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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.
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.
The author Yajie Dai acknowledges the fellowship provided by the Alexander von Humboldt Foundation. The support from the National Natural Science Foundation of China (Nos. U21A2058 and U22A20127) and the German Research Foundation (Collaborative Research Center 920, Multi-Functional Filters for Metal Melt Filtration—A Contribution toward Zero Defect Materials) are appreciated. The author Claudia Voigt would like to thank the Federal Ministry of Education and Research (BMBF) for supporting these investigations as part of the junior research group PurCo (No. 03XP0420). The authors also would like to acknowledge the support of Enrico Storti, Jacqueline Hohne, and Undine Fischer. Finally, we would like to thank Drache GmbH, Germany, for their support.
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