A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
MODELING AND SIMULATION OF RAIL END BOLT HOLE AND BOLTED RAIL JOINT BY FEM
Among the multiple mechanical parts of the rail supper structure, there are components subjected to failure due to unbalanced load, impact load, stress concentration, fatigue load on the structure. Rail end joint is the weakest component, in addition to exposing for the above factors mainly due to the discontinuity of the structure's mechanical properties and geometries. Recent studies shows that the most widespread defect occurs on the bolt-hole and in the upper fillet area of the rail end. Therefore, the rail end joint is susceptible to failure due to various factors. This study is performed to model and simulate bolted rail joint by using finite element method to understand the influence of both static and dynamic loading conditions on bolted rail end joint safe operation. Beside this, research addresses the effects of support condition, missed-bolt settings, moving wheel and loading position on the bolted rail end joint:- vertical deflection, stress distribution at the bolt hole and the upper fillet in both loading conditions. Results of static load shows that when loading position varies rail end joint responses significantly varies. Missed bolts, are the most sensitive in terms of varying the stresses at bolt-hole and von-Misses stress at joint upper fillet of the joint. Whereas the result of dynamic loading shows that the contact stress at the wheel-rail interface wouldn’t significantly affected with varying train operating velocity, but varying of bolt conditions heavily upset the rail end joint responses. Hence, the center supported joint and tight bolt is strongly suggested because of its high stiffness may cause smaller deflection and smaller bolt-hole stress around the rail end joint that can reduce failure before service time of the joint. The analysis using static and dynamic vertical wheel loads is not enough to fully describe the phenomena occurring around the rail end joint and bolt-hole areas, it needs further work on effluence of dynamic load condition at the joint bar, bolt and nut of the rail end joint.
MODELING AND SIMULATION OF RAIL END BOLT HOLE AND BOLTED RAIL JOINT BY FEM
Among the multiple mechanical parts of the rail supper structure, there are components subjected to failure due to unbalanced load, impact load, stress concentration, fatigue load on the structure. Rail end joint is the weakest component, in addition to exposing for the above factors mainly due to the discontinuity of the structure's mechanical properties and geometries. Recent studies shows that the most widespread defect occurs on the bolt-hole and in the upper fillet area of the rail end. Therefore, the rail end joint is susceptible to failure due to various factors. This study is performed to model and simulate bolted rail joint by using finite element method to understand the influence of both static and dynamic loading conditions on bolted rail end joint safe operation. Beside this, research addresses the effects of support condition, missed-bolt settings, moving wheel and loading position on the bolted rail end joint:- vertical deflection, stress distribution at the bolt hole and the upper fillet in both loading conditions. Results of static load shows that when loading position varies rail end joint responses significantly varies. Missed bolts, are the most sensitive in terms of varying the stresses at bolt-hole and von-Misses stress at joint upper fillet of the joint. Whereas the result of dynamic loading shows that the contact stress at the wheel-rail interface wouldn’t significantly affected with varying train operating velocity, but varying of bolt conditions heavily upset the rail end joint responses. Hence, the center supported joint and tight bolt is strongly suggested because of its high stiffness may cause smaller deflection and smaller bolt-hole stress around the rail end joint that can reduce failure before service time of the joint. The analysis using static and dynamic vertical wheel loads is not enough to fully describe the phenomena occurring around the rail end joint and bolt-hole areas, it needs further work on effluence of dynamic load condition at the joint bar, bolt and nut of the rail end joint.
MODELING AND SIMULATION OF RAIL END BOLT HOLE AND BOLTED RAIL JOINT BY FEM
AMBERBIR WONDIMU (author)
2019-09-18
doi:10.20372/nadre/4121
Theses
Electronic Resource
English
DDC:
690
Finite Element Analysis of the Effects of Bolt Condition on Bolted Rail Joint Stresses
| British Library Online Contents | 2016