Digital image correlation applied to in situ evaluation of surface cracks upon curing of MgO-containing refractory castables

Autor(es)

Sciuti, V. F. ^[1] ; Hild, F. ^[2] ; Pandolfelli, V. C. ^{[3, 1]} ; Santos, T. ^[1] ; Smaniotto, B. ^[2] ; Canto, R. B. ^{[3, 1]}

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Grad Program Mat Sci & Engn PPGCEM, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Paris Saclay, LMT Lab Mecan & Technol, CNRS, ENS Paris Saclay, F-94235 Cachan - France

^[3] Fed Univ Sao Carlos UFSCar, Dept Mat Engn DEMa, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the European Ceramic Society; v. 41, n. 1, p. 1003-1014, JAN 2021.
• Citações Web of Science: 3

Resumo

MgO particles are added to high-alumina castables to provide in situ spinel formation at high temperatures. However, the MgO hydration upon curing may damage the material because of localized volumetric expansion. Usually, damage is evaluated by the ex situ overall measurement of Young's modulus changes during processing via Impulse Excitation Techniques. In this paper, an experimental setup was designed to use Digital Image Correlation (DIC) as an in situ alternative to evaluate damage. Tomographic scans highlighted that all cracks initiated on the sample surfaces, and propagated in the bulk in an intergranular mode. Crack initiation and growth were assessed, for different temperatures, via Surface Crack Density (SCD) measurements, and Mean Crack Opening Displacement (MCOD) fields. They provided important insights into heterogeneous expansion phenomena and crack network quantification; for example, the SCD flattened while the overall damage was still increasing. The results attested the usefulness of DIC for in-situ quantification of ceramics cracking during processing. (AU)

• Processo FAPESP: 18/15266-0 - Detecção e quantificação de mecanismos de fratura de cerâmicas em temperatura ambiente e elevada via correlação de imagens digitais
• Beneficiário: Rodrigo Bresciani Canto
• Modalidade de apoio: Auxílio à Pesquisa - Regular