含能材料表面分形维数计算及其对摩擦感度影响

Estimation of surface fractal dimension of energetic materials and influence on friction sensitivity

含能材料颗粒的表面粗糙度极大地影响了含能颗粒群的热传导性能,进而直接影响了其感度变化。但由于含能材料表面形貌极不规则,很难用传统的方法对其粗糙度进行定量描述。为了解决此问题,本文基于分形理论的基本原理,采用表面分形维数对其进行表征,以3种制备方法下的HMX颗粒为研究对象,利用MATLAB的图像处理和数值计算功能,计算得到了3组HMX颗粒的表面分行维数,并将此方法的计算结果与文献计算结果进行了对比实验。结果表明该计算方法准确、可靠。并且通过爆炸概率法实验探究了不同表面分形维数对3组HMX颗粒摩擦感度的影响,结果表明,摩擦感度随Ds增大而增大,但是其还与颗粒的晶型,粒径等因素有关,最后用热点学说对实验结果进行了分析。

The particle surface roughness which determined by the energetic materials surface morphology has greatly impact on thermal conductivity of multiple particles, which directly affect its sensitivity. But since the surface morphology is extremely irregular, it is difficult to describe the roughness accurately quantitatively using traditional methods. To solve this problem, the concept of surface fractal dimension based on fractal theory is given to describe the roughness in this paper. Choosing 3 different ways to make HMX particles, and the functions of MATLAB in image processing and numerical calculation were employed to get the surface fractal dimension of 3different HMX particles. A contrast experiment has been carded on between the calculation results of this method and the literature results. The results show that the calculation method is accurate and reliable. And exploring the influence on the friction sensitivity of 3 different HMX particles where different surface fractal dimension have, the results show that the friction sensitivity increases with Ds, but it is also affected by the crystal types ,particle size and other factors, and we analyze the experiment results with hot doctrine.