Numerical investigation of refractory stress-strain condition under transient thermal load

Abstract

A method for modeling thermal destruction of periclase-carbon refractories is proposed. The method is based on the growth of fatigue cracks at elevated temperatures. The stress-strain state of the refractory under the influence of thermal and mechanical factors was determined in dynamics throughout the entire operation cycle. Chemical and abrasive wear of the material were not considered. For calculations, the finite element method was used. Energy criterion was used for calculations of crack growth. The probability of crack growth was determined using the results obtained previously for the stress-strain state of typical defects of refractory materials under the action of a tensile load. Thermal, energy and deformation criteria were formulated that determine the probability of the onset of cracks growth.