Smart shape memory alloy chiral honeycomb

Hassan, Mohd Roshdi; Scarpa, Fabrizio; Ruzzene, Massimo; Mohammed, NA

doi:10.1016/j.msea.2006.10.219

Cited by 97 publications

(58 citation statements)

References 10 publications

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“…NPR honeycomb structures feature synclastic curvature behavior, therefore making possible to provide dome-shaped surfaces when loaded with out-of-plane bending deformation [30,32]. Auxetic honeycombs have been employed to prototype radomes [33], adaptive and deployable structures [34], and morphing wings [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

In-plane elasticity of a novel auxetic honeycomb design

Huang

Zhang

Scarpa

et al. 2017

Composites Part B: Engineering

128

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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

128

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“…Upon release of the mechanical load, the heating of the de-twinned martensite crystal above the austenite finish temperature can lead to a reverse phase change transformation, and to the recovery of the original unstressed shape [2]. Recently, cellular solids with shape memory alloys have been manufactured in honeycomb topologies [3,4], using also negative Poisson's ratio configurations [4,5]. Foams and microporous materials have been also manufactured in the nickel-titanium phase [6,7].…”

Section: Introductionmentioning

confidence: 99%

Shape memory behaviour in auxetic foams: Mechanical properties

2010

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“…The weight calculations used for the carpet plots of Fig. 2 feature both hexachiral and tetrachiral structures the same constant node thickness of 7.5mm, ligament thickness of 0.25mm and ligament width of 7mm, as used in a previous prototype [11]. It is clear from Fig.2 that tetrachiral honeycombs present lower and hence better weight to area ratios for a same node radius and ligament length than the hexachiral honeycomb.…”

Section: Manufacturing and Developmentmentioning

confidence: 91%

Auxetic shape memory alloy cellular structures for deployable satellite antennas: design, manufacture and testing

Scarpa

Jacobs

Coconnier

et al. 2010

EPJ Web of Conferences

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Abstract. We describe the production development and experimental tests related to an hybrid honeycomb-truss made of shape memory alloy (Ni48Ti46Cu6), and used as a demonstrator for a deployable antenna in deep-space missions. Specific emphasis is placed on the modal analysis techniques used to test the lightweight SMA structure.. Background on SMA cellular structuresShape memory alloy (SMA) can be considered amongst the most successful smart materials to date in terms of spread of applications, and relative maturity of the technology. We do not aim in this work to provide an extensive review on the SMA field, however the interested reader can look for reference [1] for a detailed introduction on the subject. However, SMA honeycombs constitute a more recent development, being proposed by some of the Authors for the first time in 2004 at the SPIE Smart Materials and Structure Conference in San Diego, CA. Hassan, Scarpa and Mohammed [2] developed a OX (overexpanded) hexagonal honeycomb cold moulding some 1-way SMA ribbons, and gluing the hexagonal shapes obtained with a high temperature epoxy-based polymer. Almost at the same time, Shaw et al at the University of Michigan developed a patented assembling technique based on welding niobium rods, which allows producing small cellular samples with high manufacturing fidelity (i.e., low dimensional and precision tolerances) [3]. Prototypes of SMA honeycombs made with a similar welding techniques have been also manufactured and sandwich within composite face skins at the University of Tokyo. The sandwich panels subjected to low kinetic energy impacts and subsequent heating from martensite to austenite phase showed one of the main features for which SMA cellular structures have been developed -the capability of absorbing energy, and restoring (in a significant percentage) the original shape after impact [4]. Another interesting feature of SMA based honeycombs is also their intrinsic high hysteretic damping, 2-3 orders of magnitude higher than the commercial aluminium or steel-based honeycombs used in high end aerospace applications subjected to high cyclic fatigue loading or broadband vibration input [5].The cellular structures considered so far have a centresymmetric topology -I.e., two perpendicular axis of symmetry. However, it is possible also to adopt a rotational-type of symmetry, which provides a combined in-plane rotation and translational deformation when subjected to inplane uniaxial loading, and feature also a negative Poisson's ratio behaviour. This structure, called hexagonal chiral topology, has been proposed as load-bearing concept by Prall and Lakes in 1996 [6], although the idea of negative Poisson's ratio in chiral-related structures was first devised by Wojciechowski for molecular assemblies [7]. The Poisson's ratio of this cellular structure is close to

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Smart shape memory alloy chiral honeycomb

Cited by 97 publications

References 10 publications

In-plane elasticity of a novel auxetic honeycomb design

In-plane elasticity of a novel auxetic honeycomb design

Shape memory behaviour in auxetic foams: Mechanical properties

Auxetic shape memory alloy cellular structures for deployable satellite antennas: design, manufacture and testing

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