For the fatigue assessment of bogie frame for rolling stock there are different approaches. The normative requirements contain the endurance limit approach with maximum amplitude loading and the cumulative damage approach with variable amplitude loading. In this paper the application of these several fatigue assessment methods is represented for the vertical main loading of a bogie frame for a light rail vehicle. That is carried out for the normative loaded requirements with constant and variable amplitude loading after and also for a vertical force range spectrum deriving from a multiple body system simulation of this railway vehicle. The determination of equivalent stress ranges for some selected stress points of the bogie frame allows for comparison the several fatigue assessment methods. The selected stress points refer to welded joints of bogie frame with relatively high stress level. The comparison of stress analysis for the selected stress pointes show, that the fatigue capacity by the assessment with the derived vertical force range spectrum of multiple body system simulation is significant lower than in the case of other fatigue assessments. The potential and the advantages of the fatigue assessment with the real loading assumptions are visible. But for the rolling stock applications of this assessment method safe ways for the determination of service spectrum and for the derivation of real loaded spectrum are not sufficient existing. Therefor further developments are necessary for the railway loading condition.
Fatigue strength evaluation of railway vehicle structures by different methods and load assumptions
2009
10 Seiten, 4 Bilder, 4 Tabellen, 8 Quellen
Aufsatz (Konferenz)
Englisch
Fatigue strength analysis of a welded railway vehicle structure by different methods
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