准静态下颞部撞击致颅脑伤的有限元模拟分析及其临床意义

目的建立准静态下颞部撞击致颅脑伤的虚拟模型，研究准静态下颞部撞击所致的应力分布以及应力波的传播，探讨颞部撞击致颅脑伤的生物力学机制。方法在Hypermesh软件中建立准静态颞部撞击伤的有限元模型，用Ls-Dyna软件对该有限元模型进行数值模拟计算，最后用Ls-Prepost软件进行后处理。结果撞击点处颞骨VonMises应力以及颅内压力随撞击速度的提高而增大；应力波在颅骨表面的传播以撞击点为圆心的径向上传播，在颅骨一脑组织耦合处急剧衰减；颅底有应力集中区域。该数值模拟的结果与生物试验结果较吻合。结论本研究对颞部撞击致颅脑损伤的诊断和防护有重要意义。

Finite-element simulation analysis of brain injury from temporal impact in quasi-static and its clinical significance

Objective To study the stress distribution and stress wave propagation in skull and brain by establishing the virtual model of brain injury from temporal impact in quasi-static so as to investigate the mechanisms of biomechanics of brain injury. Methods The finite element model of brain injury from temporal impact in quasi- static was built with Hypermesh software. The simulation and postprocessing of temporal impact were done using Ls- Dyna and Ls-Prepost software. Results The Von Mises stress of impacted temporal bone and intracranial pressure were improved with the increase of impact velocity. Stress wave was propagated along the radial with the center of circle of impacted area and attenuated deeply between skull and brain. Stress concentration was observed on fundus cranii. The result of simulation was concerned with the bio-impact experiment. Conclusion This study can play more important role in diagnosis and prevention of brain injury from temporal impact.