落锤试验撞击粒状HMX炸药变形及点火过程数值模拟（英文）  

Numerical Study on Deformation and Ignition Process of Impacting Granular HMX Explosive in Drop Hammer Test

作　　者：殷璐[1] 刘志跃[1] 王丽琼[1] 

机构地区：[1]北京理工大学机电学院爆炸科学与技术国家重点实验室,北京100081

出　　处：《含能材料》2016年第9期898-904,共7页Chinese Journal of Energetic Materials

摘　　要：利用AUTODYN软件对落锤撞击粒状HMX炸药过程进行二维数值模拟。基于应力和塑性功的计算值,通过塑性功转化热能的原理,估算了颗粒中产生的温升。样品HMX颗粒为圆形几何形状,假设颗粒具有弹塑性变形特性。颗粒堆放形式有规则排布和不规则排布两种情形。通过设定的落高和由自由落体公式计算出落锤的初始速度。针对落高分别为33,40,50,60cm的情况,及样品颗粒材料不同屈服应力值(0.26,0.13GPa)进行计算,得到落锤撞击颗粒时的温升变化。结果表明,规则排布产生温度较低(37.2℃),而不规则排布产生温度较高(142.9℃)。在不规则排布当中,颗粒的局部塑性变形功可以导致较高的温升,从而引起颗粒点火。同时考虑到HMX的屈服应力值的不确定性,取较小屈服应力值(0.13GPa)进行温升计算,而其他计算条件相同,得到的温升值仅为83.2℃,比0.26GPa时低59.7℃。Two-dimensional numerical simulation of the impact process for drop hammer on granular HMX was carried out by using ANSYS/AUTODYN software. The temperature rise generated in particles was estimated via the principle converted from plastic work to heat energy based on the calculated values of stress and plastic work. The HMX particles was geometrical shapes and round, assuming that the particles had elastic-plastic deforming properties. Particle stack form had two kinds of situations of regular and irregular arrangement. The initial velocity of the drop weight was calculated through setting the drop height and the formula of free fall. For different drop heights and the calculation of different yield stress values of sample particle material, the temperature rise changes in particles under drop hammer impact were obtained. The results showed that the regular arrangement produces low temperature （37.2 ℃） rise, whereas the irregular arrangement produces higher temperature （142.9 ℃） rise. In irregular arrangement, the local plastic deformation work of particles can lead to higher temperature rise, causing particle ignition. At the same time, considering the uncertainty of the yield stress value of HMX, the calculation of temperature rise is performed taking the smaller yield stress value（0.13 GPa）, while the other calcu- lation conditions are the same, and the temperature rise obtained is 83.2 ℃, which got 59.7 ℃ lower than the yield stress value of 0.26 GPa.

关 键 词：落锤实验 HMX颗粒 数值模拟 温升 

分 类 号：TQ560.1[化学工程—炸药化工]