不同铝电解时间下阴极炭块的损伤特性研究

摘要

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 degraded 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.%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.