10岁儿童头部有限元模型的建立及验证

发布时间：2019-08-06 06:40

【摘要】：运用ANSYS ICEM CFD以及HYPERMESH软件对10岁儿童头部几何模型进行合理的网格划分,获得具有高度解剖学细节的10岁儿童头部有限元模型。利用MADYMO软件自带的假人,模拟一起典型跌落事故中,受伤儿童从3个不同高度跌落时人体的动力学响应过程,并计算头部与地面碰撞接触瞬间的方位和速度等运动学参数。然后将这些参数输入到10岁儿童头部有限元模型中,模拟头部与地面的碰撞过程,并分析与损伤相关的生物力学参数。结果表明,颅骨的最大应力和最大应变分布在枕骨右侧,与碰撞点的位置较为吻合,但均未超过颅骨的耐受极限。利用颅内压力可较好地预测脑组织的损伤程度,而利用脑组织的von-mises应力可较好地判断脑组织的损伤位置。事故重建的结果表明,该模型具有较好的生物逼真度,可以用于儿童头部损伤生物力学的研究。
[Abstract]:ANSYS ICEM CFD and HYPERMESH software were used to divide the geometric model of the head of 10-year-old children reasonably, and the finite element model of the head of 10-year-old children with high anatomical details was obtained. In a typical fall accident, the dynamic response process of injured children falling from three different heights was simulated by using the dummy brought with MADYMO software, and the kinematic parameters such as azimuth and velocity at the moment of contact between the head and the ground were calculated. Then these parameters are input into the finite element model of the head of 10-year-old children to simulate the collision process between the head and the ground, and the biomechanical parameters related to the injury are analyzed. The results showed that the maximum stress and strain of the skull were distributed on the right side of the occipital bone, which were consistent with the position of the collision point, but did not exceed the tolerance limit of the skull. Intracranial pressure can be used to predict the injury degree of brain tissue, and von-mises stress of brain tissue can be used to judge the location of brain tissue injury. The results of accident reconstruction show that the model has good biological fidelity and can be used in the biomechanical study of head injury in children.
【作者单位】：湖南大学汽车车身先进设计制造国家重点实验室;
【基金】：国家自然科学基金(11172099)
【分类号】：R318.01

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