2304 転造によるねじ谷底の残留応力分布の推定 : 環状丸溝試験片に対するX線応力測定法の適用(ねじの特性,一般講演)

概要

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A hypothesis was presented concerning the effect of the axial residual stress at the thread root of a bolt induced by thread rolling on its fatigue strength. However, this has not yet been verified since the residual stress which may exist locally around the thread root can neither be measured nor estimated with sufficient accuracy. This study aims to seek the possibility of the application of X-ray diffraction method to the residual stress measurement on the bolt thread root. The measurement has been done for the groove-rolled specimen made of M10×1.25 bolt brank with larger thread pitch and root radius. The results show that the local residual stress should be measured on very small area (the width of which is less than 5 % of the radius), and that only 5 % misalignment in axial direction is allowed for the measurement within 10 % accuracy. Finally, it is concluded that X-ray measurement for M10×1.25 bolts is unrealistic since the collimator of 30 μm diameter with the positioning accuracy of ± 10 μm is necessary.
一般社団法人日本機械学会の論文
2010-04-18