軸直角方向外力を受けるボルト締結体挙動の解析的モデルの構築 : 第2報,回転ゆるみのモデル化

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An Analytical model for the mechanical behavior of a bolted joint subjected to a transverse load has been theoretically formulated. This paper focuses on the modeling of self-loosening that is based on the analytical model of the transverse load-displacement relation proposed in our previous paper. While the mechanical behavior of a bolted joint before complete bearing-surface slip was modeled in the previous paper, slip displacement due to complete bearing-surface slip is added in this paper in order to model self-loosening due to both micro and complete bearing-surface slip. In the case of complete bearing-surface slip, slip displacement in the circumferential direction on the thread and bearing surfaces is modeled to be proportional to the torsion torque accumulated during the process of micro bearing-surface slip. From the loosening rotation angle, which is defined as the rotation angle of the bearing surface, and the axial-direction stiffness of the bolted joint, the decrease in bolt tension is calculated. We applied the proposed model to an M16 bolted joint and confirmed that the model is capable of representing self-loosening behavior due to both complete and micro bearing-surface slip. In addition, we show that the model is able to predict the transition from micro to complete bearing-surface slip and the change in loosening rate caused by the decrease in bolt tension.
2010-05-25