Thermodynamic-Consistent Microplane Theory for Materials at High Temperatures

Abstract

In this work, a temperature-dependent thermodynamically consistent Microplane Theory is developed at material level to simulate the mechanical failure behavior of quasi-brittle materials like concrete exposed to high temperature fields under dominant tensile stresses. As it is well known, the combination of mechanical and thermal phenomena strongly affects the material brittleness. A temperature-dependent failure criterion based on the smeared cracked approach depending on normal and shear micro-stresses acting on each microplane is implemented. Finally, with the aim to validate the developed constitutive model, obtained numerical results are contrasted against experimental examples from the bibliography.