基于PFC^(2D)的镁碳质耐火材料断裂行为模拟研究  

PFC^(2D)-based simulation study of the cracking behavior of MgO-C refractory

作　　者：常庆明[1] 程钊[1] 袁丹丹[1] 张浩[1] 桑绍柏[1] 潘成刚[1] 

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081

出　　处：《武汉科技大学学报》2016年第4期273-277,共5页Journal of Wuhan University of Science and Technology

基　　金：国家自然科学基金资助项目(51372176)

摘　　要：将镁碳质耐火材料视为骨料和细粉基质组成的两相复合材料,采用基于离散元的颗粒流模拟软件PFC2D,将材料离散成刚性颗粒组成的模型,把颗粒细观参数的变化与宏观力学特性联系起来,构建镁碳质耐火材料在1000℃下的试验模型,模拟试样三点弯曲的载荷-位移曲线,对材料裂纹的扩展进行分析,并通过改变摩擦系数、平行粘结刚度比、孔隙率以及平行粘结弹性模量,对比分析细观参数对载荷力峰值大小的影响情况。结果表明,采用PFC2D可准确模拟镁碳质耐火材料在三点弯曲时的断裂行为;材料的摩擦系数和平行粘结弹性模量与试样所受最大载荷力呈正比关系,而孔隙率和平行粘结刚度比与试样所受最大载荷力呈反比关系。MgO-C refractory material is regarded as a two-phase composite material consisting of aggregate and fine powder.In this study,particle flow simulation software PFC^2 D,which is based on discrete elements,was employed to discretize the material into a rigid particle model,and the microscopic variation of the particles was related to the macroscopic mechanical properties of the material.Under 1000℃,the experimental model of the MgO-C material was established,and three-point bending load-displacement curves of the samples were simulated.Material crack propagation was analyzed,and by changing the friction coefficient,parallel bond stiffness ratio,porosity and elastic modulus of the whole model,the influence of microscopic parameters on the value of the peak load was compared.The results show that PFC2 Dcan accurately simulate the three-point bending fracture behavior of the magnesium carbon refractory material.The friction coefficient and parallel bond elasticity modulus of the material are proportional to the peak load force of the samples,and the porosity and the parallel bond stiffness ratio of the material are inversely proportional to the peak load force of the samples.

关 键 词：镁碳质耐火材料 离散元 三点弯曲 断裂行为 细观力学 颗粒流 PFC^2D 

分 类 号：TQ175.15[化学工程—硅酸盐工业]