Preparation And Performance Study MEMS Impact Slapper Detonator

Impact slapper detonators have attracted extensive attention due to their high intrinsic safety and strong resistance to complex external environments.However,due to its high detonation threshold,high price and large size of its detonation system,it is only popularized and applied in high-value weapons,which restricts its application in conventional weapon systems.Therefore,this paper designs a low-fire energy,high-integration miniature shock-plate detonator,and studies its performance.(1)A miniature impact chip detonator(2.5mm in diameter,4.9mm in height(excluding foot wires))was prepared by combining MEMS technology and traditional technology,and the transducer elements(substrate,metal bridge foil,flying Plate and acceleration chamber)are integrated to reduce the volume of the shock plate detonator.Low-energy firing of shock sheet detonators is achieved through metal bridge foil shape design,bridge area(size,shape)design and HNS explosive refinement.(2)A MEMS impact chip detonator test system was built,and the electric explosion characteristics and electric explosion process of the detonator transducer were studied.The effects of bridge size and charging voltage on the electrical explosion characteristics of metal bridge foils are obtained.Studies have shown that reducing the size of the bridge region can reduce the initiation threshold of the metal bridge foil,and increase the charging voltage,which can improve the instantaneous degree of the metal bridge foil.The electrical explosion of the metal bridge foil was observed with an ultra-high-speed camera,and the electrical explosion process of the metal bridge foil under different input energies was analyzed.(3)Using the photon Doppler interferometry technique,the speed of the flyer driven by the transducer element is detected,and the influence rule of the bridge width,the diameter of the accelerating chamber and the charging voltage on the acceleration speed of the flyer is obtained.Increasing the charging voltage and reducing the diameter of the accelerating chamber can improve the acceleration of the flyer;the speeds of the flyers driven by metal bridge foils in three bridge areas of 0.1mm×0.1mm,0.15mm×0.15 mm and 0.2mm×0.2mm were measured,and they are respectively 1986m/s,2613m/s and 2128m/s.Combined with the electric Gurney model,it can be seen that the smaller the size of the bridge area,the higher the speed of the flyer,but when the size of the bridge area is 0.1mm×0.1mm,the speed of the flyer becomes smaller,because the size of the bridge area is too small,and the generated plasma is not enough Drive the flyer to a greater speed.(4)The 50% firing voltage and output power of the MEMS impact chip detonator were tested by the sensitivity lift method and the steel concave method.The 50% firing voltage of the MEMS shock chip detonator is 681 V,and the average depth of the steel dent is0.1349 mm.(5)The LS-DYNA software is used to simulate the formation of the flyer and the law of shock initiation,which provides a basis for the optimization and theoretical research of the shock chip detonator.