The coefficient of friction has a great influence on the moment coefficient. The magnitude of the coefficient determines the slope of the moment coefficient. The bolt connection can cause the change of friction coefficient due to impact vibration, multiple assembly and disassembly, contact surface machining quality or wear condition. K1 and K2, which play a decisive role in the tightening torque, cause large fluctuations. Therefore, in the connection, it is necessary to ensure a stable friction coefficient so as not to cause the tightening torque to rapidly decrease and loosen.
After the elastic slack tightening bolt is completed, due to the pre-tightening force, the bolt is elastically deformed at the beginning, which will cause local plastic deformation over time, which causes the elastic force to relax. The joint surfaces are affected by factors such as pitch error, roughness, burr and damage during installation. In addition, the internal stress of the bolt must produce certain local plastic deformation, with the influence of external working environment and the accumulation of external load. The role will cause the local plastic deformation to continue to increase, which will cause the initial loosening of the joint. When the joint is fully adapted to the working environment and the external load, the loosening process will stop reaching a certain stable state, so the elastic slack will inevitably cause the joint to a certain extent. The initial looseness on the upper part of the looseness may result in further reduced reliability or even loss of working ability if not handled in time.
In the bolt connection, when subjected to a lateral load, that is, a load perpendicular to the axial direction of the bolt, a variable load or vibration, the coupling may be loosened. Due to the lateral load of the tight bolt connection, in addition to the lateral working load, it may also be subjected to lateral vibration caused by various reasons. If the vibration frequency is high, the vibration 1 force will gradually reduce the loose torque, and the experiment shows that when the vibration force is Increasing to a certain value may reduce the coefficient of friction to zero. In turn, the tightening torque determined by friction is completely lost, and the pre-tightening action is lost, so that the joint is loosened and fails.
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