发射药床冲击破碎过程的数值模拟

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...

Simulation of Fragmentation Process of Charge Bed Under Impact Load

Compress and fracture of gun propellant charge is one the fundamental reason of breach blow, the fracture dynamics of charge bed is one of the theoretical foundations in the research field of launch safety. Based on discrete element method, the packing process of propellant bed under gravity is simulated, and the close-grained structure of propellant bed was acquired; then the propellant grains were divided into spring-spheres system, applying Mohr-Coulomb failure rule, the compress and fracture process of propellant grains under impact load was simulated. In addition, the dynamic display was displayed by post processing, which reproduced the compress and fracture process of propellant grains in simulation chamber, and the computation mode provides a kind of important theoretical foundation and computation method for the study of fracture law of charge bed.