MODELING OF LIGHTWEIGHT CRASHWORTHY RAIL COMPONENTS

Grasso, Marzio (2009) MODELING OF LIGHTWEIGHT CRASHWORTHY RAIL COMPONENTS. [Tesi di dottorato] (Inedito)

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Abstract

As part of a research collaboration between the Department of Mechanics and Energetics of the University of Naples Federico II (IT) and NewRail Newcastle University Centre for Railway Research (UK) has been conducted a study on the applicability of composite materials for the crashworthiness design of a train cab. The preliminary phase of work has involved the study of issues related to railway accidents and safety standards for passengers imposed by European Standards. In the next phase, we addressed the problem of redesigning the structure of an existing cab in order to reach a solution that, at the same performance, is able to increase the payload and decrease manufacturing and maintenance costs.. For this purpose, composite materials, metallic and non, has been chosen with few traditional metallic material to create virtual structures, since they are very performance and characterize by very high specific absorption energy. After a thorough comparative analysis of the characteristics of strength, energy absorption capability and applicability to a particular component of the many materials tested, it has been selected those more suitable for this purpose: mild steel, GRP, balsa wood and rigid polyurethane foam wrapped in FRP. For components made by these materials, except those made by the balsa wood, tests of mechanical characterization, needed to be able to model the correct behaviour before moving on to the stage of numerical simulations, were conducted. It has followed a consistent simulation activities with the finite element code LS-DYNA ®, to reproduce, on the individual components in each design, the impact conditions prescribed by the regulations EN15227, and, on the whole structure, the load conditions prescribed by EN12663. It has been possible to define the solution that better respond to the specified requirements, by comparing the behavioral responses of the different solutions hypothesized. The next work will consist in verifying, by static and dynamic tests on full scale prototypes of the optimized structures, the compliance between numerical and experimental results.

Tipologia di documento:Tesi di dottorato
Parole chiave:CRASHWORTHINESS, LIGHTWEIGHTING, RAILWAY, DRIVER’S CAB, COMPOSITE MATERIALS
Settori scientifico-disciplinari MIUR:Area 09 Ingegneria industriale e dell'informazione > ING-IND/14 PROGETTAZIONE MECCANICA E COSTRUZIONE DI MACCHINE
Coordinatori della Scuola di dottorato:
Coordinatore del Corso di dottoratoe-mail (se nota)
Acierno, Domenicodomenico.acierno@unina.it
Tutor della Scuola di dottorato:
Tutor del Corso di dottoratoe-mail (se nota)
De Iorio, Antonioantonio.deiorio@unina.it
Stato del full text:Inedito
Data:30 Novembre 2009
Numero di pagine:136
Istituzione:Università degli Studi di Napoli Federico II
Dipartimento o Struttura:Ingegneria dei Materiali e della Produzione
Tipo di tesi:Dottorato
Stato dell'Eprint:Inedito
Scuola di dottorato:Ingegneria industriale
Denominazione del dottorato:Ingegneria dei Materiali e delle Strutture
Ciclo di dottorato:XXII
Numero di sistema:3860
Depositato il:20 Maggio 2010 16:54
Ultima modifica:20 Maggio 2010 16:54

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