Research On Explosive Train Of Micro-charge Based On Pyro-EMSAD

Pyro-EMSAD micro-charge detonation train based on pyrotechnics and electromechanical safety and arming can realize the functional requirements of low energy input and high energy output by using the mechanism of shock-to-detonation,but there is a lack of relevant experimental research and theoretical models.Based on the summary and analysis of flyer initiation technology,semiconductor bridge ignition technology and micro-security technology of MEMS,the components of Pyro-EMSAD micro-charge detonation train are studied by combining experiment with numerical simulation.Planar SCB energy-exchange based on PCB and LTCC processes were designed respectively.The material,structure size and processing technology of flyer transducer and safety mechanism were studied.The principle prototype of micro-charge detonation train with two partition modes was successfully manufactured.The main research contents and conclusions are as follows:(1)The resistance value of planar SCB energy-exchange based on PCB process is about 1.14?,while the resistance value based on LTCC process fluctuates greatly with an average resistance value of 1.374?.The width and position of the cantilever beam of the slider are determined by simulation calculation,and the slider's unblocking pressure is 31.87 MPa.(2)The parameters of JWL equation of state were obtained by ?-fitting method and proved that the fitting parameters can be used for simulation calculation of flyer energyexchange.The simulation model was established to study the influence of lead azide driving flyer process on the confinement shell of flyer transducer with different diameters,and the influence of different charge diameters,flyer thickness and barrel diameter on the flyer velocity.The results show that the confinement shell diameter and the barrel diameter of the flyer transducer can be set at 0.8cm,the ratio of charge diameter to barrel diameter is about 1.6:1,and the energy utilization ratio of the charge is the highest,and the flyer velocity decreases gradually with the increase of the flyer thickness.Fitting the velocity of flyer with different thickness,the trend conforms to quadratic function in the range of 0-0.16 mm.According to the relationship between the kinetic energy of flyer and the thickness of flyer,the thickness of flyer is determined to be 80?m.(3)The experimental results show that the ignition performance of planar energyexchange made by PCB process is better,but it does not meet the performance index of 1A1W5 min non-ignition;stainless steel flyer is easier to cut than titanium flyer,and the output power of stainless steel flyer is greater under the same conditions;lead azide(charge size is ?1.6×2.0)drives 30?m stainless steel flyer,which can reliably detonate the allowable explosive HNS-IV;laser-processed stainless steel slider can realize the release function;the preliminary principle prototype of micro-charge detonation train can basically realize the arming-initiationboosting function;both stainless steel slider and PCB plate can isolate the output of high-speed flyer and realize safe function.