アーク製鋼炉用黒鉛電極の熱応力破壊の解析

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In this paper, the thermal stress in the graphite electrode, which is connected typically three rods of 20" in diameter, is analyzed by an elastic theory as an axially symmetrical thermal stress of cylinder with finite length. The axial and radial temperature distributions in electrode during the regular power (RP), high power (HP) and ultrahigh power (UHP) operations in arc steel making, are assumed with reference to the actual data of steel making arc furnace measured by Nedopil and Storzer. For the reason of convergency of analytical solution in the center of cylinder, the hollow cylinders with a small hole in the center are treated. These hollow cylinders are used partly at present because of the arc stability. The distributions of principal stress components were calculated numerically using the anisotropic mechanical properties of graphite at the temperature as a function of operating conditions of RP, HP and UHP.The results of hollow electrode with small hole obtained here may be extended to the case of solid electrode for the evaluations of maximum thermal stress which occurs at the outer surface of electrode. The values and the positions of maximum stresses are discussed in comparison with the anisotropic properties of mechanical strength of graphite, and are investigated the current carrying capacities of graphite electrode. These analytical results agree very well with the actual fracture phenomena of graphite electrode observed in a model arc furnace.
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アーク製鋼炉用黒鉛電極の熱応力破壊の解析

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