基于离散单元法的发射装药挤压破碎动力学仿真

Dynamics simulation of gun propellant charge with compress and fracture based on discrete element method

为了探寻发射装药低温下挤压破碎机理,研究发射装药挤压破碎对发射安全性的影响,本文利用离散单元法模拟了发射装药动态挤压破碎过程.将发射药粒离散成弹簧-球单元系统,建立了发射药床挤压破碎动力学模型,仿真了发射药床在动态冲击载荷下的挤压破碎动力学过程.采用统计的方法定量地获得了破碎后发射药床的表面积,其结果与试验较为接近,验证了本文理论与模型的正确性.研究结果为进一步研究发射装药低温下挤压破碎对发射安全性的影响奠定了基础.

In order to reveal the mechanism of compress and fracture of gun propellant charge at low temperature, and study the effect of compress and fracture of gun propellant charge to launch safety, the dynamics process of compress and fracture of gun propellant is simulated by discrete element method. By dividing propellant grains into spring-spheres system, the dynamics model of compress and fracture of gun propellant charge is founded, and the dynamics process of compress and facture of gun propellant bed under impact load is simulated. The surface area of propellant bed after fragmentation is quantificationally acquired by statistical method, the simulation result and the test result have a good agreement with each other, which indicates the computational method is accurate. These results provide a theoretical foundation for the further study of the affect of compress and fracture of gun propellant charge at low temperature to launch safety.