1159 軸肥大加工部材の疲労特性

概要

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From a viewpoint of practical use of round shaft with a collar predicted by a new conceptual plastic deformation method, two kinds of fatigue tests were carried out against specimens with a collar and round bars before worked in order to clarify the fatigue damage and fatigue strength properties of worked ones. In spite of with or without of burr, specimen with a collar, which was formed at the center of round bar, had scarcely been subjected to fatigue damage up to diameter expansion ratio of 1.7times. a specimen with burr tends to decrease slightly in fatigue strength with increasing failure life, and has a distinct fatigue limit. Also, if the expansion of shaft diameter were performed below ζ=1.8,fatigue damage might not occur during plastic collar forming process. It was demonstrated experimentally that if notch effect is considered through stress concentration at the root of a collar, the round shaft with a collar completely is not inferior to a shaft material before formed a collar in fatigue strength.
一般社団法人日本機械学会の論文
2003-08-05