In situ three-dimensional X-ray microtomography of an auxetic foam under tension

McDonald, S.A.; Ravirala, N.; Withers, Philip J.; Alderson, Andrew

doi:10.1016/j.scriptamat.2008.10.013

Cited by 62 publications

(66 citation statements)

References 17 publications

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“…In particular, it should be noted that recent studies relating to the micro-structural features of auxetic open-cell foams have shown that rib hinging is one of the mechanisms that leads to auxetic behaviour in these foams (McDonald et al 2009) and it is a known fact that most foams exhibit near-zero Poisson's ratios under high compressive strains, a property that is representable by this model. Obviously, in such real systems it may be unrealistic to assume that the real material would behave in the highly idealized manner presented here, i.e.…”

Section: Resultsmentioning

confidence: 85%

Three-dimensional cellular structures with negative Poisson's ratio and negative compressibility properties

et al. 2012

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A three-dimensional cellular system that may be made to exhibit some very unusual but highly useful mechanical properties, including negative Poisson's ratio (auxetic), zero Poisson's ratio, negative linear and negative area compressibility, is proposed and discussed. It is shown that such behaviour is scale-independent and may be obtained from particular conformations of this highly versatile system. This model may be used to explain the auxetic behaviour in auxetic foams and in other related cellular systems; such materials are widely known for their superior performance in various practical applications. It may also be used as a blueprint for the design and manufacture of new man-made multifunctional systems, including auxetic and negative compressibility systems, which can be made to have tailor-made mechanical properties.

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Section: Resultsmentioning

confidence: 85%

Three-dimensional cellular structures with negative Poisson's ratio and negative compressibility properties

et al. 2012

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“…Most of the research focuses on the mechanical/deformation behaviour but other properties are also considered. Amongst the recent studies, some are dedicated to cellular materials in general, 362,[376][377][378][379][380] others focus on specific types of cellular materials including metals, 372,[381][382][383][384][385][386][387][388][389][390] ceramics, 257,[391][392][393][394] polymers, [395][396][397] carbon, 398 nuclear graphite 399 and even bread. 400 In some cases FE simulations have been run side by side with in situ deformation under CT observation to compare their predictive capability both locally on a strut-by-strut basis and globally in terms of Poisson's ratio and Young's modulus, for example for conventional versus auxetic open cell foams.…”

Section: Image Based Modelling Of Cellular/porous Materialsmentioning

confidence: 99%

Quantitative X-ray tomography

Maire¹,

Withers²

2013

International Materials Reviews

1,086

601

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X-ray computer tomography (CT) is fast becoming an accepted tool within the materials science community for the acquisition of 3D images. Here the authors review the current state of the art as CT transforms from a qualitative diagnostic tool to a quantitative one. Our review considers first the image acquisition process, including the use of iterative reconstruction strategies suited to specific segmentation tasks and emerging methods that provide more insight (e.g. fast and high resolution imaging, crystallite (grain) imaging) than conventional attenuation based tomography. Methods and shortcomings of CT are examined for the quantification of 3D volumetric data to extract key topological parameters such as phase fractions, phase contiguity, and damage levels as well as density variations. As a non-destructive technique, CT is an ideal means of following structural development over time via time lapse sequences of 3D images (sometimes called 3D movies or 4D imaging). This includes information needed to optimise manufacturing processes, for example sintering or solidification, or to highlight the proclivity of specific degradation processes under service conditions, such as intergranular corrosion or fatigue crack growth. Besides the repeated application of static 3D image quantification to track such changes, digital volume correlation (DVC) and particle tracking (PT) methods are enabling the mapping of deformation in 3D over time. Finally the use of CT images is considered as the starting point for numerical modelling based on realistic microstructures, for example to predict flow through porous materials, the crystalline deformation of polycrystalline aggregates or the mechanical properties of composite materials.

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“…Similarly to previous studies where optical methods have been used to characterize the deformation in auxetic foams [34][35][36][37], here the displacements within the samples are captured in detail using Digital Image Correlation (DIC). DIC is a technique by which displacements can be measured by correlating (via software) the pixels in several digital images taken at different applied loads [38].…”

Section: Reserved For Publication Footnotesmentioning

confidence: 99%

Low Porosity Metallic Periodic Structures with Negative Poisson's Ratio

et al. 2013

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Auxetic behavior in low porosity metallic structures is demonstrated via a simple system of orthogonal elliptical voids. In this minimal 2D system, the Poisson's ratio can be effectively controlled by changing the aspect ratio of the voids. In this way, large negative values of Poisson's ratio can be achieved, indicating an effective strategy for designing auxetic structures with desired porosity.

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In situ three-dimensional X-ray microtomography of an auxetic foam under tension

Cited by 62 publications

References 17 publications

Three-dimensional cellular structures with negative Poisson's ratio and negative compressibility properties

Three-dimensional cellular structures with negative Poisson's ratio and negative compressibility properties

Quantitative X-ray tomography

Low Porosity Metallic Periodic Structures with Negative Poisson's Ratio

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