不同铝电解时间下阴极炭块的损伤特性研究  

Damage Properties of Carbon Cathodes Under Different Aluminium Electrolysis Time

作　　者：刘庆生[1,2] 何文[3] 曾芳金[1] 薛济来[2] 

机构地区：[1]江西理工大学冶金与化学工程学院,江西赣州341000 [2]北京科技大学冶金与生态工程学院,北京100083 [3]江西理工大学工程研究院,江西赣州341000

出　　处：《材料工程》2013年第7期92-96,共5页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(50904028;51264011);江西省教育厅青年科学基金资助项目(GJJ12365)

摘　　要：对不同铝电解时间下的阴极炭块试样进行了单轴压缩实验,建立了阴极炭块的损伤本构方程。实验和理论分析结果表明:与未铝电解的炭块相比,铝电解环境下受熔盐腐蚀的炭块内部存在更多和分布更不均匀的化学腐蚀损伤,从而导致阴极炭块弹性模量、峰值应力和残余变形能力的降低,铝电解时间越长,降低程度越大。采用真实破裂过程分析软件RFPA2D对阴极炭块的单轴压缩破坏实验进行了数值模拟,通过与理论、实验结果比较发现数值模拟可有效地用于研究和再现阴极炭块变形破坏的全过程及局部的变形破坏特征。Uniaxial compression experiments were conducted to obtain the stress-strain curves of carbon cathode samples under different aluminium electrolysis time, and the damage constitutive model of the carbon cathode was established. Experimental and theoretical results show that properties of the corroded carbon cathode, such as elastic modulus, peak strength and residual deformation, are de graded compared with the non-aluminium electrolysis ones, which are caused by the increasing of initial microscopical damage regions that random distributed in the carbon cathode. The uniaxial compression test of the carbon cathode was numerical simulated by the Realistic Failure Process Analysis software RFPA2D, and the simulation results match well with the theoretical and experimental ones. It is confirmed that the numerical simulation can be used effectively to represent the deformation and fracture process of carbon cathodes.

关 键 词：铝电解 阴极炭块 损伤 本构模型 数值模拟 破裂过程 

分 类 号：TF821[冶金工程—有色金属冶金]