S112023 残留応力がボルトの疲労強度に及ぼす影響 : 残留応力を付与したリードなしボルトの疲労特性([S11202]機械要素の設計・製造・応用技術(2))

概要

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A hypothesis was presented concerning the effect of the axial residual stress at the first thread root of a bolt on its fatigue strength. However, this has not yet been verified since the residual stress which may exist locally around the thread root cannot be measured or estimated with sufficient accuracy. This study aims to clarify the relationship between the residual stress and the fatigue strength quantitatively. In this report, the residual stress which can be estimated by 2-D FE analysis is induced by preloading on the thread root of leadless (axi-symmetrical) bolt. The results from fatigue tests in low mean stress condition (Rs=0.1) show that the preloaded specimens have higher fatigue strength than non-preloaded specimens. However the local stresses calculated by 2-D FE analysis based on the fatigue limit loadings are smaller than that of notch-free specimen because of the effect of the bending stress generated by the sliding action of the split adapter, the compressive axial residual stress decreases the mean stress in fatigue loading and this cause the apparent increase of the fatigue strength as described in the hypothesis.
一般社団法人日本機械学会の論文
2011-09-11