| The micro-scale detonation system is a technology designed for the miniaturization and dexterity of the micro-scale initiation and detonation trains.According to the status report of domestic and overseas research on the initiation chips and ignition and detonation components in micro-scale detonation systems,the mature technologies used as a reference and existing problems at present were discussed;on the basis of the existing research,further research on the design principle of low-energy and high-security initiation chips and components,as well as the numerical simulations of micro-scale detonation system,were carried out.In the work reported here,the technical innovations in low-energy initiation of chips and miniaturization of substrates,design principle of micro-size detonation trains as well as other key technologies were achieved.Main results are listed as follows:(1)The design principle of MEMS fuze for micro-scale detonation system was proposed.Three types of explosive trains were designed: linear structure,L type structure and dislocated structure.The design theories and key technologies were presented and analyzed in micro-scale detonation trains.Linear structure and L type structure can not be reliably detonated due to the existence of detonation gap,the dislocated structure can meet the needs of safe and reliable detonation of small-caliber ammunition.(2)Based on the Fabry-Perot interferometric principle,an optical fiber temperature sensor was developed to obtain the temperature rising regulation of metal film bridge under constant current excitation.The design principle of low-energy and high-security initiation chips was made clear by the method of numerical simulations: for the rectangular bridge,the ignition voltage is the lowest,while the corresponding safety current is not the lowest,which precisely meets the needs of capacitor ignition;for the low-energy initiation chips with the dimensions of 40 × 40 × 0.5 ?m,the critical ignition voltage and current are 2.85 V and 185 mA,respectively.And the simulation results were verified by experiments.(3)The optimal design of micro detonator was obtained through the research on the design principle.For detonator with dimensions ?0.9 × 3mm,the pressure reaches a maximum of 11.2GPa when the height of CL-20 is 1.7mm and the charge height of lead nitride is 1.3mm.Non-linear dynamics software was introduced into the design of micro-size charge,and the parameters of the JWL equation of state were obtained.On this basis,the research on flyers driven by micro-scale charge was carried out to verify the validity of the method.By numerical simulation of the influencing factors of flake explosives,the influence of characteristic dimension on the output pressure was obtained.The advantages of this design method lie in not only the possibility of relatively fewer experiments depending on the simulation results,but also the implementation of quantitative design of the explosive trains with higher reliability.(4)According to the design requirements of the micro-scale explosive trains,a dislocated type of explosion train structure was developed.Firstly,the detonation process of explosive trains was studied by numerical simulation to obtain the output pressure.In addition,a planar micro actuator was studied from the perspective of the structure and critical charge.Furthermore,the transfer and non-transmission performances of micro-scale detonation system were experimentally validated;therefore,the combination of numerical simulations and experiments can be proved as an effective method for the design of micro-scale detonation system. |
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