中文摘要：

在某文献建立的头部碰撞损伤有限元模型的基础上,增加颅骨和脑组织之间的脑脊液层,采用表面流体建模方法模拟其静液压流体腔,赋予头部各组织黏弹性材料特性,建立了改进模型,并与基准模型进行对比仿真。结果表明,修正后的改进模型具有较好的生物逼真度,在汽车碰撞事故模拟中有更好的压力响应,与修正前的基准模型相比,颅骨最大主应力增加了44%,主要与脑组织材料特性的改变有关;脑组织的最大von Mises应力增加了18%,主要与脑脊液材料特性的改变有关。通过与另一文献实验结果的对比,验证了研究结果的正确性。

英文摘要：

On the basis of the head injury finite element model published in an article,a modified model is built by adding a cerebrospinal fluid layer between skull and brain tissues,simulating its hydrostatic fluid chamber with surface fluid modeling method,and defining viscoelastic material characteristics for all brain tissues. Then the modified model and original base model are comparatively simulated. The results show that the modified model has better biofidelity and pressure response in vehicle crash accident simulation. Compared with the stresses in base model,the peak principal stress in the skull increases by 44% mainly due to the change in the material characteristics of brain tissue; and the peak von Mises stress in brain tissues increasing by 18% due mainly to the change in the material characteristics of cerebrospinal fluid. The experiment results in another paper verify the correctness of the study.