高加速度过载下延期元件的失效机理研究

采用Hopkinson杆高过载试验技术和数值模拟方法对B/BaCrO4延期体在高过载环境下的延期性能和失效机理开展了研究.研究结果表明,延期体在冲击过载过程中承受多次加载和卸载过程,导致延期体变形和包括延期药柱层裂和延期药抛射在内的延期装药结构破坏,体现在随着过载加速度的增大,延期体燃烧速度增大,燃烧速度散布加大,延期精度降低.

Failure Mechanism of Delay Element Loaded with High Acceleration

Delay performances and failure mechanism of B/BaCr04 delay element in the environment of high over-load were studied by Hopkinson bar technique and simulation. Delay element will tmdergo load and unload frequently in the over-load process, which will induce deformation of the element and fracture of structure of delay charge including delay charge broken and delay composite jetted. It can be found that with the acceleration increasing, the burning rate of delay charge and its scatter is increased, and the precision of delay time is lowered.