Abstract
In the decisive specifications, for preloaded bolts a subsequent control of the assembly is specified. Among others, preloaded bolts have to be checked for overtightening. If a bolt is classified as overtightened, this can result in the entire bolt group having to be replaced. In addition to the high cost of replacement, this often means that further work has to be temporarily halted. However, there is a lack of knowledge about the degree of utilization of the bolt defined as overtightened. The results of first experimental investigations as well as numerical analyses suggest that over-elastic preload forces only have a significant influence on the load bearing behaviour when exceeding a certain point. The assessment of preloaded bolts with respect to overtightening as given in specifications seems to be too general – and for the bolt lengths so far investigated too conservative.
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