Comparison of different numerical calculation methods of stress factor for welded joints of metro bogie frame
Stress factor is an important parameter defined in EN 15085-3 standard. In order to obtain reliable stress factor calculation results, according to the fatigue load cases provided in EN 13749, the stress factors of key joints in typical frame were calculated and compared based on Goodman-Smith fatig...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Department of Electric Drive for Locomotives
2022-07-01
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| Series: | 机车电传动 |
| Subjects: | |
| Online Access: | http://edl.csrzic.com/thesisDetails#10.13890/j.issn.1000-128X.2022.04.018 |
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| Summary: | Stress factor is an important parameter defined in EN 15085-3 standard. In order to obtain reliable stress factor calculation results, according to the fatigue load cases provided in EN 13749, the stress factors of key joints in typical frame were calculated and compared based on Goodman-Smith fatigue limit line diagram and master S-N curve method respectively. For the fatigue limit method, taking a pipe joint as an example, according to the comparison of different stress extraction methods, it was proved that the stress at the weld toe obtained by interpolation linear extrapolation was more conservative. For the master S-N curve method, the equivalent calculation formula of stress factor using cumulative damage was deduced. The calculation results of the stress factor of the welded joints of the actual frame showed that due to the different calculation methods of the stress factor and the basic data of anti-fatigue design used under static and dynamic load cases, the maximum value and position of the stress factor of the same weld in the structure may be quite different. Therefore, when applying EN 15085-3 standard, the calculation of stress factor should refer to the calculation results of two load cases at the same time, so as to more reasonably determine the weld quality and inspection class. In addition, the analysis showed that the stress factor calculation based on S-N curve method could also consider the fatigue damage contribution of multiple load cases and reflect the influence of the change of load cycles and the improvement effect of weld toe. Therefore, the calculation result is more reliable and the application is more flexible. |
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| ISSN: | 1000-128X |