The following elaboration is based on the long welded rail, in particular the analysis of the phenomenon of the alignment caused by the thermal expansion that the rails undergo by an increase in temperature during the hottest months of the year. Through the simulation software SIMULIA ABAQUS 6.14 a detailed analysis will be carried out on the finite elements of the instability phenomenon of the track subject to thermal increase through the realization of a 3D model of railway superstructure made of long welded UIC type 60 tracks, a system of indirect connection K and rails of the RFI-260 type (these elements have been realized respecting the real physical and geometrical characteristics). Subsequently, three different analyzes were carried out using three models of long welded rail having lengths of 250 m, 500 m and 1 km respectively and assuming a temperature increase of 35 ° C. In all the analyzes the phenomenon of the slinning was obtained, with different results both in terms of deformation and branching along the rails and identifying the temperature at which this phenomenon manifests itself.
Il seguente elaborato ha per argomento la lunga rotaia saldata, in particolare l’analisi del fenomeno dello slineamento causato dall’espansione termica che le rotaie subiscono ad opera di un incremento di temperatura nei mesi più caldi dell’anno. Attraverso il software di simulazione SIMULIA ABAQUS 6.14 verrà svolta un’analisi dettagliata agli elementi finiti del fenomeno di instabilità del binario soggetto ad incremento termico mediante la realizzazione di un modello 3D di sovrastruttura ferroviaria realizzata con lunghe rotaie saldate di tipo UIC 60, un sistema di attacco indiretto K e traverse di tipo RFI-260 (tali elementi sono stati realizzati rispettando le caratteristiche fisiche e geometriche reali). Successivamente sono state condotte tre differenti analisi utilizzando tre modelli di lunga rotaia saldata aventi lunghezze rispettivamente di 250m, 500 m e 1 km ed ipotizzando un incremento di temperatura pari a 35 °C. In tutte le analisi si è ottenuto il fenomeno dello slineamento, con differenti risultati sia in termini di deformazione che di diramazione lungo le rotaie e identificando la temperatura alla quale tale fenomeno si manifesta.
Modellazione sperimentale ed analisi agli elementi finiti (FEM) della lunga rotaia saldata soggetta ad incremento termico
GRIGOLO, GABRIELE
2018/2019
Abstract
The following elaboration is based on the long welded rail, in particular the analysis of the phenomenon of the alignment caused by the thermal expansion that the rails undergo by an increase in temperature during the hottest months of the year. Through the simulation software SIMULIA ABAQUS 6.14 a detailed analysis will be carried out on the finite elements of the instability phenomenon of the track subject to thermal increase through the realization of a 3D model of railway superstructure made of long welded UIC type 60 tracks, a system of indirect connection K and rails of the RFI-260 type (these elements have been realized respecting the real physical and geometrical characteristics). Subsequently, three different analyzes were carried out using three models of long welded rail having lengths of 250 m, 500 m and 1 km respectively and assuming a temperature increase of 35 ° C. In all the analyzes the phenomenon of the slinning was obtained, with different results both in terms of deformation and branching along the rails and identifying the temperature at which this phenomenon manifests itself.File | Dimensione | Formato | |
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https://hdl.handle.net/10589/144255