Modal characterization of crack network development in an MgO containing refractory castable

Author(s)

Sciuti, Vinicius Fiocco ; Vargas, Rafael ; Canto, Rodrigo Bresciani ; Hild, Francois

• Document type: Journal article
• Source: JOURNAL OF STRAIN ANALYSIS FOR ENGINEERING DESIGN; v. N/A, p. 11-pg., 2023-01-12.

Abstract

Damage due to MgO hydration in castables has been studied by bar resonance and recently by Digital Image Correlation (DIC). The hydration reaction kinetics was studied via principal component analyses (PCA) applied to DIC results of images acquired during 60 h of curing and drying of an MgO containing refractory castable. The experiment was carried out in a in-house climatic chamber at 50 degrees C and 50% of relative air humidity. The displacement and maximum eigen strain fields were obtained via DIC. Their PCA revealed the crack network as the most relevant component, with a temporal development of a sigmoidal curve where a two-parameter Weibull law was satisfactorily fitted. The reaction duration was virtually identical for both fields, and only a time shift in reaction initiation and saturation was attributed to the choice of field. The approach allows the need for user-defined thresholds to be avoided for crack quantification. (AU)

• FAPESP's process: 18/23081-0 - Fracture mechanisms of refractories at room and elevated temperatures analyzed with wedge splitting tests and image correlation
• Grantee: Rafael Vargas Maginador
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 18/02801-4 - Identification of material models for numerical simulation of powder pressing
• Grantee: Rodrigo Bresciani Canto
• Support Opportunities: Regular Research Grants
• FAPESP's process: 18/15266-0 - Detection and quantification of fracture mechanisms of ceramics at room and high temperatures using digital image correlation
• Grantee: Rodrigo Bresciani Canto
• Support Opportunities: Regular Research Grants