Based on fractal theory and heat conduction theory,the correlation among sensitivity,heat conduction,and fractal dimension of energetic materials were analyzed.Meanwhile,the fractal heat conduction models of micro and nano energetic materials were established.To verify the correctness of the model,the size fractal dimension and surface fractal dimension of two kinds of nitroamine explosives with different particle size were calculated,and the thermal conductivity was calculated by the model.The results show that the tangential effective thermal conductivity(kt)and radial effective thermal conductivity(kr)of nano RDX were higher by 0.204 and 0.059 W/mk than kt and kr of raw RDX,respectively.The kt and kr of nano HMX were higher by 0.079 and 0.426 W/mK than kt and kr of raw HMX,respectively.This meant that nano energetic materials were of higher effective thermal conductivity than micron energetic materials,which quite benefited to dissipating of the heat and decreasing of temperature of hot spots.Thus,nano energetic materials exhibited lower sensitivities.It is also concluded that the sensitivity of energetic materials can be assessed by means of the models.
Chinese Journal of Explosives & Propellants
Weapons and Equipment Pre-research Fund (No.6140656020201).
nanometer energetic materials
thermal conduction models
WANG Yi (1980-),male,associate professor,reserch direction: energetic material.E-mail: email@example.com