Effect of Vehicle Bumper Shape Design on the Severity of Pedestrian Leg Injury at Collision

Abstract

Cars bumper an important part to protecting the front of the vehicle at slow speed, and was formerly used chrome-plated steel. Steel material is too stiff to pedestrian protection and lack amenability to absorb energy. Designers began looking for alternative bumper designs and materials to achieved two requirements protect the vehicle at slow speed and pedestrian at collision together. For designing a pedestrian friendly bumper and to quantify expected injury level in a pedestrian lower leg at car - pedestrian collisions must generating a legform impactor model and validating the performance of this model by following a regulation in this filed. This simulation work focuses at design of friendly pedestrian bumper to reducing the proportion of pedestrian lower leg injury at collision through design a bumper shape. legform impactor model is generated according to the European Enhanced Vehiclesafety Committee EEVC/WG17 regulation data for tests and validation. The mechanism of collision between the legform impactor model and vehicle bumper have been investigated numerically and analyzing by using LS-DYNA software. To study the effect of bumper shape at the severity of pedestrian leg injury is used four different concept bumper shape that has been designed for this purpose