conducted. The basic principle, advantages, and disadvantages of these processes are discussed to provide an in-depth understanding of the current level of research. Furthermore, the performance of some of the prominent auxetic structures realized through these methods is discussed to compare their benefits and shortcomings. In addition, the influences of geometric and process parameters on such structures are evaluated through a comprehensive review to assess their feasibility for the latermentioned applications. Finally, valuable insights into the applications, limitations, and prospects of AM for auxetic structures are provided to enable the readers to gauge the vitality of such manufacturing as a production method.

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Deformation behaviors and energy absorption of auxetic lattice cylindrical structures under axial crushing load

Cited by 131 publications

References 31 publications

Non-auxetic/auxetic transitions inducing modifications of the magnetic anisotropy in CoFe2O4 thin films

Non-auxetic/auxetic transitions inducing modifications of the magnetic anisotropy in CoFe2O4 thin films

Bending-Dominated Auxetic Materials for Wearable Protective Devices Against Impact

On the application of additive manufacturing methods for auxetic structures: a review

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