Analysis On The Failure Mechanism Of Key Components Of Fuze Initiation Control System And Its Reliability Under Impact

With the development and application of new defensive materials and construction techniques,the protection capability of many high-value targets in modern warfare has been continuously improved.The penetrating ammunition used to combat such high-intensity targets will be facing a series of issues,such as large quality and high penetration speed,which also means that fuse system within the missile body will experience more severe impact overload environment.As an important part of the fuse system,reliability of the detonation control system directly affects the damage effect of the target.According to the current experimental research,under high-speed penetration,failure problems such as mechanical damage,performance problems would appear in the detonation control system.At present,the performance failure mechanism of the crystal oscillator,solid tantalum capacitors and other devices under the impact is not clear,resulting in the currently commonly used detonation control system protection measures are not very effective.In view of the above problems,this paper focus on the failure mechanisms of quartz crystal and solid tantalum capacitors under impact,especially the failure mechanism of them,in order to provide references for the design of impact resistance and the reliability design of detonation control system.The main contents of this paper are as follows:(1)With the CETECJ-30 MHz active crystal as the research object,the performance of the quartz crystal under impact is tested and analyzed by the hammer impact test.The law of the probability of failure with the acceleration is given preliminarily.On this basis,the dynamic model of crystal vibration is established,and the force response characteristic of the crystal under impact is analyzed.What's more,the variation of the electrical parameters of the crystal with the impact load and the mechanism of its performance failure are given.(2)With the solid tantalum capacitors as the research object,the variation of leakage current under different impact situations is tested with Marshall drop hammer test.According to the analysis of the test results,the leakage current increases with the increase of the acceleration.Considering the actual working requirement,the failure probability of the solid tantalum capacitor increases exponentially with the acceleration.The solid tantalum capacitor model was established by LS-DYNA,and its mechanical response characteristics under impact were analyzed.It was pointed out that the contact stress of the contact position of solid tantalum capacitor particles under impact increased with impact effect,resulting in the interfacial stress increased,leading to the breakage of the Ta-O bond at the interface,then the number of electrons involved in the conduction increases,finally the current density increases.(3)The improvement scheme of removing the stud support is put forward for the circuit board assembly of the blasting control system,and the feasibility is verified by simulation.Finally,based on the fault tree analysis method,the reliability analysis of the fuse control circuit system used in the experiment and its failure probability are given.