Abstract
Taking account of the reuse of bolts and nuts, this paper describes a comparison of threaded-fastener loosening characteristics of bolted joint in the elastic region tightening with those in plastic region tightening and the reason for the difference between them. The experiments are carried out by using the threaded-fastener loosening test machine which applies repeated transverse impact-force. The experimental results are as follows ; in the first use of bolts and nuts, the initial loosening in plastic region tightening is larger than that in elastic region tightening, but for the steady loosening the reverse tendency is found. At the reuse in elastic one, both initial and steady loosening are smaller than those in the first use, but in plastic one both loosenings are larger than those in the first use. The above mentioned results can be explained by the measurements of bolt end displacement, impact block displacement and twisting torque in the loosening test.
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