Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux

Type de document

COMMUNICATION AVEC ACTES INTERNATIONAL (ACTI)

Langue

anglais

Auteur

COULONGEAT ; ANDERSON ; LONG ; SERRE

Résumé / Abstract

A good knowledge of the contact properties between the windscreen and the head during an impact is necessary to obtain a reliable pedestrian-vehicle crash simulation. Contrary to other parts of the vehicle, windscreen may not only be bent but also cracked during an impact. The purpose of this study is to analyse the behaviour of a head impact on a windscreen and to design a numerical model of windscreen which account for rate-dependent damping effect. Subsystem impact tests were used to measure the impact characteristics of the windscreen. Headform impactors were launched normal to windscreens at different velocities. Images from a very high speed video camera and acceleration data from the impactors were then recorded. The results of the subsystem tests were used to define contact-impact characteristics for the windscreen which correctly account for the damping effect. The characteristics were then implemented in a multibody model and the subsystem impact tests were simulated in order to validate it by comparison with experimental test. Two phases can be distinguished in the contact-impact characteristics. The first part corresponds to the bending and the fracture of the windscreen whereas the second part is associated to the bending of the windscreen once it is broken. The behaviour law of the windscreen has been implemented using a hysteresis model. The results from the numerical windscreen model are consistent with the results from the subsystem tests. Comparison of HIC values gives an additional validation of the consistency of our model. The numerical model needs to be corroborated with more impact tests on a greater variety of windscreens. Particularly, we could check if the numerical model is always consistent for a very low or a very high impact velocity. It could also be interesting to consider the possibility to adapt the models in function of the impact location. Windscreen; Contact properties; Pedestrian-vehicle crash; Multibody simulation

Editeur

Cranfield University ; University of the Méditerrannée ; INRETS