![]() It is a fundamental engineering concept that the force in a bolt in an ideal preloaded joint will remain equal to the preload until the externally applied force exceeds the preload. A typical bolt configuration is shown below.įinally, although not a design parameter, the subject of bolt installation preload must be addressed. This further increases the fatigue resistance of the bolt. Therefore, when the bolt bends due to deformation of the connecting rod, the bending stresses are reduced below what they would otherwise be. It reduces the bending stiffness of the bolt. The reduced diameter shank is helpful in another sense. Thus this configuration represents the optimum with respect to fatigue strength. Providing a local fillet radius at the location of the maximum stress further reduces the local notch effect. This leads to the standard configuration used in most ARP rod bolts: a reduced diameter shank and full engagement for the remaining threads. By removing the remaining, non-engaged threads, the local notch effect can be reduced. It is well known that the maximum stress in an engaged bolt occurs in the last engaged thread. In bolts, this would correspond to the notch effect associated with the thread form. Fatigue failure is frequently caused by localized stress risers, such as sharp corners. ![]()
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