Abstract
A simulating fatigue testing method and requirements are explored to evaluate quantitatively the durability of components which cannot be conveniently and economically tested. Three requirements for analogies are necessary, i.e. the geometry and manufacturing quality of critical detail, stress and stress gradient at the expected cracking plane, and the crack initiation position and crack propagation path. The initial fatigue quality (IFQ) of components may be described by using the simulation test results and the extreme value theory. The distribution of time to reach any given crack size and the probability of crack exceedance, which is the measurement of componental damage in service, are then obtained. Taking aircraft wheel hubs as an example, predictions resulting from simulation tests are verified by a full-scale component fatigue test, and would be acceptable for durability evaluation.
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