静的強度の高い鋼材より製造されたねじ継手の疲労強度

概要

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The fatigue tests under the pulsating tension were performed of the threaded joints made of the steel bars entirely hardened by the high frequency induction heating and tempered to the various values of ultimate tensile strength. The threading was made by means of cold rolling after the heat treatment. The results obtained are as follows : (1) The relationship of the static tensile strength of steel bar and the fatigue strength of the threaded joint made of the bar varies with the difference of mean tensile stress in the fatigue test. Under the low mean tensile stress, the increase of the static tensile strength of the bar contributes to the increasing of the fatigue strength of the threaded joint. Under the high mean tensile stress, the fatigue strength of the threaded joint does not vary with the difference of the static strength of the bar. (2) It has been said that the fatigue strength of the threaded joint does not vary with the difference of mean tensile stress. However, the effect of mean tensile stress is apparent in the threaded joint made of the steel bar having the high static strength.
社団法人日本材料学会の論文
1965-07-15