On the fracture statistics of open-porous alumina foam structures

Neumann, Marc; Hubálková, Jana; Voigt, Claudia; Grabenhorst, Joern; Aneziris, Christos G.

doi:10.1016/j.jeurceramsoc.2021.12.034

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…The samples were dried at 120 ℃ and sintered at a temperature of 1300 ℃, and detailed information is seen in Refs. [25,28,31]. In these works, the same type of specimens has already been used for compressive tests, three-point bending tests, and dynamic Young's modulus investigation.…”

Section: Charactristics Of Samplesmentioning

confidence: 99%

“…Therefore, the compressive test is the most applied and assumed to be a standardized method for the ceramic foams. For example, Voigt et al [27] studied the influence of different experimental conditions on compressive strength measurements for the open-cell ceramic foams, and the statistical tools were also established for the validity examination [28].…”

Section: Introduction mentioning

confidence: 99%

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Tensile strength and damage of open-cell ceramic foams under cylindrical splitting test

Dai,

Hubálková,

Voigt

et al. 2023

Journal of Advanced Ceramics

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To widen the understanding of tensile failure of reticulated ceramic foams and expand the available mechanical method, a cylindrical splitting test is developed in the present study based on alumina open-cell foams of three different pore densities. The biaxial method is validated by characterization of mechanical parameters, and the in-situ fracture process is validated by a digital image correlation, followed by a formula correction for effective tensile strength with consideration of discrete crack paths. For experimental setup curved loading platens, compliant pad and intermediate quasi-static loading rate are proposed for guaranteeing tensile failure under a radial compressive load. Tensile strength, fracture energy, and brittleness increase with the foam pore density, and the fracture behavior is a balanced result of materials and foam structural support strength. An analytical model of splitting tensile strength with structural parameters is derived, which implies its dependence on cell size and critical stress intensity factor of strut materials.

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Section: Charactristics Of Samplesmentioning

confidence: 99%

Section: Introduction mentioning

confidence: 99%

Tensile strength and damage of open-cell ceramic foams under cylindrical splitting test

Dai,

Hubálková,

Voigt

et al. 2023

Journal of Advanced Ceramics

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“…The suitability of the Weibull distribution applied to porous ceramics was questioned [38,39]. Comparing four probability distributions, namely the Normal, Log-Normal, Weibull and Gamma to evaluate the crushing strength data of open-cell alumina foams has revealed that all distributions provide a sound representation of the data, since the differences between the goodness of fit (R 2 ) were typically below 0.025 (except for the 30 ppi CS data series) [40].…”

Section: Crushing Strengthmentioning

confidence: 99%

A New Insight into the Role of Silicate-Type Binders on the Crushing Strength of Alumina Foams

et al. 2022

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Semi-closed cell macroporous alumina foams with relative densities ranging from 0.26 to 0.35 have been produced by the well-established replication method based on the coating of a polyurethane (PU) template foam by a ceramic slurry, followed by burnout of the PU template, and sintering of the ceramic skeleton. Collapse of the three-dimensional structure upon the volatilisation of the PU sponge can only be prevented using appropriate binders. Scarce data are available on the slurry formulations of commercial alumina foams. The aim of this study was to investigate the influence of silicate-type binders, namely kaolin and bentonite additives, on the crushing strength of alumina foams. The highest crushing strength of around 10 MPa was observed at a porosity of 66 ± 2%. The open-cell model is inadequate to fit the crushing strength data of such semi-closed cell type structures. Both microscopic and macroscopic flaws resulting from the foam processing method contribute to the wide scatter of the strength, thereby explaining the Weibull modulus ranging from 4 to 7. Both flaw populations require further improvement to maximise the crushing strength of these foams with high potential for the design of structured catalyst carriers and molten aluminium filters.

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Qualitative and Quantitative X-ray Tomography of Filter Macrostructures and Functional Components

Hubálková,

Aneziris

2024

Springer Series in Materials Science

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This chapter focuses on the application of a conventional attenuation based X-ray computed tomography for the investigation of porous and dense structural components in different stages of the manufacturing process and loading. Firstly, the image acquisition process, image processing and qualitative evaluation are introduced using reticulated foam filter and a nozzle component as examples. Secondly, the quantification strategies of the reconstructed volume data involving segmentation of targeted features and its geometrical characterization are presented. Thirdly, the issue of ex-situ investigations is outlined and discussed using differently sized carbon-bonded alumina filters subjected to thermomechanical loading. Fourthly, the interrupted in-situ compression testing of glass foam structures is demonstrated. Finally, the benefits and limitations of conventional X-ray computed tomography as analysis method for porous and dense materials are emphasized.

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On the fracture statistics of open-porous alumina foam structures

Cited by 5 publications

References 18 publications

Tensile strength and damage of open-cell ceramic foams under cylindrical splitting test

Tensile strength and damage of open-cell ceramic foams under cylindrical splitting test

A New Insight into the Role of Silicate-Type Binders on the Crushing Strength of Alumina Foams

Qualitative and Quantitative X-ray Tomography of Filter Macrostructures and Functional Components

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