Prediction of High Temperature Behavior of Open‐Cell Ceramic Foams Using an Experimental‐Numerical Approach

Settgast, Christoph; Solarek, Johannes; Klemm, Yvonne; Abendroth, Martin; Kuna, Meinhard; Biermann, Horst

doi:10.1002/adem.201700082

Cited by 6 publications

(5 citation statements)

References 9 publications

(23 reference statements)

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“…Its mechanical strength and the creeping behavior at high temperatures have already been numerically investigated. [7,8] The considered CFFs were manufactured using the replica technique with dimensions of 50 Â 50 Â 22 mm. Their detailed foam samples, respectively.…”

Section: Filter Geometriesmentioning

confidence: 99%

Influence of Foam Morphology on Effective Properties Related to Metal Melt Filtration

et al. 2017

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In this article, a numerical study on the sensitivity, related to the performance of open-cell foams used for the depth filtration of liquid metals, on two characteristic morphological properties is presented. Therefore, simulations of fluid flow and particle transport inside an artificial foam structure are carried out, whose porosity and strut shape is varied within a certain expected range. For comparison purposes, however, the simulations are also performed for three typical ceramic foam filters (CFF) with pore densities of 20 and 30 PPI, whose geometries are obtained from CT scans. In order to allow for a comparison between the different structures, a reference length is introduced that relies upon the actual ratio of pores per volume. The evaluation is mainly based on the comparison of the hydraulic tortuosity, the viscous and the inertial permeability coefficients as well as the initial filtration coefficient for alumina inclusions, with their size ranging from of 10 to 40 mm at process conditions typically encountered during the aluminum filtration. It is shown that the ratio of filtration coefficient and pressure drop increases with the porosity, while the material distribution between the struts and the joints is less influential. Finally, the article also provides information on the anisotropy of CFFs and on the transition behavior from steady to unsteady flow in open-cell foams.

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Section: Filter Geometriesmentioning

confidence: 99%

Influence of Foam Morphology on Effective Properties Related to Metal Melt Filtration

et al. 2017

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“…To describe the macroscopic behavior a creep law is formulated equivalent to Equation () as

{\overset{E}{true}}_{cr} = \frac{Σ_{eq}}{A (ρ_{rel})} \cdot t^{m} .

It is assumed in accordance with [ 27 ] that the time exponent m of the macro‐ and microscopic creep law are equal and the parameter A is a function of the relative density. For A an ansatz of the “Gibson–Ashby”‐law is being made as shown in Equation () which is equivalent to Equation ().

\frac{A (ρ_{rel})}{a} = c_{1} \cdot ρ_{rel}^{c_{2}}

Creep tests are simulated by setting a constant (macroscopic) load in one direction and unhindered expansion in the other directions.…”

Section: Resultsmentioning

confidence: 99%

“…An investigation at a temperature of

Θ \approx 1350 ° C

revealed a stress exponent

n = 1.06 \approx 1

. [ 27 ] In addition, many ceramics have a stress exponent in the range between 3 and 5. [ 31 ] In this study, only ceramics with

n \approx 1

are regarded.…”

Section: Theorymentioning

confidence: 99%

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Influence of the Foam Morphology on the Mechanical Behavior of Flow‐Through Foam Filters During Filtration Processes

et al. 2021

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Artificial foam structures are used in all kinds of applications, for example, in filters, where non‐metallic inclusions are filtered out of the molten metal. The flow‐through of the fluid leads to a mechanical loading, which is influenced by the flow velocity, the viscosity of the fluid, the foam morphology, and the shape of the filter. Analytical and numerical approaches are being used to study the influence of different parameters on the mechanical response and the impact on local stresses at the foam struts. Finite element models of the foams are used to evaluate the homogenized stiffness tensor and to determine maximal local stresses in dependence of the macroscopic strain. On the macroscopic filter scale, an orthotropic Mindlin plate model is deployed. The results are compared with a FE2‐simulation.

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“…[1][2][3][4][5] One important aim of using state-of-the-art methods of computational mechanics in this context is the theoretical and numerical assessment of the effective properties of such foam-based, or foam-like, structures, for example, in terms of their strength, [6,7] thermal shock resistance, or high-temperature creep behavior under technologically realistic loading conditions. [8] Such a simulation-based approach also has validity as multiscale experimental investigations of foam structures are often difficult and costly, especially under multiaxial loading. A second, even more far-reaching aspect, is then the endeavor to tailor these filter properties by means of a virtual foam design methodology that incorporates multiscale solid, fluid, and thermal analyses predicting the resulting effective behavior.…”

Section: Introductionmentioning

confidence: 99%

A Hybrid Approach Employing Neural Networks to Simulate the Elasto−Plastic Deformation Behavior of 3D‐Foam Structures

et al. 2021

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Prediction of High Temperature Behavior of Open‐Cell Ceramic Foams Using an Experimental‐Numerical Approach

Cited by 6 publications

References 9 publications

Influence of Foam Morphology on Effective Properties Related to Metal Melt Filtration

Influence of Foam Morphology on Effective Properties Related to Metal Melt Filtration

Influence of the Foam Morphology on the Mechanical Behavior of Flow‐Through Foam Filters During Filtration Processes

A Hybrid Approach Employing Neural Networks to Simulate the Elasto−Plastic Deformation Behavior of 3D‐Foam Structures

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