2402 ねじ結合体におけるボルトの疲労強度 : ナットとめねじアダプタを用いた場合の比較

概要

論文の詳細を見る
The fatigue strength of a bolt in bolted assemblies is one of the most important characteristics in designing machinery or structure. JISB 1081 (ISO 3800) specifies the conditions for carrying out axial load fatigue tests on threaded fasteners, in which the use of threaded test adapter is allowed as an internally threaded component as well as standard ISO nuts. It is known that the fatigue strength of a bolt is dominated by the stress concentration at the first thread root, and is affected by the specifications of a nut mated. Moreover, the fatigue strength of a bolt mated with threaded adapter may further be changed due to the difference of the location of the bearing face. In this paper, the effect of the type of internally threaded components on the fatigue strength has been investigated both by fatigue testing and FEM analysis aiming to clarify the contents of "fatigue notch factor" of a bolt. The results show that the fatigue strength of a bolt mated with threaded adapter is significantly higher than that with ISO nut only when the maximum load is relatively low, and such a phenomenon can be explained by the stress distribution at the first thread root of the bolt.
一般社団法人日本機械学会の論文
2002-09-20