Study On Shock Wave Propagation Law And Hazard Effect Under Dense Biological Obstacles

In the environment with dense biological obstacles,the propagation law of explosive shock waves is different from that in air,and the harm to living bodiesliving bodies is also different.Therefore,the studies on the propagation law of explosive shock waves and damage to living bodies in the environment with dense biological obstacles living bodiesare significant.First of all,The experimental site was designed and constructed.Similar experimental study was conducted.Through the shock wave recording and overpressure value measurement after TNT explosion and the anatomical results of experimental rabbit injury degree,the propagation law of shock wave under this condition was obtained.The shock wave overpressure criterion for the damage to the organism is roughly defined.The specific work and results obtained are as follows:(1)By analyzing the non-dense shock wave overpressure values,the theoretical formulas that meet the experimental conditions are selected.The non-dense shock wave overpressure value range and the attenuation law fit well with the theoretical values calculated by Mills formula and Henrych formula.This shows that the experiment to obtain overpressure data is scientific and reliable.(2)By comparing the dense shock wave waveform and the non-dense shock wave waveform,it is found that there are two peaks in the dense shock wave waveform,and the second peak is the result of reflects,refracts,and flows of shock wave around the dense biological obstacle.(3)By comparing the overpressure values of dense shock wave waveforms and nondense shock waves,the variation law of overpressure is obtained.there are special points of overpressure changes in the vicinity of obstacles behind dense living living bodies.Compared with the value in the non-dense,The average of value in the dense column 3.0 m increases by 43.37%.(4)Through the analysis of the average velocity of the shock wave between the obstacles,the variation law of velocity is obtained.It is found that the velocity does not decrease monotonously.it is increasing from 2.0m to 3.0m.(5)By analyzing the anatomical results of experimental rabbits' heart and lung organs,the shock waves overpressure criterion for the damage to organism under the experimental conditions in this paper was roughly defined,and the injury levels were divided into four levels: mild,moderate,severe,and death.