基于细观力学的耐火材料单轴拉伸微损伤模型研究  

Microscopic damage model of refractories under uniaxial tension based on microscopic mechanics

作　　者：杨康[1] 王志刚[1] 刘昌明[1] 

机构地区：[1]武汉科技大学冶金装备及其控制教育部重点实验室,湖北武汉430081

出　　处：《耐火材料》2014年第5期352-355,共4页Refractories

基　　金：国家自然科学基金项目(51075310);教育部博士点专项基金(20114219110003);湖北省自然科学基金重点项目(2012FFA022);教育部新世纪优秀人才支持计划项目(NCET-12-0715)

摘　　要：实现定量描述耐火材料非线性力学行为对于评价其损伤演化机制至关重要,因此在单轴拉伸试验的基础上,对材料细观损伤机制进行分析,并结合广义自洽模型,通过构建损伤相弹性模量关于外载荷的损失函数来表征细观损伤演化过程,建立了材料受载状态下的微损伤模型,实现了材料非线性力学行为的定量描述。同时以镁碳质耐火材料为研究对象,对材料在单轴拉伸载荷下的损伤演化过程进行了模拟。结果表明,运用此方法对耐火材料的受拉损伤过程进行表征,其结果与试验结果可以较好地吻合。It is important to realize the quantitative description of the nonlinear mechanical behaviors of re-fractories for evaluating the damage evolution mechanism.Based on the uniaxial tension experiment,the microscopic damage mechanism of the material was analyzed.Combined with the generalized self-consist-ent model,a damage function about the external load based on the elastic modulus of the damage phase was constructed to characterize the microscopic damage evolution.A microscopic damage model under the uniaxial tension load was established,the nonlinear mechanical behaviors were quantitatively de-scribed.Meanwhile,the damage evolution process of the MgO-C refractories under uniaxial tension was simulated.The results show that the characterized result is in good agreement with the experimental result.

关 键 词：细观损伤力学 损伤机制 损伤函数 广义自洽模型 镁碳质耐火材料 

分 类 号：TB35[一般工业技术—材料科学与工程]