基于汽车与行人碰撞载荷特点的下肢长骨建模

DEVELOPMENT AND VALIDATION OF FE MODELS FOR LONG BONES OF LOWER LIMB IN VEHICLE-TO-PEDESTRIAN CRASHES

基于THUMS(total human model for safety)下肢长骨有限元模型,在材料和单元属性等方面进行了改进.在详细分析行人下肢长骨载荷特点的基础上,采用多种不同载荷工况下较新的生物力学实验数据,对长骨模型进行了前-后和外-内加载方向的准静态三点弯曲验证,同时对近心端1/3处、中部和远心端1/3处加载的动态三点弯曲验证.验证结果表明,该模型具有较好的生物逼真度,能够准确地模拟行人下肢长骨的骨折及碰撞响应,可用于后续行人下肢模型的开发,并为行人下肢损伤机理和安全防护研究提供准确高效的研究手段.

FE models are used widely in the pedestrian safety, which has become a very important topic Based on THUMS model, FE models of femur, tibia and fibula were improved on materials, element properties, and so on. Based on the analysis of loading characteristics of lower limb long bones on pedestrian in vehicle-topedestrian crashes, the FE models of long bones were fully validated against experimental results as follows： （1） quasi-static 3-point bending tests of femur, tibia, and fibula with A-P and L-M loading directions, （2） dynamic 3- point bending tests of femur, tibia, and fibula with different impact locations of proximal 1/3, middle diaphysis, and distal 1/3. The simulation results demonstrate that the improved models have high biofidelity to accurately simulate fractures and ,collision responses. They can be used for further development of the pedestrian lower limb. Simultaneously, they also provide a useful research technique to investigate injury mechanisms and assess the protective performance of the vehicle-front structures.