| Research on the performance of Insensitive High Explosive(IHE)has become the focus of ammunition design.Due to the anisotropy of TATB-based insensitive explosives and the irreversible nature of expansion and contraction,when the ambient temperature changes,the number of effective hot spots formed inside it will change,thereby changing the impact sensitivity of the explosives.By studying the effect of temperature on the impact initiation of TATB-based explosives,we can understand its important properties such as reliability and safety at different ambient temperatures.Foreign scholars' research on the high and low temperature of explosives mainly focuses on the impact sensitivity at extreme temperatures higher than or close to the pressing temperature,that is,80?or lower than-30?.In order to make it better applied in the field of national defense,the influence of the temperature change around-20? to 30? on the performance of explosives was carried out in this paper.Common test methods used to study the performance of explosives at home and abroad include the manganin pressure gauge method,the polyvinylidene fluoride(PVDF)piezoelectric gauge method,Embedded multiple electromagnetic particle velocity gauge technique(EMV),and laser interference test technology.In this paper,two kinds of testing techniques:EMV technique and laser interference technology are used to measure explosive samples.According to the characteristics of the particle velocity of the impact loading interface measured by the laser interference test technology,the history of interface reaction at different depths is obtained,and another precise experimental data for calibrating the reaction rate function is provided in addition to the particle velocity history inside the sample.The main work of this paper is as follows:(1)In order to study the influence of different temperature on the growth rule of shock initiation reaction of insensitive explosive based on TATB,the samples of explosive were radiated by heating and cooling the silicone oil in the copper tube around the samples.A one-dimensional plane impact experiment was carried out by using a gun-driven sapphire flying plate method and an aluminum-based EMV technique.The Hugoniot relationship of the explosive was obtained by experimentally measuring the particle velocity and the shock wave velocity of the shock wave at different depths on the surface and inside.The time-distance(x-t)diagram of explosives to detonation was plotted according to the measured data of the shock wave tracer,and the Pop-plot reflecting the explosive detonation performance of the explosive was obtained-The velocity curve reaching the detonation is trimmed to the same zero point,and the time and width of the chemical reaction zone are calculated by reading the separation point of the velocity curve,which is the C-J point at the end of the reaction zone.Analyze and compare the properties of x-t diagram,Hugoniot relationship,Pop relationship,reaction time and width of explosive samples at four temperatures:-20?,5?,10?-15?,30?.The impact sensitivity of the obtained explosive samples becomes more sensitive as the temperature increases.(2)The shock initiation reaction of insensitive explosive has been investigated by means of the one-dimensional planar impact experiment and photon Doppler velocimetry technique(PDV).In the experiment,a sapphire flyer was launched by the powder gun and then impacted the stepped insensitive explosive.Meanwhile,the wedge-shaped lithium fluoride(LiF)windows coated with aluminum films were stuck to the different rear interfaces of stepped explosive.Therefore,the particle velocities among these interfaces could be experimentally measured,and by the impedance matching method,the particle velocities within the explosive were eventually calculated.The effects of the speed probe's angle,the probe's aperture,and the refractive index of the window are briefly analyzed.The relative uncertainty of the measured speed is less than 1%. |
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