细观尺度下塑料粘结炸药热点生成的初步模拟

Preliminary simulation of hot spot formation for plastic bonded explosives at mesoscale

1.
Laboratory for Shock Wave and Detonation Physics, Institute of Fluid Physics,China Academy of Engineering Physics, Mianyang 621900, Sichuan, China

摘要: 采用有限元与离散元相结合的方法模拟了塑料粘结炸药在冲击载荷下热点生成的细观过程,计算中炸药晶体采用有限元法，粘结剂采用离散元法。结果表明热点多集中在晶体间变形较大的粘结剂部分，粘结剂与晶体间冲击波的相互作用是热点生成的重要原因；HMX晶体温度明显低于粘结剂，且晶体边界温度高于内部温度。
- 流体力学 /
- 热点 /
- 细观模拟 /
- 塑料粘结炸药 /
- 有限元 /
- 离散元
Abstract: The preliminary mesoscale simulation was done for the hot spot formation of plastic bonded explosives(PBX) under shock loading with the combined method of the finite element and discrete element methods. The explosive crystals and binder are simulated using FEM and DEM, respectively. Simulated results indicate that hot spots focus on the binder region between crystals. The important factor of hot spot formation is the shock interaction between crystals and binder, the temperature of HMX is lower than that of binder, and the periphery temperature is higher than the inner temperature in HMX crystals.
- fluid mechanics /
- hot spot /
- mesoscale simulation /
- PBX /
- finite element method /
- discrete element method