Theoretical Study Of The Friction Sensitivity Of High Explosives

Based on the thermal reaction-diffusion equations of the thermal explosion theory, by the way of theoretical analysis and numerical simulation, the problem of high energy explosive's friction sensitivity is studied. One-dimension theory model has been built. For the experiment of explosive's friction sensitivity, the theory model of elevation of temperature caused by friction between explosive and metal has been built. The situation of low melting point's explosive being melting because of high temperature caused by friction is considered. Also it is considered that the friction resistance between explosive and metal caused by melting has changed, namely which is the changing of frictional coefficient after the melting. The rule that the temperature of friction interface between explosive and metal change with time, and also the temperature distribution of explosive and metal in friction is obtained by numerical simulation. The temperature in friction interface will suddenly turn when being some high value, then being infinite. When the temperature in friction interface raise some high value, if time is enough long, explosive will thermal explode. Under the condition of friction sensitivity experiment, by numerical simulation, the time of explosive ignition is got, then is compared with the data of experiment. The result is basically agreement. It is simulated numerically that in steel tube the explosive is igniting caused by friction between explosive and tube in two-dimension coordinate. The position of explosive ignition is found. The result is accord with the data of foreign literature.