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It is proposed that long service lives may be attained by selecting a fastener system which keeps the stress intensity range during service below the threshold stress intensity range. Using this criterion one may specify the maximum flaw size (from prior damage or initiated by fretting) which will be permanently retained by the residual stress field surrounding the fastener.
An analytical procedure which can be employed to obtain stress intensity factors for practical fastener crack configurations is demonstrated with results for open holes, cold-worked holes, interference fit fasteners, and pinloaded holes. In addition, threshold stress intensity factor data are taken from the literature and presented in a form convenient for use by the design engineer.
fatigue (materials), residual stress, mechanical properties, mechanical fasteners, fracture properties
Air Force Materials Laboratory, Wright-Patterson AFB, Ohio
Air Force Flight Dynamics Laboratory, Wright-Patterson AFB, Ohio