5. Improving the fatigue life of a bolt
If we exclude the manufacturing process analyzed above and restrict ourselves to the ISO coarse thread bolt (RT) (using a fine thread for the usual mechanical engineering diameters is never a good solution), we can see that improving the fatigue life of a bolt consists in reducing the stress concentration and gradient at the first thread in engagement. Essentially, this means better distribution of stress between the bolt and nut.
We can :
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Improving the fatigue life of a bolt
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