奥克托今/黑索今颗粒炸药在落锤撞击下碎片分布的实验分析

Experimental Investigation of Fragments of HMX/RDX Granular Explosives Subjected to Drop-weight Impact

在落锤撞击过程中,奥克托今/黑索今(HMX/RDX)大颗粒的碎片大小和分布是影响热点形成以及燃烧速率的一个重要原因,因此对落锤撞击下碎片大小及其分布的分析是研究落锤撞击下热点形成的一个必要前提。用落锤撞击装置对HMX/RDX大颗粒进行破碎实验分析。运用Mastersizer 2000激光粒度分析仪对破碎后的HMX/RDX碎片样品进行粒度分析,得到了HMX/RDX在不同落锤高度下碎片的分布曲线和碎片平均尺寸。从实验结果发现,随着落锤高度的增加,碎片的尺寸不断减小,但减小的幅值在变小。另外,在同样的落高下,HMX大颗粒的碎片比RDX大颗粒的碎片尺寸大。

Fragment sizes and distributions of HMX/RDX large particles play important role on the formation of hot spots and burning rates in drop weight test. Thus it is necessary to investigate the sizes and distributions of the fragments of HMX/RDX particles. The fragmentation of HMX/RDX large particles under drop weight impact is studied through experiment. The particle sizes of HMX/RDX fragments are analyzed to obtain the distribution curves and average sizes of fragments at different drop heights by using Malvern MS2000 laser particle size analyzer. The analyzed results show that,with the increase in the height of drop hammer,the sizes of fragments tend to be decreased,but the reduced magnitude decreases. When the drop height increases to a certain value,the average sizes of fragments tends to be relatively close. The fragments of RDX fragments are larger than those of HMX fragments at the same drop height.