A Microscopic Model Predicting Hot-spot Ignition of Energetic Crystals under Drop-weight Impact
A micro-mechanics model of hot-spot formation in energetic crystal powders, cyclotetramethylene tetranitramine (HMX) subjected to drop-weight impact is developed. By considering contact deformation, friction and chemical reaction at the particle level, three hot-spot sources are included, namely, the micro-particle contact deformation between two equal-sized particles with no relative sliding, the contact sites between the impacting surface and the particles, and contacting zone between particles with a sliding velocity along the maximum shear-stress direction. Choosing a layer of equal-sized explosive particles, the temperature increases, localized melting, as well as ignition at three kinds of hot-spots can be predicted. The effects of drop height and particle size on the ignition processes are analyzed. Calculated results show a monotonously increasing time to ignition with a reduction in particle size. The threshold values of non-ignition for the particle size can be predicted.
WU Yanqing HUANG Fenglei
State key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
国际会议
2011 International Autumn Seminar on Propellants,Explosives and Pyrotechnics(2011国际推进剂、炸药、烟火技术秋季研讨会)
南京
英文
915-922
2011-09-20（万方平台首次上网日期，不代表论文的发表时间）