Kawakita模型在含能晶体颗粒压制中的应用研究

不同品质的晶体颗粒其力学性能应表现出某种差异.分别选取三种不同品质的RDX和HMX颗粒集合体进行压缩刚度实验,并采用Kawakita压制模型对压制曲线进行拟合分析,得到评价晶体颗粒力学性能的具有模量量纲的常数.RDX的两种重结晶样品和工业原料样品的拟合常数倒数值分别为13.08,12.16,5.51;HMX分别为11.43,12.57,10.05.选取压制过程中的颗粒破碎阶段的数据进行拟合,得到结果分别为RDX: 9.53,7.86,4.36;HMX: 6.13,6.48,5.56.结果表明,压缩刚度实验的Kawakita拟合常数可以定量比较不同品质样品的力学性能,选取破碎阶段数据的拟合结果更能反映物理本质.

Application of Kawakita Equation in Compression of Energetic Crystalline Particles

In order to study the mechanical property of explosive crystals with different qualities,two recrystallized and a commercial grade RDX and HMX particles were selected and tested by compressive stiffness method. The Kawakita equation is applied in fitting the compressive curves. The fitting constant of the equation,which is of the reciprocal dimension of modulus,can be used to evaluate the mechanical property of energetic crystalline particles. For RDX,the fitting results are respectively 13.08,12.16 and 5.51,corresponding to the two recrystallized samples and the commercial grade one. And the values for HMX turn out to be 11.43,12.57 and 10.05 respectively. However,the results of the fragmentation stage in compression are reduced to 9.53,7.86,4.36 for RDX,and 6.13,6.48,5.56 for HMX. The study proves that the fitting constants can be used to evaluate the mechanical property of energetic crystalline particles,and it also shows that the results based on the fragmentation processes describe the real mechanical behaviors better.