人造黒鉛電極接続部に用いられるニップルの応力解析

概要

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The effective strength of nipple in the joint part constructed by two poles and one nipple as artificial graphite electrodes was investigated in the uniaxial tension loading. The theoretical stress distribution of nipple was analyzed using the finite element method in the several types of distributed loads on the surface of each thread which was contacted with the thread of pole. It became clear that stresses were concentrated to the area around the maximum diameter in the case of JIS nipple and the decrease of height of thread near the maximum diameter caused higher effective strength of nipple. These results of the analysis suggested a certain shape of nipple, in which the height of threads were decreased by a cutting line with the origin on the top of thread at the minimum diameter and smaller taper than that of JIS. According to these analytical results, this nipple was machined, jointed to poles and fractured by bending moment, and it showed higher effective strength (bending moment) than that of JIS nipple. These results agreed with the data of theoretical analysis by a finite element method. This nipple is expected to have high strength for use in electric arc furnace.
1992-06-01