Research on the response characteristics of Al/PTFE active materials under explosive detonation

DOI:	10.11809/bqzbgcxb2023.02.027
Keywords:	Al/PTFE active materials; detonation loading; coaxial combined charge; shock wave convergence; waveform; detonation like reaction
Abstract:	In order to investigate the response characteristics of an active material, aluminum polytetrafluoroethylene (Al/PTFE), under explosive detonation, this paper carries out end surface and head on collision detonation loading tests of two high detonation velocity explosives on active materials, which are JO 8 and DHL. The propagation of the detonation waves and the response traces excited by the active materials are recorded by high speed rotating mirror streak cameras. Combined with theoretical analysis, pressure values of the shock waves in the active materials in two detonation loading modes are obtained. The results show that, under the loading of end surface detonation, Al/PTFE reacts violently under the action of incident shock waves with an initial high pressure of about 33.59 GPa. However, with the attenuation of the shock waves, the reaction rate decreases rapidly, which indicates that the active materials are unable to produce self sustaining detonation. Under the loading of head on collision detonation, Al/PTFE is subjected to continuous high pressure. Although the initial pressure of the incident shock waves generated by the sliding detonation loading is only 15.76 GPa, superposition and convergence of the shock waves appear in the center of the active materials and thus form a high pressure concentration area, where detonation like reaction occurs and the reaction rate reaches 4 mm/μs. However, the process of the reaction needs to be further researched. In addition, the research also indicates that the coaxial combined charge structure can make the active materials subjected to the continuous strong impact loading generated by explosive detonation, which not only significantly increases its reaction rate, but also avoids the problem that its reaction is unable to sustain itself. The above researches provide reference for the design of the related warhead charge.
Published:	2023-02-28
PDF HTML