关键词: 活性内芯侵爆结构, 靶后超压, 活性材料, 多层结构靶

Abstract: The reactive filling structure exhibits a unique behavior of self-distributed deflagration and energy release, along with mechanically and chemically coupled dynamic characteristics when penetrating multi-layered plates. This results in a multi-peak, long-duration deflagration overpressure behind the plates, featuring a complex evolution and waveform mechanism of the deflagration process. To better understand this distinctive energy-releasing behavior, overpressure signals were recorded during experiments that involved the reactive filling structure penetrating multi-layered plates at various velocities. An equivalent deflagration position model and theories for deflagration overpressure were developed to clarify the waveform characteristics of deflagration shock wave. Experimental results show that the third collision produced the maximum peak overpressure., which increased from 0.0607 MPa to 0.246 MPa as the velocity rose from 594 m/s to 819 m/s(the impact stress in the range of 2.54 GPa to 3.92 GPa). The equivalent deflagration model indicates that the intense deflagration reaction occurred within a distance of 20.73 mm behind the plates. The peak deflagration overpressure is influenced by several factors, including thickness of the structure's head, the impact velocity, and the thickness of plates, all of which affect the effective initiated mass of the reactive filling. The analytical model aligns well with the experimental results, providing credible support for further investigations into the after-effects of the reactive filling structure.

Key words: reactive filling structure, behind-plate overpressure, reactive materials, multi-layered plates