S112022 ボルトの疲労強度に関する仮説の検証 : ねじ谷底の局所的応力に基づくリードなしボルトの疲労強度の推定([S11202]機械要素の設計・製造・応用技術(2))

概要

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Some hypotheses have been proposed concerning the fatigue strength of a bolt based on Ishibashi's hypothesis. However these are not verified completely since it is difficult to estimate the local stress distribution accurately. Incomplete thread of nut near the bearing surface induced by a thread lead angle is one of the major factors which makes the stress estimation difficult. This study aims to verify the hypothesis concerning the fatigue strength of the bolt based on the local stress. To exclude the effect of incomplete thread of nut, lead-less bolt is used in this study. Local stress on the thread root is estimated by 2D Finite Element Analysis, and compared with the result from fatigue test using leadless bolt/adapter assembly. The fatigue strength of a leadless bolt estimated from the local stress obtained by FE analysis is about half of the fatigue strength of notch-free specimen. However, it was found that the bending moment was acting on the leadless bolt due to the shear force caused by split part of the adapter.
一般社団法人日本機械学会の論文
2011-09-11