Simple cubic three-dimensional auxetic metamaterials

Shen, Jianhu; Zhou, Shiwei; Huang, Xiaodong; Xie, Yi Min

doi:10.1002/pssb.201451304

Cited by 123 publications

(104 citation statements)

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“…which forms the basis of the PolyJet flexible material range has a Young's modulus of less than 1Mpa [10] and tensile strength of 1.2Mpa [5] and therefore is extremely limited in its usefulness in energy absorbing applications; in work by Shen et al [10], auxetic lattices were created which failed during the extraction of the part from the surrounding support structure.…”

Section: D) C)mentioning

confidence: 99%

3D printed polyurethane honeycombs for repeated tailored energy absorption

Bates¹,

2016

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. AbstractFused filament fabrication (FFF) 3D printing of thermoplastic polyurethanes (TPUs) offers a unique capability to manufacture tailorable, flexible cellular structures which can be designed and optimised for specific energy absorbing applications. This paper describes the first application of this methodology in the creation and experimental analysis of 3D printed cellular structures, which are capable of undergoing repeated compressions to densification without failure. A parametric study has been undertaken, capturing the energy absorbing capability of hexagonal arrays manufactured from two types of TPU, with relative densities 0.18-0.49. Arrays were subject to compressions at strain rates 0.03-0.3s -1 and were capable of absorbing energies over the range of 0.01-0.34J/cm 3 , before recovering elastically. Critically, samples attained a maximum energy absorbing 'efficiency' of 0.36, which is comparable to that of traditional expanded closed cell polyurethane foams. The energy absorption behaviour of all structures was found to be dependent on strain rate and cell orientation with respect to the compression direction. This study shows the clear potential of FFF 3D printing for the creation of a new breed of cellular architectures, which are not constrained by existing manufacturing principles, offering the designer the capability to create resilient architectures specifically tailored to operational applications and environmental conditions. Keywords: Cellular structures, thermoplastic polyurethane, 3D printing, energy absorption Introduction:

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Section: D) C)mentioning

confidence: 99%

3D printed polyurethane honeycombs for repeated tailored energy absorption

Bates¹,

2016

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“…Inspired by this, man-made hierarchical materials have been extensively developed in the past decades3456789. More recently, there has been increasing interest in creating materials whose mechanical properties are largely determined by their cellular architecture rather than their chemical composition, i.e., the so-called metamaterials101112131415161718192021. Furthermore, metamaterials that are hierarchically constructed have been reported to exhibit exceptional mechanical properties such as high strength, enhanced toughness and reversible extensibility6922232425262728.…”

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“…Furthermore, metamaterials that are hierarchically constructed have been reported to exhibit exceptional mechanical properties such as high strength, enhanced toughness and reversible extensibility6922232425262728. Among the metamaterials, auxetic materials, which exhibit negative Poisson’s ratio (NPR), have been studied extensively61011282930. To design auxetic metamaterials with tuneable mechanical properties, the mechanism of “rotating rigid units” is one of the most frequently used principles8910111228.…”

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Design of Hierarchical Structures for Synchronized Deformations

Seifi

Javan

Ghaedizadeh

et al. 2017

Sci Rep

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In this paper we propose a general method for creating a new type of hierarchical structures at any level in both 2D and 3D. A simple rule based on a rotate-and-mirror procedure is introduced to achieve multi-level hierarchies. These new hierarchical structures have remarkably few degrees of freedom compared to existing designs by other methods. More importantly, these structures exhibit synchronized motions during opening or closure, resulting in uniform and easily-controllable deformations. Furthermore, a simple analytical formula is found which can be used to avoid collision of units of the structure during the closing process. The novel design concept is verified by mathematical analyses, computational simulations and physical experiments.

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“…Although there have been a number of attempts to create 3D printed cellular structures with tailorable stress-strain and energy absorbing behaviour [5][6][7], much of the work has focused on the printing of brittle structures and attempts to create structures with hyperelastic behaviour via polyjet 3D printing produced samples fragile in nature which fractured during the removal of support material [8]. In order to create hyperelastic, durable structures, fused filament fabrication (FFF) 3D printing is used as it allows the use of thermoplastic polyurethane (TPU), a material known to have excellent impact properties and abrasion resistance [9].…”

Section: Introductionmentioning

confidence: 99%