Statistical Analysis of the Local Strut Thickness of Open Cell Foams

Liebscher, André; Redenbach, Claudia

doi:10.5566/ias.v32.p1-12

Cited by 27 publications

(7 citation statements)

References 48 publications

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“…However, a typical feature of open foams, which is often overlooked, is the fact that the strut thickness varies locally. Normally, the branches become thicker at the ends than at their centers [29]. Moreover, experiments show that the ligament shape is related to the void fraction of the foam [28].…”

Section: Methodsmentioning

confidence: 99%

Advanced Laguerre Tessellation for the Reconstruction of Ceramic Foams and Prediction of Transport Properties

2019

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Ceramic foams are promising, highly porous materials, with a wide range of specific surface area and low fluid flow resistance, which are well-suited for filtering applications. They are comprised mainly of macrovoids that are interconnected with struts. A branch-shaped reconstruction algorithm is introduced in the present work to reconstruct various ceramic foams from electron microscopy images using the Laguerre tessellation method. Subsequently, the reconstructed samples are used for the numerical calculation of pore structure and transport properties, including specific surface area, tortuosity, effective diffusivity, and flow permeability. Following comparison with experimental data, this reconstruction method is shown to be more reliable than typical analytical expressions that are suggested in the literature for the aforementioned structural and transport properties. Extracting the equivalent pore radius of the reconstructed domains offers improved accuracy of the analytical expressions for the permeability estimation.

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Section: Methodsmentioning

confidence: 99%

Advanced Laguerre Tessellation for the Reconstruction of Ceramic Foams and Prediction of Transport Properties

2019

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“…In this case, it is interesting to characterize the solid component of the foam formed by an interconnected network of struts, by evaluating the strut length, strut thickness and their connectivity. These parameters are known to have impact on mechanical and thermal properties of the foam [11].…”

Section: Methodsmentioning

confidence: 99%

Structural analysis of advanced polymeric foams by means of high resolution X-ray computed tomography

Nacucchi

Pascalis

Scatto

et al. 2016

AIP Conference Proceedings

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Abstract. Advanced polymeric foams with enhanced thermal insulation and mechanical properties are used in a wide range of industrial applications. The properties of a foam strongly depend upon its cell structure. Traditionally, their microstructure has been studied using 2D imaging systems based on optical or electron microscopy, with the obvious disadvantage that only the surface of the sample can be analysed. To overcome this shortcoming, the adoption of X-ray micro-tomography imaging is here suggested to allow for a complete 3D, non-destructive analysis of advanced polymeric foams. Unlike metallic foams, the resolution of the reconstructed structural features is hampered by the low contrast in the images due to weak X-ray absorption in the polymer. In this work an advanced methodology based on high-resolution and low-contrast techniques is used to perform quantitative analyses on both closed and open cells foams. Local structural features of individual cells such as equivalent diameter, sphericity, anisotropy and orientation are statistically evaluated. In addition, thickness and length of the struts are determined, underlining the key role played by the achieved resolution. In perspective, the quantitative description of these structural features will be used to evaluate the results of in situ mechanical and thermal test on foam samples.

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“…Here, the strut thickness is modeled as a polynomial of the distance x from the strut center to the adjacent nodes. In [24] it turned out that a polynomial of the form…”

Section: Microstructure Generationmentioning

confidence: 99%

“…Locally variable strut thickness was considered by [21,24]. Here, the strut thickness is modeled as a polynomial of the distance x from the strut center to the adjacent nodes.…”

Section: Microstructure Generationmentioning

confidence: 99%