The Relationship Between Structural Features and Local Mechanical Properties of a Fine-Grained Matrix in Refractory Ceramic Materials. SiO2 Ceramics Case Study

• Published in: Russian physics journal Vol. 67; no. 4; pp. 388 - 396
• Main Authors: Lapshina, A. A., Shilko, E. V., Buyakov, A. S., Smolin, A. Y., Andreev, K.
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.04.2024; Springer Nature B.V
• Subjects: Ceramics; Compressive strength; Condensed Matter Physics; Crystal defects; Elastic properties; Hadrons; Heavy Ions; Lasers; Mathematical and Computational Physics; Mechanical properties; Microcracks; Modulus of elasticity; Nuclear Physics; Optical Devices; Optics; Photonics; Physics; Physics and Astronomy; Pore size; Porosity; Refractories; Silicon dioxide; Tensile strength; Theoretical; silica refractory; computer modelling; fine-grained matrix; effective mechanical properties; DEM
• ISSN: 1064-8887; 1573-9228
• DOI: 10.1007/s11182-024-03135-y

A numerical investigation of the influence of porosity, pore size, and planar defects (microcracks) on the elastic constants, compressive and tensile strength of a fine-grained matrix in a SiO 2 refractory ceramics is presented. The modeling results show a qualitatively different effect of the 3D (pores) and 2D (microcracks) defects on its effective elastic properties. An increase in porosity leads to a decrease in Young’s modulus and the strength of the refractory matrix, while the trend in the Poisson’s ratio behavior depends on the degree of pore structure connectivity. Microcracks also reduce the effective strength and Young’s modulus of the matrix but, unlike the pores, they cause an asymmetry in the effective elastic properties. The Young’s modulus of the matrix decreases more slowly under compression than under tension, and the Poisson’s ratio trend is the opposite (an increase under compression and a decrease under tension). The quantitative estimates of the effective mechanical characteristics of the fine grain matrix can be used in multiscale computer models of traditional and advanced SiO 2 -based refractories.