Conductive properties of foam materials with open or closed cells

Kanaun, S. K.; Kochekseraii, Sadegh Babaii

doi:10.1016/j.ijengsci.2011.08.010

Cited by 10 publications

(4 citation statements)

References 14 publications

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“…The full randomness in the microstructural features is not taken into account, and the individual contribution/importance of each geometrical features can not then be singled out. Tessellation-based models include Voronoi tessellations (Zhu et al, 2014;Roberts and Garboczi, 2001;Song et al, 2010;Tekoglu et al, 2011;Kanaun and Kochekseraii, 2012) and Laguerre tessellations (Redenbach, 2009;Chen et al, 2015;Redenbach et al, 2012). Various microstructure generation algorithms are available to construct Voronoi/Laguerre tessellation based RVEs such as Random Sequential Addition (RSA) algorithm and Random Close Packing (RCP) algorithm.…”

Section: Introductionmentioning

confidence: 99%

Multiscale computational modelling of closed cell metallic foams with detailed microstructural morphological control

Ghazi

Berke

Kamel

et al. 2019

International Journal of Engineering Science

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This contribution addresses the multiscale computational modelling of closed cell metallic foams by means of an integrated RVE (Representative Volume Element) generation and computation strategy. The microstructural geometry is computationally generated by controlling relevant fine scale features such as the distribution of cell sizes, the spatial organization of cell sizes and cell wall thicknesses and curvatures. The number of faces per cell and edges per face are also set to comply with the experimentally observed values. The computational generation of the RVE is built on three ingredients: (i) a random close inclusions packing algorithm based on random sequential addition assisted by neighbour distance control, (ii) a distance field-based shape tessellation (morphing) that allows reproducing cell wall curvatures and varying cell wall thicknesses from the inclusions packing, (iii) a close control of the shape of the cells. The RVE geometry is thus described using implicit functions, thereby allowing a seamless transition towards a recently developed mesh generation technique for heterogeneous microstructures represented by such implicit functions, enabling simulations in standard softwares. This controlled generation methodology is illustrated based on experimental data available in literature for morphological indicators relevant to the foam mechanical behaviour. A qualitative and quantitative agreement between FE results and experimental data is obtained for the mechanical response of a commercially available ALPORAS foam. The individual contribution of each microstructural feature (size distributions, wall thickness and curvatures) to the average behaviour of closed cell foams is assessed through FE computations on increasingly complex geometries.

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Section: Introductionmentioning

confidence: 99%

Multiscale computational modelling of closed cell metallic foams with detailed microstructural morphological control

Ghazi

Berke

Kamel

et al. 2019

International Journal of Engineering Science

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“…However, many researchers remained interested and metallic foams and casting systems are still research interests today [13][14][15][16][17][18][19][20][21]. Aluminum metal foam production is divided into two types: open cell and closed cell [6,7]. Production systems affect the aluminum metal foam's grain size, pore or cell size and shape, amount of pores, and shell thickness [7,11,22].…”

Section: Aluminum Integral Foam Castingmentioning

confidence: 99%

“…They are divided into two groups according to their structure [6,7]: open cell and closed cell. Different applications of metal integral foam have led to the development of various production methods.…”

Section: Introductionmentioning

confidence: 99%

New Approaches to Aluminum Integral Foam Production with Casting Methods

Güner

Arikan

Nebioğlu

2015

Metals

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Abstract:Integral foam has been used in the production of polymer materials for a long time. Metal integral foam casting systems are obtained by transferring and adapting polymer injection technology. Metal integral foam produced by casting has a solid skin at the surface and a foam core. Producing near-net shape reduces production expenses. Insurance companies nowadays want the automotive industry to use metallic foam parts because of their higher impact energy absorption properties. In this paper, manufacturing processes of aluminum integral foam with casting methods will be discussed.

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“…However, it also suffers from some disadvantages, like its low tear strength, relatively high density and an obvious viscoelasticity. Foaming is a method to overcome these disadvantages . The flexibility can be significantly improved by the foaming procedure.…”

Section: Introductionmentioning

confidence: 99%

Piezoresistivities of vapor‐grown carbon fiber/silicone foams for tactile sensor applications

Guo

Kondo²,

Takai

et al. 2016

Polymer International

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Due to the growing demand for tactile sensors, the possibility of detecting an external uniaxial pressure by the piezoresistive measuring of a conductive filler/elastomer composite was investigated. A series of piezoresistive models are discussed. Novel highly sensitive piezoresistive foams with excellent elasticity were fabricated using vapor-grown carbon fiber (VGCF), two-component silicone elastomer and a new type of thermally expandable micro beads foaming agent to overcome the disadvantages of the silicone elastomer in the utilization of a tactile sensor. Deformations of the foams caused by uniaxial pressure were observed using scanning electron microscopy from cross-sections. Effects of the VGCF and the foaming agent on the piezoresistivitiy were investigated. The piezoresistive mechanisms of the foams are discussed according to the measurements, and good fit was found between the theoretical calculations and the experimental piezoresistivity measurements. It is found that the addition of the micro beads foaming agent can improve the piezoresistivity of the VGCF/silicone foam and increase the sensitivity and repeatability for its application in a tactile sensor.

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Conductive properties of foam materials with open or closed cells

Cited by 10 publications

References 14 publications

Multiscale computational modelling of closed cell metallic foams with detailed microstructural morphological control

Multiscale computational modelling of closed cell metallic foams with detailed microstructural morphological control

New Approaches to Aluminum Integral Foam Production with Casting Methods

Piezoresistivities of vapor‐grown carbon fiber/silicone foams for tactile sensor applications

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