塑性域締結におけるねじ締結体の挙動 : ひずみ増分理論による解析

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This paper describes an investigation on the behavior of bolted joints tightened in plastic region based on the numerical analysis by use of the flow theory of plasticity. A thread part of a bolt is idealized as a smooth cylinder. The change of axial tension, torque and stress distribution are discussed for two kinds of loading paths, namely the initial tightening. and the subsequent axial loading processes. In the analysis, the torque and the axial tension are applied proportionally in the initial tightening up to a certain value of the elongation of a bolt, and the subsequent external axial load is imposed to the bolt keeping the torsional angle constant. The numerical simulation can duplicate the characteristic change of torque and axial tension observed in experiment that the torque decreases rapidly with increasing external axial load. The tensile stress distribution, which had a peak at the center of the cross section of a bolt in the external loading process with decreasing shear stress.
1988-01-05