爆炸冲击波作用下胸壁动态响应与肺部损伤的关系

Relationship between dynamic response of chest wall and lung injury under blast shock wave

目的 获得不同爆炸冲击波作用下兔肺部损伤度和胸壁变形速度,分析胸壁变形速度与肺部损伤度之间的函数关系。方法 开展兔冲击伤实验,获得等效90 g TNT炸药爆炸条件下0.5、0.6、0.7、0.9、1.0、1.2 m爆炸距离处兔肺部伤情;建立兔胸部有限元计算模型,对实验工况进行数值模拟,获得胸壁变形速度;通过数据拟合,建立兔胸壁变形速度与肺部损伤度之间的关系。结果 0.5、0.6 m处的兔当场死亡,胸壁变形速度分别为2.10、1.46 m/s;0.7 m处的兔中度损伤,胸壁变形速度为1.10 m/s;0.9、1.0、1.2 m处的兔轻伤,胸壁变形速度分别为0.64、0.51、0.35 m/s。兔肺部损伤度与胸壁变形速度之间的关系为Ф=0.3192 ·V^3.0119 。结论 胸壁变形速度与肺部损伤度有明显的相关性,可以用来预测爆炸冲击波作用下肺部损伤伤情。

Objective The study aims to obtain the rabbit lung injury and the deformation of chest wall under different blast shock waves and analyze the relationship between the lung injury and the deformation of chest wall. Methods The shock injury experiment on rabbit is carried out to obtain the lung injury under shock wave induced by 90 g TNT exploded at explosion distances of 0. 5 m,0. 6 m,0. 7 m,0. 9 m,1. 0 m and 1. 2 m. The finite element computational model of rabbit thorax is established and the deformation velocity of chest wall is obtained by simulating the shock injury at same conditions. The relationship between the deformation velocity of chest wall and the lung injury is established by data fitting. Results The rabbit died at the explosion distance of 0. 5 m and0. 6 m,and the corresponding deformation velocity of chest wall are 2. 10 m/s and 1. 46 m/s,respectively. It is seriously injured at 0. 7 m and the velocity is 1. 10 m/s. It is slightly injured at 0. 9 m,1. 0 m and 1. 2 m,and the velocity is 0. 64 m/s,0. 51 m/s and 0. 35 m/s,respectively. The relationship between the deformation velocity of chest wall and the lung injury is Ф= 0. 3192·V^3.0119.Conclusion The deformation velocity of chest wall is associated with the lung injury,and can be used as a predictor for the degree of lung injury under the blast shock wave.