There are many accessories in the coupling, such as elastic pins, elastic pads, bolts, diaphragms, elastic sleeves, tires, retaining rings, etc. Among them, bolts are common wearing parts. Bolts sometimes break, mainly due to insufficient fatigue resistance and unreasonable layout of structural load-bearing members. When designing the coupling, avoid the local stress concentration of the load-bearing member and cause the load-bearing part to break. A smooth transition is made to the root of the connecting stud to minimize the stress concentration factor at the root; in order to improve the bearing capacity of the root of the connecting stud, the root diameter of the connecting stud is increased on the premise of meeting the overall size requirements of the structure.
From the perspective of the bearing capacity of the connecting stud, the connection constraint between the flight control component and the cartridge case can be added at the center of gravity of the overall structure to reduce the bending moment applied to the connecting stud by the electronic assembly and the electronic cabin skeleton, thereby reducing the root of the connecting stud The level of stress experienced. The bolts have initial cracks in the undercut grooves where the stress is concentrated, and fatigue failure occurs under the action of a long time load, which eventually leads to fatigue fracture failure of the bolts. Design the bolt structure reasonably to improve the rough machining of the undercuts and other stress-concentrated parts It is required to reduce stress concentration and improve fatigue resistance. Arrange the bolts reasonably to distribute the bolt load evenly, avoid load fluctuations and prevent fatigue damage of the bolts.
