HE Dong1,2， YANG Li ming1， LIU Jun1， XIE Shu gang2， FANG Rui2

 

（1.Faculty of Mechanical Engineering and Mechanics，NingBo University，Ningbo 315211，China；

 

2.China Automobile Technology and Research Center，Tianjin 300300，China）

 

 

Abstract: Aiming at car frontal energy absorption structure and flexible legs collision damage, structures and materials of car frontal energy absorbing components were studied. Finite element model of a sedan, as well as foam energy absorption structure and thin wall steel energy structure were established, by using the computer aided engineering (CAE) technique. Collision experiments were developed by car frontal components and flexible legs, with two kinds of energy absorption structure adopted by automobile front end, and the energy absorption space was changed. Characteristics of collision of two different energy absorption structures were analyzed and compared by experimental data with Flex PLI. The results indicate that car frontal energy absorption structures use foam, thickness of the foam are reduced, which are beneficial to reduce ligaments elongations of the Flex_ PLI. And thin walled steel are used as energy absorption structures, which enough energy absorption space can adjust the movement attitude of the legform ,and reduce ligaments elongations as well as tibia bending moment of the Flex_ PLI. The thin walled steel stiffness is uniformity with crumple characteristics, when a collision, pedestrians legs can be better protected.

 

Key words: automotive safety; pedestrian protection; flexible pedestrian legform (Flex PLI); energy absorption structure; CAE