Mechanism of the Short-delay Controlled Blasting in the Air and Its Application in Anti-terrorist

摘要

The single point and two points short-delay controlled blasting in the infinite air were simulated with the nonlinear dynamic analysis software LS-DYNA.Blasting on the simulation results of the short-delay blasting mechanism,a method of the short-delay controlled blasting in the air was designed,and the six points short-delay controlled blasting was made in the same method also.The experimental results were consistent with the results of numerical simulation,so LS-DYNA finite element software can be used to analyze the short-delay controlled blasting.In this article,the method of the short-delay controlled blasting was used to break into a door in anti-terrorist.In the case of the same distance and explosive charges,this method could reduce the air shock wave peak and the injury of personnel.It was found that the expansion bolt in a security door was the vulnerability of a door.In the experiment of breaking into a door,the reasonable dose of breaking into a door was obtained,according to the overpressure peak under different doses,the safe distance for anti-terrorist personnel was calculated.