Fatigue Wear Analysis and Life Prediction of Rail Under Dry and Lubricated Wheel/Rail Contact Conditions
| dc.contributor.advisor | Habtamu, Tkubet (Mr.) | |
| dc.contributor.author | Tsion, Goa | |
| dc.date.accessioned | 2019-01-14T12:46:49Z | |
| dc.date.accessioned | 2023-11-04T15:18:19Z | |
| dc.date.available | 2019-01-14T12:46:49Z | |
| dc.date.available | 2023-11-04T15:18:19Z | |
| dc.date.issued | 2017-06 | |
| dc.description.abstract | The rail is subjected to high contact stress of alternating magnitude due to wheel-rail frictional rolling contact. Due to this the rail is prone to fatigue damage. This thesis paper addresses the fatigue problem by developing the contact between wheel and rail and predicting the fatigue life of the rail under dry and lubricated contact. Different values of friction coefficients are selected to model the dry (µ=0.6) and lubricated (µ=0.2 and µ=0.05) wheel/rail contact conditions in this study. The main objective of this is to study the effects of these varying friction coefficients on the fatigue life of the rail, so that better maintenance schedule can be implemented to increase the life of the rail. Analytical and numerical approaches are implemented in this thesis. The analytical approach investigates the Normal contact problem and tangential contact problem at the wheel/rail contact using the Hertz normal contact theory, Polach‟s tangential theories respectively. The numerical approach is based on the static structural analysis of the wheel/rail contact using ANSYS 15.0 commercial software. Three dimensional finite element method is utilized to investigate the effect of friction on the wheel/rail contact stress and the fatigue life of the rail. The fatigue life analysis is done using stress-life analyses approach. From the results found it can be seen that the fatigue life of the rail induced under dry wheel/rail contact conditions is minimum compared to the lubricated contact conditions. The fatigue life (in terms of cycles to failure) is 3689.4 cycles under dry contact, and 37834 cycles under water lubricated and 1.08e5 cycles under grease lubricated conditions. And the damage of the rail is higher under dry contact condition compared to lubricated contact conditions. This thesis is applicable for the Addis Ababa light rail operating system, in protecting the rail from fatigue failure. Managing the friction coefficient on the rail is recommended on the results. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/123456789/15699 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | lubricated wheel/rail | en_US |
| dc.subject | Fatigue wear | en_US |
| dc.subject | dry wheel/rail contact | en_US |
| dc.title | Fatigue Wear Analysis and Life Prediction of Rail Under Dry and Lubricated Wheel/Rail Contact Conditions | en_US |
| dc.type | Thesis | en_US |