鋼線の疲労に関する研究(第7報) : 硬鋼線の曲げ疲労における寸法効果

概要

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An invesitigation of the size effect on fatigue strength under bending and on damage properties of hard drawn steel wire has been carried out on 0.4%C (σ_B=130kg/mm^2) and 0.6%C (σ_B=165 kg/mm^2) wires ranging in size from 1.2 to 3.3 mm in diameter. The principal results of this investigation can be summarized as follows : (1) Fatigue strength of hard drawn steel wires having the same tensile strength decreases with the increase of diameter. Fatigue limit of 1.5 mm wire is 6~8% higher than that of 3 mm wire, and the size effect on fatigue limit is more remarkable at 0.4%C wire than 0.6%C wire. (2) For the size effect on fatigue limit under rotating bending of hard drawn steel wire, we present the following experimental equation [numerical formula] where σ_<Wd>' and σ_<W3>' are respectively fatigue limit of any diameter d and 3 mm diameter wire. m is materialial constant. (3) Fatigue damage by overstressing is difficult to occur as the wire becomes finer, so the size effect can also be recognized on fatigue damage.
1963-11-15