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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。
Based on the finite element model of head crash injury established in a certain literature, the cerebrospinal fluid (CSF) layer between skull and brain tissue was increased. The surface fluid modeling method was used to simulate the hydrostatic fluid cavity, Established an improved model, and compared with the benchmark model simulation. The results show that the modified model has a better biological fidelity and a better pressure response in the simulation of a car crash. Compared with the baseline model before correction, the maximum principal stress of the skull increased by 44% Changes in tissue material properties; the maximum von Mises stress in brain tissue increased by 18%, mainly related to changes in cerebrospinal fluid material properties. By comparing with the experimental results of another literature, the correctness of the research results is verified.