Simulation Of Nonlinear Mechanical Behavior Of Refractory Materials Based On Cohesive Model

Refractory materials is a kind of high temperature resistant materials.It is the essential basic materials in manufacturing lining of furnaces and high temperature vessels.The bad service environment and complex working conditions of refractory restrict it's service life seriously.The macroscopic failure of refractory usually is the results of microscopic structural damage accumulation and evolution.It is of great significance to research the influence of microscopic damage form to macroscopic mechanical behavior of refractory.In the case of magnesia carbon refractory,the relationship between microscopic damage interface and macroscopic mechanical behavior of refractory was studied by the method of combine micro-mechanical approach and FEM in this paper.The main works and achievements of this thesis as follows:1.From the point of micro-mechanics,the cohesive model was applied to simulate the mechanical behavior during the cracking process,the interfacial debonding mechanism was studied and the influence of different interfacial property to the mechanical behavior during debonding process was quantitatively described.It provides a new idea to study interfacial damage model.2.Based on the thought of Random Sequential Adsorption,the multi-particle dispersion distribution RVE model of refractory was established by secondary development of finite element software with Python.The RVE model was able to reflect the truly micro-structure of particle reinforced refractory composites.3.In the case of multi-particle dispersion distribution RVE model under the condition of uniaxial tension,the stress-strain curve of the model was simulated,the influence of the size and number of particle phase to macroscopic nonlinear mechanical behavior of refractory material were studied.The simulation results show that the addition of particle phase improved macroscopic effective modulus and rigidity of refractory,played a role in enhancing material.In this paper,on the basis of micro-mechanics and cohesive model,the multi-particle dispersion distribution interfacial damage model of refractory was built,and the macroscopic behavior of refractory under uniaxial tension was simulated.Itestablished the foundation for the future research on the relationship between microscopic damage and macroscopic nonlinear mechanical behavior of refractory.