K Factors-Example-2
As a group of fasteners are tightened, those, which were tightened first, will tend to relax slightly. This is due to the creep and flow of heavily loaded thread and joint contact surfaces. Still more relaxation results from the elastic interactions between a group of bolts as they are tightened one-by-one. The first bolts tightened partially pull the joint together. As we tighten the rest of the bolts the joint is further compressed, and the previously tightened bolts tend to relax and lose some of their preload. In some cases, this can virtually eliminate our bolt tension.
