中文摘要：

发射装药挤压破碎是导致膛炸的根本因素，发射药床的破碎动力学是发射安全性理论研究的基础之一．以离散元法为基础，模拟了发射药床的自然堆积过程，获得了发射药床的密实堆积构型；将密实构型下的发射药床离散成弹簧一球单元系统，应用Mohr—Coulomb型破坏准则，对发射药床动态压缩模拟试验装置中的发射药粒在动态载荷下的挤压破碎过程进行数值仿真，并对数值计算结果进行后处理，实现了模拟药室中发射药粒挤压破碎过程数值计算的动画显示，再现了发射药床冲击破碎动力学过程，仿真结果与试验结果吻合较好，验证了论文理论与模型的正确性，为进一步研究发射药床的破碎规律提供了重要的理论基础和计算手段．

英文摘要：

The fragmentation of gun propellant charge is the main reason of breach blow,and the fracture dynamics of charge bed is a very important but still open question in the launch safety theory. Based on discrete element method,the packing process of propellant bed under gravity is simulated,and the close- grained structure of propellant bed is acquired. Based on these, the propellant grains are divided into spring- spheres system, and then the fracture process of propellant grains under impact loading is simulated with the use of Mohr-Coulomb failure rule. In addition,the dynamic scenarios which reproduce the compression and fracture process of propellant grains in simulation chamber are displayed by post processing. Compari- son between the simulation result and test result show a good agreement with each other,indicating the present computational method is accurate.