Abstract
The effective strength of the socket part (threaded hole at both end of pole) at the joint constructed by two poles and one nipple of artificial graphite electrodes was evaluated by using finite element method (FEM) and measured under the uniaxial tension loading. The stress distribution at the socket was analyzed as a function of length of nipple using FEM. The stress at supposed fracture point of the socket was lower as longer the nipple was. The experiment by bending fracture showed that the socket with a long nipple gave higher effective strength than that with the nipple of the JIS size. The results of FEM analysis agreed with those of experiment. The socket with longer nipple is expected to have higher effective strength in electric arc furnace for steel making.
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