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

Autor(es)

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

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF STRAIN ANALYSIS FOR ENGINEERING DESIGN; v. N/A, p. 11-pg., 2023-01-12.

Resumo

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)

• Processo FAPESP: 18/23081-0 - Análise dos mecanismos de fratura de refratários a temperatura ambiente e elevadas com o método da cunha e correlação de imagens
• Beneficiário: Rafael Vargas Maginador
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 18/02801-4 - Identificação de modelos de material para a simulação computacional da prensagem de pós
• Beneficiário: Rodrigo Bresciani Canto
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• 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