Estudo do desempenho de reforços poliméricos em estruturas veiculares submetidas a impacto. / Study of polimeric reinforcements in vehicular structures subjected to impacts.

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

25/03/2010

RESUMO

The objective of this work is to show the application of structural reinforcements using the polymeric material PA66 through finite element simulations in the field of vehicle safety. The preformed structural reinforcements have shown good performance in crash tests, where the great advantage is their reduced weight. These reinforcements are designed with the aim of increasing the rigidity of regions which are prone to large deformations, stabilizing sections of the vehicle that works as load path during the impact. Initially, static and dynamic tests were performed to characterize the material PA66, which was used in the simulations. The impact cases studied were those which will be adopted by CONTRAN in 2012 and already adopted by other standards of great importance for the occupant safety, such as ECE-R94, ECE-R12, ECE-R95, ECE-R32/34 and FMVSS216. The simulations performed in the software LS-Dyna ® and MADYMO ® considering the application of reinforcements in the case of frontal impact regarding ODB at 57km/h configuration, resulted in 70% reduction in the A pillar deformation and 65% in the deformation of the steering column and a reduction of approximately 59% in the occupant\ s legs and feet region. The occupant\ s injury level were assessed by MADYMO ® software, and a reduction of 23.5% in the chest compression and 80% in the tibia compression were verified. Such conditions lead the safety of an occupant of the vehicle with reinforcements in a collision event according to the standard. The application of reinforcements on side impact load case contributed to reduce the B pillar velocity at the dummy\ s ribs region from 13.8 m/s to 10.6 m/s and there was a gain of 140mm of B pillar residual space. Reinforcements adopted for the front and side impact load cases provided an increase of 47.5% in the upper structure crush force, according to FMVSS216 standard.

ASSUNTO(S)

finite element method impactos veiculares método dos elementos finitos polymer reinforcements reforços estruturais veiculares reforços poliméricos simulação de proteção ao ocupante simulation of occupant protection vehicular impact vehicular structural reinforcements

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