Abstract
The clamping force of the bolted joint is a key factor in maintaining its service performance. However, when the torque wrench is removed after tightening, there will always be a certain degree of loss in the pre-tightening force. Herein, the stress state of the bolt and the nut during tightening and service was analyzed. The repeatability experiment of the threaded fasteners during repeated tightening was carried out to investigate the pre-tightening force loss after the removal of torque wrench (initial loss) and the pre-tightening force loss in a period of service (service loss). Different forms of lubrication was considered, namely without lubrication, thread lubrication and nut surface lubrication. The influence of the pre-tightening force, repeated tightening and lubrication on the initial loss and the service loss was analyzed according to the experimental results. It showed that the pre-tightening force and its loss have a large dispersion. At the first tightening, the pre-tightening force may increase after the initial loss stage. When the lubricant is used, the service loss has a significant positive correlation with its pre-tightening force. The use of lubricant at the threads is easier to lead the service loss of pre-tightening force.
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