| The deeper cognition for the physical and chemic process in aluminum electrolytic cell,the development of numerical calculation method and computer technology and the improvement of finite element calculating and analytical software provide possibility for the more development of aluminum electrolytic cell's couple field structural emulate and simulation. Because the shell and cradle's distortions have a great affection on the normal working and life of the cell , it's means to get the cell's baking distortions using finite element method and study the laws of heat expansibility's effect on shell and cradle's distortions.The paper has done such study work as follows:1) Full 3D baking aluminum electrolytic cell model including liner material is built bases on the cell's structural character and baking mechanism; using indirect method to compute the model's thermal-structural couple field, the model involves all possible contacting effect and take materiel's nonlinearity into account.2) The thermal-structural couple field's computation is done by the software ANSYS using finite element method.3) The cell's baking distortions and the shell's stress distribution are got, the equivalent thermal expansion pressure load's effecting laws on periphery structure including the shell etc from liner material is studied.4) The loading project for aluminum electrolytic cell's simple computing is given under fully study.The distributing area and maximum of equivalent thermal expansion pressure on surface of liner materiel in baking process is worked out; The changing curve of equivalent thermal expansion pressure under the loading temperature on chamber wall is got, from which the conclusions that under the loading temperature of 400℃, the shell areas receiving the largest equivalent thermal expansion pressure have turned into their plastic yield and that the value as well as working area of thermal stress on shell will increase with the hoist of the temperature is also got.
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