In this paper, fatigue life extension results from pre-existing surface defects in cast steel ASTM A148 90-60 of railway couplings, used in service in Portugal for coal transportation, are presented using two crack growth relationships (Paris equation and modified Paris equation). Fatigue lives were obtained and the results were discussed in terms of the threshold value for non-propagation cracks (modified Paris law) the initial value of the starting crack. It was found that for both crack growth relationships significant crack extension lives can be assumed. Therefore for these components and in this application damage tolerant procedure can be used with safety and this component can be kept in service provided appropriate inspection procedures are applied to detect and measure fatigue cracks. This will avoid early retirement from service of these components, since extension life can be assumed with safety.
| Published in |
International Journal of Mechanical Engineering and Applications (Volume 3, Issue 2-1)
This article belongs to the Special Issue Structural Integrity of Mechanical Components |
| DOI | 10.11648/j.ijmea.s.2015030201.11 |
| Page(s) | 1-6 |
| Creative Commons |
This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited. |
| Copyright |
Copyright © The Author(s), 2014. Published by Science Publishing Group |
Fatigue Crack Growth, Life Extension, Paris Law, Modified Paris Law, Railway Component
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APA Style
Morgado T. L. M. (2014). Fatigue Life Extension Study in Cast Steel Railway Couplings Used in Freight Trains. International Journal of Mechanical Engineering and Applications, 3(2-1), 1-6. https://doi.org/10.11648/j.ijmea.s.2015030201.11
ACS Style
Morgado T. L. M. Fatigue Life Extension Study in Cast Steel Railway Couplings Used in Freight Trains. Int. J. Mech. Eng. Appl. 2014, 3(2-1), 1-6. doi: 10.11648/j.ijmea.s.2015030201.11
AMA Style
Morgado T. L. M. Fatigue Life Extension Study in Cast Steel Railway Couplings Used in Freight Trains. Int J Mech Eng Appl. 2014;3(2-1):1-6. doi: 10.11648/j.ijmea.s.2015030201.11
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Download@article{10.11648/j.ijmea.s.2015030201.11,
author = {Morgado T. L. M.},
title = {Fatigue Life Extension Study in Cast Steel Railway Couplings Used in Freight Trains},
journal = {International Journal of Mechanical Engineering and Applications},
volume = {3},
number = {2-1},
pages = {1-6},
doi = {10.11648/j.ijmea.s.2015030201.11},
url = {https://doi.org/10.11648/j.ijmea.s.2015030201.11},
eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijmea.s.2015030201.11},
abstract = {In this paper, fatigue life extension results from pre-existing surface defects in cast steel ASTM A148 90-60 of railway couplings, used in service in Portugal for coal transportation, are presented using two crack growth relationships (Paris equation and modified Paris equation). Fatigue lives were obtained and the results were discussed in terms of the threshold value for non-propagation cracks (modified Paris law) the initial value of the starting crack. It was found that for both crack growth relationships significant crack extension lives can be assumed. Therefore for these components and in this application damage tolerant procedure can be used with safety and this component can be kept in service provided appropriate inspection procedures are applied to detect and measure fatigue cracks. This will avoid early retirement from service of these components, since extension life can be assumed with safety.},
year = {2014}
}
TY - JOUR T1 - Fatigue Life Extension Study in Cast Steel Railway Couplings Used in Freight Trains AU - Morgado T. L. M. Y1 - 2014/11/14 PY - 2014 N1 - https://doi.org/10.11648/j.ijmea.s.2015030201.11 DO - 10.11648/j.ijmea.s.2015030201.11 T2 - International Journal of Mechanical Engineering and Applications JF - International Journal of Mechanical Engineering and Applications JO - International Journal of Mechanical Engineering and Applications SP - 1 EP - 6 PB - Science Publishing Group SN - 2330-0248 UR - https://doi.org/10.11648/j.ijmea.s.2015030201.11 AB - In this paper, fatigue life extension results from pre-existing surface defects in cast steel ASTM A148 90-60 of railway couplings, used in service in Portugal for coal transportation, are presented using two crack growth relationships (Paris equation and modified Paris equation). Fatigue lives were obtained and the results were discussed in terms of the threshold value for non-propagation cracks (modified Paris law) the initial value of the starting crack. It was found that for both crack growth relationships significant crack extension lives can be assumed. Therefore for these components and in this application damage tolerant procedure can be used with safety and this component can be kept in service provided appropriate inspection procedures are applied to detect and measure fatigue cracks. This will avoid early retirement from service of these components, since extension life can be assumed with safety. VL - 3 IS - 2-1 ER -
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