塑性域締結におけるねじ締結体の挙動 : 締付け停止時のねじ部トルクの影響

概要

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This paper describes the effect of residual thread torque at the termination of tightening on elasto-plastic deformation of bolts under external load after bolted joints are tightened in plastic region. Firstly, the effect of residual torque is analyzed by use of the flow theory of plasticity, and then the relationship between axial tension and thread torque of the bolt is obtained experimentally. The obtained conclusions are as follows : (1) At the beginning of the external loading, after tightening there is the region regarded as elastic deformation on the relation between axial tension and elongation of the bolt, which is extended with the decrease of residual thread torque. (2) It is recommended to slightly loosen the bolt or the nut after tightening so as to reduce residual thread torque to zero, in order to decrease the additional plastic elongation of the bolt.
1990-03-05