We present the results of investigation of the axles of wheels of An-124 "Ruslan" aircrafts after failures occurring either in service or in the process of resource testing. It is shown that, in service, the axles fail according to the intergranular mechanism. At the same time, in the course of stand tests, we observe fatigue fracture. On the basis of the analysis of the structure of landing gear and the results of investigation of external factors, we propose a model of formation and propagation of cracks in the axle of a wheel. We also propose several procedures aimed at the prevention of failures.
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