Simulation Of The Nonlinear Mechanical Behavior Of Refractory Materials Based On Interface Model

Refractory material is widely used in high temperature industrial. How to improvethe service life of the refractory material is always the focus of many researchers.Refractory material is typical heterogeneous multiphase material, the heterogeneity ofits microscopic structure makes refractory material has the complex nonlinearmechanical behavior and damage form. The macroscopic damage of traditional analysismethods ignore the complex internal microstructure of material, it is difficult to revealthe close relationship between the macroscopic damage behavior with microstructure ofmaterial. Therefore, based on micromechanics, the nonlinear mechanical behavior ofrefractory materials was studied in this paper. Main works and achievements of thethesis are as follows:1.The relationship between parameters of the interphase (elastic modulus, volumefraction, coefficient of thermal expansion) and the macroscopic mechanical propertiesof materials was studied by micromechanics and the interphase model for particulatecomposites with imperfect interfacial bonds.2.The damage function of elastic modulus and volume fraction of interphase wasreasonably constructed. The nonlinear mechanical behavior of refractory caused bydamage was equivalent simulation by change the physical parameters of interphase.Based on the mechanical experiment of magnesia carbon refractories. The nonlinearstress-strain curve of refractory materials under different load form was simulated.3.Analyzed the influence of high temperature on mechanical properties ofrefractory, build the relationship between the physical parameters of interphase withtemperature. The decrease of mechanics performance of refractory material caused byhigh temperature was equivalent simulation by change the physical parameters ofinterphase. Combining with the mechanics of experiment and damage mechanism, thenonlinear stress-strain relationship at high temperature was simulated.In this paper, on the basis of interphase model and damage mechanics theory, thenonlinear mechanical behavior of refractory was simulated under normal temperatureand high temperature. It provides a new idea to study nonlinear mechanics behavior ofthe refractory.