Vehicle bodies are designed and manufactured to provide the occupants with an adequate level of protection by maintaining the integrity of the passenger compartment, and assuring, at the same time, that the crash deceleration pulse stays below the biomechanical limits of the human tolerance. Therefore, the target of crashworthiness studies is an optimised vehicle structure with controlled deformation zones in order to maintain sufficient space inside the passenger cell. In particular, during a side crash, mainly the cross beam structures of the passenger compartment and also the high-strength beaded floor sheet plates can be utilised for supporting and energy absorption. This paper presents the improvement of lateral vehicle crashworthiness achieved by implementing a tube oriented design. A ring-shaped component, which is basically a circular cross-section extruded profile supporting the B-pillars, roof and floor, is designed and implemented in a numerical model of a typical sedan shaped vehicle. The numerical assessment of the proposed solution is performed according to the “Euro NCAP Side Impact Testing Protocol” using LS-Dyna explicit code and Madymo for occupant simulations. Comparative results are presented in terms of intrusions into the passenger cell and loads on the occupant dummy EuroSID-2. Relevant injury criteria are analysed and processed into the side impact score specified by the “Euro NCAP Assessment Protocol”. Furthermore, particular importance has to be attributed to weight reduction during the development phase because of the significant contribution of vehicle mass to driving resistance and emissions. Hence, lightweight materials are also implemented for the ring structure. The results obtained from the side impact simulations of the new developed solution are compared to the ones with the steel ring component.

Development of vehicle body components relevant for side impact and assessment of the achieved occupant safety / Ertugus, E.; Obradovic, Jovan; Belingardi, Giovanni. - (2012), pp. 185-203. ((Intervento presentato al convegno 12th International Stuttgart Symposium 2012, Automotive and Engine Technology tenutosi a Stuttgart nel 13 and 14 March 2012.

Development of vehicle body components relevant for side impact and assessment of the achieved occupant safety

OBRADOVIC, JOVAN;BELINGARDI, Giovanni
2012

Abstract

Vehicle bodies are designed and manufactured to provide the occupants with an adequate level of protection by maintaining the integrity of the passenger compartment, and assuring, at the same time, that the crash deceleration pulse stays below the biomechanical limits of the human tolerance. Therefore, the target of crashworthiness studies is an optimised vehicle structure with controlled deformation zones in order to maintain sufficient space inside the passenger cell. In particular, during a side crash, mainly the cross beam structures of the passenger compartment and also the high-strength beaded floor sheet plates can be utilised for supporting and energy absorption. This paper presents the improvement of lateral vehicle crashworthiness achieved by implementing a tube oriented design. A ring-shaped component, which is basically a circular cross-section extruded profile supporting the B-pillars, roof and floor, is designed and implemented in a numerical model of a typical sedan shaped vehicle. The numerical assessment of the proposed solution is performed according to the “Euro NCAP Side Impact Testing Protocol” using LS-Dyna explicit code and Madymo for occupant simulations. Comparative results are presented in terms of intrusions into the passenger cell and loads on the occupant dummy EuroSID-2. Relevant injury criteria are analysed and processed into the side impact score specified by the “Euro NCAP Assessment Protocol”. Furthermore, particular importance has to be attributed to weight reduction during the development phase because of the significant contribution of vehicle mass to driving resistance and emissions. Hence, lightweight materials are also implemented for the ring structure. The results obtained from the side impact simulations of the new developed solution are compared to the ones with the steel ring component.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11583/2497343
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