Laboratory Simulation of Structural Fatigue Behavior

TL;DRAbstract

Designing against fatigue failure involves so many uncertainties that it is usually necessary to test full-scale structures prior to service to prove their reliability. Such tests should be simple, short, and inexpensive. At the same time, it is necessary to insure that the fatigue response of the laboratory test reflects the actual performance that can be expected of the structure in its service environment. The nominal stresses anticipated in a structure in service are usually known or can be estimated. Mechanics analyses have been developed which can be used with smooth specimens or smooth-specimen data to determine local stresses and strains in terms of known nominal stresses even when the local behavior is inelastic. Two methods of solving for the critical stresses and strains are reviewed and compared using notched- and smooth-specimen fatigue data for representative aircraft metals. The approach based upon Neuber's Rule is the most satisfactory and can easily be used to provide

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