With the development of vehicle system dynamics, the multi-body system simulation has been proven as an effective and cost-saving way to obtain fatigue loads of high-speed railway bogies. However, the application of simulated dynamic stress spectra is usually limited to the classical damage accumulation design. Moreover, the advanced damage tolerance philosophy for railway bogies are mainly based on standard prescribed loads or measured loads. To this end, a novel time-domain stepwise fatigue assessment (TSFA) methodology was proposed to effectively bridge the vehicle system dynamics with fracture mechanics. The research results indicate that the welded butt joints of gearbox bracket are the most critical positions for bogie frames made of S355J2W steel with an estimated life of 162.7 years. This is conservative enough for the conventional safety life design. However, the residual life abruptly decreases to 26.4 years once a crack with the length of 6 mm initiates near the weld toe, and the service lifetime of 30 years cannot be covered yet. This agrees well with the practical maintenance cases and full-scale benchmark tests. Therefore, the newly-proposed TSFA approach is suggested while determining the damage tolerance and maintenance strategy of defective bogie frames under complex dynamic vibration responses.


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    Titel :

    An innovative stepwise time-domain fatigue methodology to integrate damage tolerance into system dynamics


    Beteiligte:
    Guo, Feng (Autor:in) / Wu, Shengchuan (Autor:in) / Liu, Jianxin (Autor:in) / Wu, Xingwen (Autor:in) / Zhang, Weihua (Autor:in)

    Erschienen in:

    Vehicle System Dynamics ; 61 , 2 ; 550-572


    Erscheinungsdatum :

    2023-02-01


    Format / Umfang :

    23 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Unbekannt