爆炸冲击波对肺损伤的数值模拟

摘要

采用数值模拟方法,分析了人体胸部在自由空间爆炸场中受冲击波作用的力学过程.利用Mimics软件对CT图像进行处理,建立人体胸部三维模型.根据人体胸部各生物组织的特性,选择合理的材料模型和参数,并利用LS-DYNA有限元程序中流固耦合方法,计算分析冲击波作用于人体胸部肺的受力过程.通过计算获得冲击波入射超压峰值和正压持续时间,参照Bowen损伤曲线评估出肺处于Dc与Dl损伤状态之间.观察肺部应力变化过程,获得肺部表面的正应力变化规律和损伤最严重的区域.分析剪切应力变化规律,了解肺受切应力作用损伤的可能性.%Based on numerical simulation, the dynamic response of human chest encountering shock in free blast field is investigated. CT Images are treated using the software of Mimics, and the 3-D model of human chest is established. According to the characteristics of each biologic tissue in human chest, the model and parameters of the material is rightly selected. Using fluid-structure coupling finite element solver of LS-DYNA software, the dynamic response of the lungs under a blast wave is calculated and analyzed. By the calculated peak overpressure and positive phase duration of incident shock wave, between Dc and D injury level of the lungs is evaluated referring to Bowen's curve. Observing changes of pressure inside the lungs, the stress variation on the lung surface and the most severely damaged area are obtained. The shear stress is analyzed, and possibility of damage caused by shear stress is understood.