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Acta Armamentarii ›› 2022, Vol. 43 ›› Issue (8): 1772-1778.

• Paper •

### Reaction Evolution Behaviors of Pressed Plastic-Bonded Explosive (PBX) under Different Mechanical Confinement Conditions

YAO Kuiguang, WANG Shujuan, FAN Xing, NIE Shaoyun, WANG Xiang, DAI Xiaogan

1. （Institute of Chemical Materials, CAEP, Mianyang 621999, Sichuan, China）
• Online:2022-07-29

Abstract: An experimental study was conducted to investigate the effect of mechanical confinement on the reaction behavior and mechanism of explosives, in which different confined charges of HMX based pressed PBXs were ignited at the center of the bottom surface via non-shock initiation with a newly designed mechanically confined charge ignition experimental device. The reaction violence was characterized by the reaction pressure and confinement disc velocity, while overpressure and recovery fragments were also analyzed. The results showed that: under 2 MPa mechanical confinement, charge deflagration occurred, where the maximum pressure of PBX-1 and PBX-2 charges were about 200 MPa, and the expansion velocity of the confinement disc were about 70 m/s; under 50 MPa mechanical confinement, charge explosion occurred, where the pressure of PBX-1 and PBX-2 charges exceeded 1 GPa in hundreds or even tens of microseconds, and the expansion velocity of the confinement disc reached 500 m/s; the physical properties of PBXs may cause some differences in reaction evolution, but the influence of mechanical confinement is more obvious; the reaction pressure and confinement dics velocity differed by almost one order of magnitude under 2 MPa and 50 MPa mechanical confinement using the designed device.

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