Within the scope of this paper the determination of the remaining lifetime of wheelset axles is investigated using experimental, numerical and analytical methods. For the analytical simulation the program system NASGRO developed by the NASA is used. The numerical simulations have been performed using ADAPCRACK3D. Moreover experimental investigations are used for the optimization of a component test. Due to technical restrictions of the test rig randomly distributed load-time-functions cannot be used. Thus prior to the component experiments preliminary studies have been performed on CT specimen of the same material using different load sequences. From the economical point of view an optimal utilisation of the material is postulated so that conservative predictions have to be avoided. But more significant is the question regarding safety of a component. In order to endanger neither human beings nor the environment, conservative predictions are permitted. Starting the simulation with the detectable crack size and the appropriate POD the remaining lifetime and the necessary inspection time is calculated. Within the inspection time the number of inspection intervals can be calculated, whereby the inspection intervals can be equally spaced or variable in length.
Investigations of fatigue crack growth in wheelset axles
2009
7 Seiten, 8 Bilder, 3 Quellen
Aufsatz (Konferenz)
Englisch
Usage related design and validation of wheelset axles
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