摘要
目的构建第95百分位中国人头部有限元模型,分别参照4种不同类型的颅脑相对位移试验对其进行有效性验证,并评估颅骨与脑组织之间的相对位移,同时探讨脑组织的剪应变分布。方法比较试验与仿真中的颅脑相对位移曲线,并结合动物试验和物理试验中所得出的结论,探讨较高剪应变出现的位置。结果仿真所得的颅脑相对位移曲线与试验结果基本吻合,由于脑组织总是恢复到初始状态,曲线总是出现波峰和波谷。较高剪应变出现在大脑颞叶、胼胝体和脑表面的位置,与动物试验和物理试验中所得出的结论较为相符。结论第95百分位中国人头部有限元模型具有良好的生物仿真度。由于头部的旋转运动,脑表面和脑组织深处都会出现较高的剪应变,从而导致损伤,故本文的研究结果为开展在交通事故中头部损伤机理的研究提供了科学的理论依据。
Objective To construct and validate the 95th percentile finite element model of Chinese human head,evaluate the relative displacement between the skull and brain according to four types of skull-brain relative displacement experiments as references,and investigate the shear strain distributions on the brain.Methods By comparing the relative displacement curve derived from the experiment and simulation and referring to conclusions from animal and physical experiments,the position of higher shear strain was investigated.Results High correlations could be found between the simulated and experimental results for skull-brain relative displacement.Peaks and troughs could always appear in curves of skull-brain relative displacement due to the fact that the brain tissue tended to return to its initial state.The results that higher strain could occur at temporal lobe of the brain,corpus callosum and brain surface were consistent with conclusions from the animal and physical experiments.Conclusions The 95th percentile finite element model of Chinese human head is validated with good biofidelity.Due to the rotational motion of human head,higher shear strain will occur on brain surface and in deep brain,leading to injuries,which provids a scientific theoretical basis for the study on injury mechanism of human head in traffic accidents.
出处
《医用生物力学》
EI
CAS
CSCD
北大核心
2012年第2期198-206,共9页
Journal of Medical Biomechanics
关键词
第95百分位
有限元分析
颅脑相对位移
剪应变
损伤
95th percentile
Finite element analysis
Skull-brain relative displacement
Shear strain
Injury
