Numerical Model Development Of Lower Legform Impactor Based On The Pedestrian Protection

With the economic development in recent years, the world possessing capacity of vehicle increases, and it leads to the increasing vehicle safety accidents. Pedestrians become the most vulnerable groups in the vehicle accident for the lack of protection. The pedestrian safety causes the great attention in every country and region in recent years, corresponding laws and regulations are improved gradually. Furthermore, the national standard of china- "the protection of motor vehicle for pedestrians in the event of a collision" has been issued in 2009. However, the lower leg easily suffered from injuries in the accidents, so the leg collision is a research focus on the protection of pedestrian safety. Hence the finite element model of leg, which can simulate the collision analysis, is the key in the crash simulation. Based on above goals and relevant research before, a preliminary numerical model of legform impactor is developed.Based on the literature at home and abroad and previous work experience, the legform impactor required by Chinese national standard and EEVC pedestrian protection regulation respectively is analyzed firstly. Then the rigid leg can be divided into skin, muscle, tibia and femur, which are analyzed respectively. Moreover, the requirements of the mass, the center of mass and the mass moment of inertia of the femur and tibia can be obtained. After simplification and parameterization of the femur and tibia, using above obtained parameters as the target, the parameters of tibial and femoral parts are obtained by Matlab. In addition, the legform impactor model is developed by 3D software, and it meets the requirements of the geometric parameter.The legform impactor model is simulated through the finite element method. According to the requirements of the Chinese national standard and EEVC pedestrian protection regulation, the finite element model is validated by simulating the static bending test, static shearing test and dynamic impact test in finite element software LS-DYNA. After the simulation, this leg impactor numerical model meets the regulation requirement of mechanical property. In this paper, a rigid legform impactor has been designed and verified, this will gain experience for developing a more realistic flexible legform impactor later, and it is also the preparation for the optimal design of the bumper.