Transverse stiffness and strength of Kirigami zero-ν PEEK honeycombs

Neville, Robin; Monti, Alessio; Hazra, K; Scarpa, Fabrizio; Remillat, Chrystel D L; Farrow, Ian R

doi:10.1016/j.compstruct.2014.04.001

Cited by 46 publications

(30 citation statements)

References 38 publications

(44 reference statements)

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“…Different honeycomb configurations result in different values of the in-plane Poisson's ratio. A variety of honeycomb configurations achieving positive/negative/zero Poisson's ratio have been proposed and investigated with special focus on the in-plane mechanics, flatwise compressive strength and the transverse shear modulus [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Honeycombs with negative Poisson's ratio (NPR) can likewise be described as auxetic [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

In-plane elasticity of a novel auxetic honeycomb design

Huang

Zhang

Scarpa

et al. 2017

Composites Part B: Engineering

123

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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. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms Abstract: This work presents a novel negative Poisson's ratio honeycomb design composed by two parts (a re-entrant hexagonal component and a thin plate part) that provide separate contributions to the in-plane and out-of-plane mechanical properties. The re-entrant hexagons provide the in-plane negative Poisson's ratio, the in-plane compliance and the out-of-plane compressive strength, while the thin plate part connecting the re-entrant hexagonal section bears the large out-of-plane flexibility. This paper focuses on the in-plane mechanical properties of the auxetic cellular structure. Theoretical models related to the in-plane uniaxial tensile modulus, the shear modulus, and the Poisson's ratios have been built and validated using the finite element techniques. The in-plane behavior of the honeycomb has also been investigated against the geometrical parameters of the unit cell using a parametrical analysis. The theoretical and numerical models illustrate good agreement and show the potential of its application in morphing structures. We also provide a benchmark of the auxetic configuration proposed in this work against negative Poisson's ratio topologies from open literature.

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Section: Introductionmentioning

confidence: 99%

In-plane elasticity of a novel auxetic honeycomb design

Huang

Zhang

Scarpa

et al. 2017

Composites Part B: Engineering

123

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“…A comparison between the mechanical results and the predicted values calculated through the analytical model has been performed and benchmarked against the specific properties of commercially available cores as well as with the ZPR Silicomb [29,30,32]. The ultimate force for the analytical model has been calculated knowing the theoretical surface area that a manufactured sample should have.…”

Section: Resultsmentioning

confidence: 99%

“…PEEK is well known for its high chemical resistance; this makes it a very difficult plastic to join on itself. Cyanoacrylate as well as epoxy adhesives have been previously tested [29,30], but the best option in our case consisted in join-melting where needed. By using a traditional gas soldering station the folded parts that were supposed to be glued to close the cells were molten and joined together (Fig.…”

Section: Manufacturing and Test Methodsmentioning

confidence: 99%

AUXHEX – A Kirigami inspired zero Poisson’s ratio cellular structure

Broccolo

Laurenzi

Scarpa

2017

Composite Structures

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“…No lateral coupling behavior can be observed when ZPR honeycombs are loaded uniaxially under in-plane deformations [16]. In the case of out-of-plane loading, honeycombs with ZPR behavior exhibit no synclastic or anticlastic curvatures, rather cylindrical ones [22]. These features (absence of transverse in-plane deformation and cylindrical bending) make ZPR cellular structures an interesting material platform for one-dimensional morphing, the build-up of cylindrical sandwich panels, or morphing structures that undergo cylindrical bending deformations [18,22].…”

Section: Introductionmentioning

confidence: 99%

“…In the case of out-of-plane loading, honeycombs with ZPR behavior exhibit no synclastic or anticlastic curvatures, rather cylindrical ones [22]. These features (absence of transverse in-plane deformation and cylindrical bending) make ZPR cellular structures an interesting material platform for one-dimensional morphing, the build-up of cylindrical sandwich panels, or morphing structures that undergo cylindrical bending deformations [18,22]. Honeycomb structures with ZPR property have been also used in biomedical scaffolds [23] and one-dimensional spanwise morphing flexible skins [2,3,21].…”

Section: Introductionmentioning

confidence: 99%

Shape memory polymer-based hybrid honeycomb structures with zero Poisson’s ratio and variable stiffness

Huang

Zhang

Scarpa

et al. 2017

Composite Structures

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University of Bristol -Explore Bristol Research General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms Abstract: This work describes the out-of-plane bending performance, shape memory effect and variable stiffness of a zero Poisson's ratio honeycomb structure made from the tessellation of re-entrant hexagons and thin plates. The re-entrant hexagons are fabricated with ABS plastics and the thin plates are made from thermosetting styrene-based shape memory polymers (SMPs). The hexagons and the SMP plates are bonded within the groove joints in the thickness direction of the re-entrant cell units. The re-entrant hexagons generate out-of-plane flatwise compressive stiffness and in-plane compliance, while the SMPs thin plates support out-of-plane flexibility, the shape memory effect and a variable bending stiffness. Because the ABS plastics possesses a significantly higher glass transition temperature than the SMPs, the ZPR honeycomb structure features a higher out-of-plane flexibility when the environmental temperature rises from room temperature to the glass transition temperature of the SMPs. On the contrary, the flatwise compressive stiffness of the ZPR honeycomb remains unchanged. Three-point bending tests have also been performed to determine the out-of-plane bending performance of the ZPR structures at varying temperatures.

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Transverse stiffness and strength of Kirigami zero-ν PEEK honeycombs

Cited by 46 publications

References 38 publications

In-plane elasticity of a novel auxetic honeycomb design

In-plane elasticity of a novel auxetic honeycomb design

AUXHEX – A Kirigami inspired zero Poisson’s ratio cellular structure

Shape memory polymer-based hybrid honeycomb structures with zero Poisson’s ratio and variable stiffness

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