Utilization of a Miniaturized Brazilian Disc Test for Strength Measurements of C‐Bonded Alumina Filter Materials

• Published in: Advanced engineering materials 2022-02, Vol.24 (2), p.n/a
• Main Authors: Takht Firouzeh, Shahin, Abendroth, Martin, Fischer, Undine, Aneziris, Christos G., Kiefer, Björn
• Format: Article
• Language: English
• Subjects: Brazilian disc test; filter materials; finite element method; material behavior; parameter identification
• ISSN: 1438-1656; 1527-2648
• DOI: 10.1002/adem.202101081

Filtration of molten metals using open cell ceramic filters has proven the premises regarding the improvements of the final product quality. The Collaborative Research Center 920 has made a substantive record in developing carbon‐bonded alumina (C−Al2O3) filters. Considering the mechanical loads carried by these filters, material strength determination is a necessary step to improve their performance. The Brazilian disc test (BDT) is a method to determine mechanical properties of brittle materials with indirect tensile stresses. The simplicity of the specimen production, test application, as well as results evaluation makes this test attractive. Herein, experimental investigations of different variations of the BDT setup on C−Al2O3 specimens are conducted. Test variations mainly concern the geometry of the load application to ensure a defined failure of the specimens. Digital image correlation (DIC) technique is used to extract the necessary data for the evaluation of the results. Moreover, within an inverse parameter identification method finite element analysis is used to determine strength and elastic material parameters. Additionally, a high‐speed camera is used for the detection of crack formation. It can be concluded that a special variation of the BDT is a suitable method to evaluate the mechanical properties of C−Al2O3. This paper investigates the tensile strength of the brittle ceramic materials. The specimens are made of carbon‐bonded alumina, which is used for open cell ceramic foam filters for metal melt filtration applications. The mechanical tests are performed by means of Brazilian disc test. The results are analyzed by the help of digital image correlation and numerical simulations.