Abstract
In this paper, the comparison of the elastic region tightening with the plastic region tightening is investigated with emphasis on reusing characteristics of bolts. The tightening and loosening of bolts and nuts are repeated in tightening tests by the torque gradient, the angle and the torque control methods, respectively. The following results are experimentally confirmed: (1) The tightening axial force increases with number of repetitions by every control method, but the torque gradient control method which tightens bolts to the limit of elasticity is the most stable one. (2) The torque gradient control method is superior to other ones with regard to the reusing characteristics in the condition that an external force is loaded and unloaded to the fastened bodies in the direction of the bolt axis. (3) Plastic elongation of the bolts by the angle control method of plastic region tightening generates at the idle thread part between the fastened bodies, and then spreads to the fitting part of the bolts and nuts as the number of repeated tightening increases, so that the number of reusing cycle is limited.
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