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Research on fatigue life and damage tolerance design of metro bogie frame

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Abstract

Traditional evaluation of accumulative damage calculates fatigue life of metro’s bogie frame based on material properties and stress spectrums, which has limitation on evaluating accurate life due to non-crack assumption. In this paper, crack propagation is numerically simulated to give more accurate result, showing that a crack’s initial geometry has great effects on reducing fatigue life cycles, and the count of cycles required for a crack with an initial size of 3 mm and 5 mm to propagate to an equivalent crack length is 68.5 % and 48.3 %, respectively, in comparison to a 2 mm initial crack size. On this basis, damage tolerance analysis is introduced for optimizing anti-fatigue evaluation strategy and maintenance periods. The results suggest that accumulative damage and damage tolerance methods should be comprehensively combined for staging evaluation of bogie frame’s fatigue life, by establishing a control boundary between the initial crack and the critical crack, proactive repairs can be executed, which facilitates the ongoing usability of the bogie frame, leading to an extension of its effective operational periods.

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Abbreviations

S/F :

Stress intensity factor

K I :

Stress intensity factor of crack mode I

K II :

Stress intensity factor of crack mode II

K III :

Stress intensity factor of crack mode III

a :

Crack length

D :

Total damage

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Acknowledgments

The authors gratefully acknowledge the financial support through National Natural Science Foundation of China (62103037) and Young Elite Scientists Sponsorship Program by CAST (2021QNRC001).

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Correspondence to Yi Yin.

Additional information

Hongyu Hu is a postgraduate student of School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, China. His research interests include fatigue, structural reliability and fracture mechanics

Yi Yin is an Associate Professor of the School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, China. Her research interests include fatigue, structural reliability of railway vehicles.

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Hu, H., Yin, Y., Wang, B. et al. Research on fatigue life and damage tolerance design of metro bogie frame. J Mech Sci Technol 38, 177–186 (2024). https://doi.org/10.1007/s12206-023-1215-x

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  • DOI: https://doi.org/10.1007/s12206-023-1215-x

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