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Keywords: high-speed train bogie, fatigue life assessment, mean stress effect, constant life diagram, in-service monitoring.

Summary

The stress-life (S-N) approach is often used for fatigue life assessment of railway bogie components. It derives the stress ranges and mean stresses from cyclic strain/stress responses experienced by bogie parts generating from repeated loadings for purpose of fatigue assessment. Mean stresses in the stress responses affect the fatigue life of bogie components. Previous research has proposed several algorithms denoted "constant life diagrams" to account for the mean stress effect in the stress spectra. In this paper, the influence of mean stress on the fatigue life of high-speed train bogies is identified and examined using one-month strain monitoring data acquired during a passenger train running on a high-speed railway in China. Firstly, a method of fatigue life assessment capable of considering mean stress effect is introduced for processing the in-service monitoring data. It defines a new parameter Q based on the constant life diagrams to take into account the influence of mean stress on fatigue life. Secondly, in-service mean stresses as well as stress ranges are identified from the strain time history measured during each of the train trips. For the purpose of fatigue life assessment, the spectra of stress range, distribution of mean stress and associated Q are derived and their characteristics are examined and interpreted with statistical techniques. Finally, the distribution of the parameter Q confirms the negative influence of in-service mean stress on fatigue life. Based on the findings, an optimal process to consider stress range and mean stress for fatigue life assessment of high-speed train bogies is provided.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 110 PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 222 Analysis of the Influence of Mean Stress on the Fatigue Life of In-Service High-Speed Train Bogies using Monitoring Data X. Wang¹ and Y.Q. Ni^1,2 ¹Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong ²Hong Kong Branch of National Rail Transit Electrification and Automation, Engineering Technology Research Centre, Hung Hom, Kowloon, Hong Kong doi:10.4203/ccp.110.222 purchase the full-text of this paper Full Bibliographic Reference for this paper X. Wang, Y.Q. Ni, "Analysis of the Influence of Mean Stress on the Fatigue Life of In-Service High-Speed Train Bogies using Monitoring Data", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 222, 2016. doi:10.4203/ccp.110.222 Keywords: high-speed train bogie, fatigue life assessment, mean stress effect, constant life diagram, in-service monitoring. Summary The stress-life (S-N) approach is often used for fatigue life assessment of railway bogie components. It derives the stress ranges and mean stresses from cyclic strain/stress responses experienced by bogie parts generating from repeated loadings for purpose of fatigue assessment. Mean stresses in the stress responses affect the fatigue life of bogie components. Previous research has proposed several algorithms denoted "constant life diagrams" to account for the mean stress effect in the stress spectra. In this paper, the influence of mean stress on the fatigue life of high-speed train bogies is identified and examined using one-month strain monitoring data acquired during a passenger train running on a high-speed railway in China. Firstly, a method of fatigue life assessment capable of considering mean stress effect is introduced for processing the in-service monitoring data. It defines a new parameter Q based on the constant life diagrams to take into account the influence of mean stress on fatigue life. Secondly, in-service mean stresses as well as stress ranges are identified from the strain time history measured during each of the train trips. For the purpose of fatigue life assessment, the spectra of stress range, distribution of mean stress and associated Q are derived and their characteristics are examined and interpreted with statistical techniques. Finally, the distribution of the parameter Q confirms the negative influence of in-service mean stress on fatigue life. Based on the findings, an optimal process to consider stress range and mean stress for fatigue life assessment of high-speed train bogies is provided. purchase the full-text of this paper (price £22) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £85 +P&P)
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