中文摘要：

微损伤是造成耐火材料宏观非线性力学行为的主要原因，研究耐火材料损伤演化的表征方法对其服役过程的仿真具有重要意义为此，利用细观力学方法，采用界面相模型，通过改变界面相的物理参数来等效模拟微观损伤对耐火材料宏观性能的影响、利用该方法，从MgO—C质耐火材料力学试验出发，采用数值拟合的方法得出应变与界面参数的关系；结合耐火材料的损伤机理，建立材料宏观损伤与界面参数之间的数学关系、在此基础上，对MgO—C质耐火材料的拉压非线性行为进行了模拟，研究结果表明该方法可以很好地模拟耐火材料的非线性行为

英文摘要：

Micro-damage is one of the main reasons of the macroscopic nonlinear mechanical behavior for refractories. Study on the damage evolution characterization methods plays an important role on the simula- tion of service process. Effect of microscopic damage on macroscopic properties of refractories was equiv- alently simulated by changing the physical parameters of the interface,and using meso-mechanical meth- od and interface model. In virtue of this method, the relationship between the strain and the interface pa- rameter was built by numerical fitting based on the mechanical experiments of MgO-C refractories. Com- bined with damage mechanism of refractories,the mathematic relationship between the degree of macro- damage and the interface parameter was built. The nonlinear tension and compression behavior of MgO-C refractories was simulated and the results indicate that this method can well simulate the nonlinear behavior of refractories.