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Previous theory overestimates the tightening torque in the relation between preload and tightening torque.
Preload is proportional to the tightening torque at placement.
Furthermore, the probabilistic bolt load distributions of the three-bolt joints in four tightening torque conditions, including finger-tight, wrench torque, standard tightening torque and relaxation tightening torque, were investigated.
The methods for improving bolt-nut tightening torque include: (1) high torque jumbolter.
At a higher range of tightening torque, the fatigue life decreased with the increasing tightening torque, and the fretting fatigue failure occurred near the bolt hole.
Hence, tightening torque on the one hand has a significant effect on screw loosening [10].
Preload: initial tightening torque 400 N·m, anchoring force 190 kN or more.
According to the conversion relationship, the bolts' tightening torque should be 300 500 N m.
These results were shown in the tightening torque and fatigue life diagram.
Second, the slipping resistance and rotational stiffness of right-angle couplers increase with bolt tightening torque.
Within the limitations of this study, tightening torque had a significant effect on screw loosening.
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