Q: How to improve fatigue resistance?
A: The fatigue resistance of the bolted joint is much smaller than its static bearing capacity. To improve fatigue resistance, designers can increase thread strength and reduce the interfacial stress of threads.
To increase thread strength, we recommend rolling, not cutting. To increase the strength of the bolted joint, multiple smaller fasteners can be used instead of a single large fastener.In addition, improved connectors, such as the Superbolt multi-push pretensioner or Flexnut (elastic telescopic nut). They improve the load distribution of the threads and increase the elasticity of the bolted connections, thereby increasing the strength of the bolted joints.
To improve fatigue resistance, the best way is to reduce the alternating stress on the thread, and the main way is three: component design, component fastening, component protection.
In the process of designing the components, we have the opportunity to improve the load distribution of the bolted joints and reduce the external stresses on each joint. To do this, please keep in mind the following principles:
1. Use the maximum preload as much as possible
2. Minimize bolt to load eccentricity
3. Use the largest contact surface possible
4. Use the largest clamping length possible
5. In most cases, the preload should be higher than the workloadNeck studs or bolts, as well as spring washers, can be used to design the components to counteract the effects of looseness, creep and thermal differential stretching.
In terms of tightening the assembly, achieving the necessary preload is a major factor in reducing the alternating pressure. High-precision calibration tools and suitable lubricants are recommended to ensure pre-tightening accuracy and reduce the risk of seizure. Properly tightened to reduce the risk of uneven bolt loading and ensure the integrity of the entire bolt connection.
As for component protection, consideration should be given to preventing the bolt connection from losing pre-tightening force and also to avoid environmental impact of the component, such as corrosion that may induce fatigue cracks. To this end, the right material and / or coating should be selected for the parts and fasteners.
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