Vibro-Acoustic Properties of Auxetic Open Cell Foam: Model and Experimental Results

Chekkal, I.; Bianchi, Matteo; Remillat, Chrystel D L; Bécot, François‐Xavier; Jaouen, Luc; Scarpa, Fabrizio

doi:10.3813/aaa.918276

Cited by 44 publications

(20 citation statements)

References 26 publications

(35 reference statements)

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“…11.0 commercial FE analysis package has been used [32]. The application of unit cell homogenization in the calculation of the vibroacoustic behavior of auxetic structures has been already proposed by Chekkal et al [33]. The homogenization of the sandwich plate is performed by using shell elements to represent the skins, while the homogenized core of the anti-tetrachiral cells is represented by two solid element per gauge thickness, with their properties defined by the compliance matrix [S] (Fig.…”

Section: Homogenization Of Fe Model For Auxetic Sandwich Panelmentioning

confidence: 99%

Vibroacoustic optimization of anti-tetrachiral and auxetic hexagonal sandwich panels with gradient geometry

Ranjbar¹,

Boldrin²,

Scarpa³

et al. 2016

Smart Mater. Struct.

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The work describes the vibroacoustic behavior of anti-tetrachiral and auxetic hexagonal gradient sandwich panels using homogenized finite element models to determine the mechanical properties of the auxetic structures, the natural frequencies and radiated sound power level of sandwich panels made by the auxetic cores. The mechanical properties and the vibroacoustic behavior of auxetic hexagonal sandwich panels are investigated as a benchmark. The radiated sound power level of the structure over the frequency range of 0 to 1000 Hz is minimized by modifying the core geometry of the gradient auxetic sandwich panels. Several excitation cases are considered. First-order and random optimization methods are used for the minimization of radiated sound power level of the structures. The results of this study present significant insights into the design of auxetic structures with respect to their vibroacoustical properties.

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Section: Homogenization Of Fe Model For Auxetic Sandwich Panelmentioning

confidence: 99%

Vibroacoustic optimization of anti-tetrachiral and auxetic hexagonal sandwich panels with gradient geometry

Ranjbar¹,

Boldrin²,

Scarpa³

et al. 2016

Smart Mater. Struct.

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“…In 1987, Lakes 4 presented the first sample of auxetic foams made from commercially available open cell thermoplastic foam (Scott Inc., USA) showing a Poisson's ratio of −0.7. The paper by Lakes initiated a new field of research in modelling, manufacturing and testing of auxetic materials and structures 5–7 for potential engineering application in structural integrity 8, sandwich components 9, sound management 10–12 and passive smart structural devices 13. Polymeric and metal foams have been converted into the auxetic state 7, 14 showing enhancement in terms of indentability 15, 16, sound absorption coefficients 8 and viscoelastic loss 17, 18 compared to their conventional versions.…”

Section: Introductionmentioning

confidence: 99%

Density change during the manufacturing process of PU–PE open cell auxetic foams

Bianchi

Frontoni

Scarpa

et al. 2010

Physica Status Solidi (b)

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This paper describes a modified manufacturing route involving a large change in density in auxetic negative Poisson's ratio (NPR) foams. Density change of auxetic foams after manufacturing is a common feature for this porous material. Samples of open cell PU-PE (i.e. the combination of polyurethane-polyethylene) foams with NPR are produced from two similar native materials using both the classical and the novel custom manufacturing methods. In the classical manufacturing route the cooling process is typically carried out with the foam in a confined state. Conversely, in the new manufacturing process it was substituted with a release process. Samples were subjected to both tensile and compressive loading, as well as density measurements. A thorough mechanical characterisation of the foams is described, linking the mechanical properties with their change in density after conversion into auxetic.

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“…This new class of materials has been drawing more and more attention since then [2,7,23,37,55,56,58,68,80,100,113,119,122,125,144,155,169,178,193,194,212], as well as their potential applications [15,28,46,67,135]. Auxetic materials have also been expected to present enhanced acoustic damping [131]; this was shown experimentally in [43,44]. The use of auxetics as building blocks for wave-guiding metamaterials has also been investigated in [13,198].…”

Section: Auxeticsmentioning

confidence: 99%

Computational Homogenization of Architectured Materials

Dirrenberger

Forest

Jeulin

2019

Architectured Materials in Nature and Engineering

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Architectured materials involve geometrically engineered distributions of microstructural phases at a scale comparable to the scale of the component, thus calling for new models in order to determine the effective properties of materials. The present chapter aims at providing such models, in the case of mechanical properties. As a matter of fact, one engineering challenge is to predict the effective properties of such materials; computational homogenization using finite element analysis is a powerful tool to do so. Homogenized behavior of architectured materials can thus be used in large structural computations, hence enabling the dissemination of architectured materials in the industry. Furthermore, computational homogenization is the basis for computational topology optimization which will give rise to the next generation of architectured materials. This chapter covers the computational homogenization of periodic architectured materials in elasticity and plasticity, as well as the homogenization and representativity of random architectured materials.

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Vibro-Acoustic Properties of Auxetic Open Cell Foam: Model and Experimental Results

Cited by 44 publications

References 26 publications

Vibroacoustic optimization of anti-tetrachiral and auxetic hexagonal sandwich panels with gradient geometry

Vibroacoustic optimization of anti-tetrachiral and auxetic hexagonal sandwich panels with gradient geometry

Density change during the manufacturing process of PU–PE open cell auxetic foams

Computational Homogenization of Architectured Materials

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