Compression twist deformation of novel tetrachiral architected cylindrical tube inspired by towel gourd tendrils

Wu, Wenwang; Geng, Luchao; Niu, Yinghao; Qi, Dexing; Cui, Xinguang; Fang, Daining

doi:10.1016/j.eml.2018.02.001

Cited by 106 publications

(24 citation statements)

References 22 publications

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“…Finite element results and experimental measures have been also compared to assess the coupled extensional and torsional deformations of microstructured cylindrical shells fabricated using selective laser sintering and selective laser melting methods with nylon and aluminium alloy [29]. Within this comparative study, the effects of a reinforcing rotation disk introduced at the cylinder mid-height have been also considered [30]. High-pressure abrasive waterjet technologies have been applied to realize functionally graded tetrachiral structures.…”

Section: Introductionmentioning

confidence: 99%

A novel layered topology of auxetic materials based on the tetrachiral honeycomb microstructure

et al. 2019

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Microstructured honeycomb materials may exhibit exotic, extreme and tailorable mechanical properties, suited for innovative technological applications in a variety of modern engineering fields. The paper is focused on analysing the directional auxeticity of tetrachiral materials, through analytical, numerical and experimental methods. Theoretical predictions about the global elastic properties have been successfully validated by performing tensile laboratory tests on tetrachiral samples, realized with high precision 3D printing technologies. Inspired by the kinematic behaviour of the tetrachiral material, a newly-design bi-layered topology, referred to as bi-tetrachiral material, has been theoretically conceived and mechanically modelled. The novel topology virtuously exploits the mutual collaboration between two tetrachiral layers with opposite chiralities. The bi-tetrachiral material has been verified to outperform the tetrachiral material in terms of global Young modulus and, as major achievement, to exhibit a remarkable auxetic behaviour. Specifically, experimental results, confirmed by parametric analytical and computational analyses, have highlighted the effective possibility to attain strongly negative Poisson ratios, identified as a peculiar global elastic property of the novel bi-layered topology.

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Section: Introductionmentioning

confidence: 99%

A novel layered topology of auxetic materials based on the tetrachiral honeycomb microstructure

et al. 2019

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“…This design has increased the energy absorption efficiency and compression resistance. The second is to curl the chiral plate in the axial direction to form a cylinder, such as the novel tetrachiral architected cylindrical tubes [ 39 ]. This design has more obvious axial torsion, bending or expansion and contraction performance.…”

Section: Principles Materials and Methodsmentioning

confidence: 99%

Self-Triggered Thermomechanical Metamaterials with Asymmetric Structures for Programmable Response under Thermal Excitations

et al. 2021

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In this study, we propose self-triggered thermomechanical metamaterials (ST-MM) by applying thermomechanical materials in mechanical metamaterials designed with asymmetric structures (i.e., microstructural hexagons and chiral legs). The thermomechanical metamaterials are observed with programmable mechanical response under thermal excitations, which are used in mechanical metamaterials to obtain chiral tubes with negative Poisson’s ratio and microgrippers with temperature-induced grabbing response. Theoretical and numerical models are developed to analyze the thermomechanical response of the ST-MM from the material and structural perspectives. Finally, we envision advanced applications of the ST-MM as chiral stents and thermoresponsive microgrippers with maximum grabbing force of approximately 101.7 N. The emerging ST-MM provide a promising direction for the design and perception of smart mechanical metamaterials.

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“…Lakes et al first proposed a chiral cellular structure with a hexagonal unit of six bendable ligaments and rotatable central circles [ 32 , 33 ]. Then, tri- and tetra-chiral cellular structures and their variants and combinations were studied by Alderson et al [ 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ]. These studies show that the chiral cellular structures with great compliance are very suitable for applications in precision engineering [ 43 , 44 ] and morphing aircraft engineering [ 45 , 46 ].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of a Chiral Cellular Structure with Semicircular Beams

et al. 2021

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Compliant cellular structures are good candidates for morphing applications. This paper proposes a novel chiral cellular structure composed of circular beams with great elastic properties and potential for morphing. The tensile and shear elastic properties of the structure are studied through theoretical derivations and then verified by finite element analysis. Results show that this novel chiral structure exhibits extremely low in-plane tensile and shear moduli, which are many orders of magnitude lower than that of the raw material. The structure also shows tensile–shear and shear–tensile coupling effects that cannot be ignored. The tensile and shear properties of the structure can provide a reference for employing this structure in engineering applications.

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Compression twist deformation of novel tetrachiral architected cylindrical tube inspired by towel gourd tendrils

Cited by 106 publications

References 22 publications

A novel layered topology of auxetic materials based on the tetrachiral honeycomb microstructure

A novel layered topology of auxetic materials based on the tetrachiral honeycomb microstructure

Self-Triggered Thermomechanical Metamaterials with Asymmetric Structures for Programmable Response under Thermal Excitations

Mechanical Properties of a Chiral Cellular Structure with Semicircular Beams

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