Pre‐tensioning for Preventing Fatigue Failure in Bolts: Simple Theory and an Account of Experiments Carried Out at the R.A.E.

Abstract

The prevention of fatigue in bolts by controlled pre‐tensioning is investigated theoretically. It is shown that the effect of pre‐tension is to reduce the alternating load in the bolt and that the stiffness of the fitting plays an important part in this reduction. Fatigue tests on ¾‐in. B.S.F. bolts with various amounts of pre‐tension show how this reduction in alternating load can prevent fatigue failure. A warning is given against relying on the benefits of pre‐tensioning without ensuring that pre‐tension is maintained in service.

Citation

Fisher, W.A.P., Cross, R.H. and Norris, G.M. (1952), "Pre‐tensioning for Preventing Fatigue Failure in Bolts: Simple Theory and an Account of Experiments Carried Out at the R.A.E.", Aircraft Engineering and Aerospace Technology, Vol. 24 No. 6, pp. 160-163. https://doi.org/10.1108/eb032166