The stress–strain behavior of refractory microcracked aluminum titanate: The effect of zigzag microcracks and its modeling

• DOI: 10.1111/jace.19325
• Publication Date: 2023-07-15T13:15:41Z
• Authors: Mossaab Mouiya; Mikhail Martynyuk; Andreas Kupsch; René Laquai; Bernd R. Müller; Nicolas Tessier D...; Youssef Tamraoui; Itziar Serrano‐Munoz; Marc Huger; Mark Kachanov; Giovanni Bruno
• Keywords: Brittleness; Hysteresis

Abstract The stress–strain behavior of ceramics, such as aluminum titanate, has certain features that are unusual for brittle materials—in particular, a substantial nonlinearity under uniaxial tension, and load–unload hysteresis caused by the sharp increase incremental stiffness at beginning unloading. These observed experimentally attributed to microcracking. Here we compare different degrees titanate materials quantitatively model them. We use advanced mechanical testing observe response room high temperature; electron microscopy, X‐ray refraction radiography microstructural changes. Experiments show two types microcracks can be distinguished: (i) induced cooling from sintering temperature (due heterogeneity anisotropy thermal expansion), with typical sizes order grain size, (ii) much larger generated loading. microcrack produce effects on curves. Such depend density cooling‐induced distribution sizes. They modeled analytically numerically.