G030162 軸方向外力を受ける中空円筒ねじ締結体の内力係数と座面永久変形にっいて([G03016]材料力学部門一般セッション(16):応力分布)

概要

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An important issue is how to determine a bolt preload of a bolted joint taking an external axial load into account. One method for determining the bolt preload is such that the stress at the bearing surfaces is less than the yield stress of the clamped parts taking account of the load factor. Another method is such that the stress at the bearing surfaces is higher than the yield stress of clamped parts. Firstly the load factor to obtain the increment F, in the axial bolt force is investigated using axi-symmetrical theory of elasticity, FEM analyses and experiments. Then, the contact stress distributions and the plastic displacement distributions at the bearing surfaces under external loads are examined using elasto-plastic FEM analyses. The prediction for the reduction in axial bolt force of the joint under external load is fairly consistent with the experimental result. It is noticed that a higher bolt preload according to the second method shows a small reduction in axial bolt force. Discussion is made on the critical stress at the bearing surfaces.
2011-09-11