コイルばねの疲労変形

概要

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Coiled springs are used in many kinds of automatic or semi-automatic product machines. If the fatigue deformation takes place in these springs, even if fatigue failure may not occur, the capacity and the accuracy of these machines may be affected adversely. Investigations on the fatigue deformation of the coiled spring have not deen conducted extensively so far. In this report the fatigue deformation limit diagram is studied experimentally on the three kinds of the coiled spring of steel wire, that is untreated, heated and setting. The results obtained are as follows : (1) The effect of secular change on the fatigue deformation of coiled spring is negligibly small but the effect of elastic-after effect can not be neglected on the untreated coiled spring. Therefore, the fatigue deformation is necessary to be measured as soon as possible after unloading. (2) The fatigue deformation limit of the untreated coiled spring is the lowest, but by heating these, the limit increases remarkably. It seemes tat such an increase of the fatigue deformation limit by heating is mainly due to age-hardening. (3) The fatigue deformation limit diagram of the coiled string used in this experiment is curved above the staight lime of 45 degrees with the axis of abscissa (mean stress axis).
社団法人日本材料学会の論文
1963-04-15