关键词: 活性材料, 冲击点火, 爆燃反应, 热力-化学耦合, 近场动力学

Abstract: To study the energy release behavior of impact ignition and deflagration reactions in fluorinated polymer based reactive materials，Based on experimental observations, cumulative temperature rise ignition mechanism and transient thermal diffusion reaction mechanism were proposed, and thermal coupling simulation of Taylor rod impact ignition process of active material was carried out , and the simulation provided the local hot spot temperature rise under the corresponding mechanism. On this basis, a heat transfer-chemical reaction model for fractured materials was constructed using the bond-based peridynamics thermal diffusion theory and combined with local hotspot information. The solution results were verified and analyzed using infrared temperature measurement experiments. The results showed that the simulation characteristics of deformation and fragmentation of the Taylor rod before ignition reaction are basically consistent with the experimental recorded images, which well reflects the inert response of the reactive material. By superimposing adiabatic shear temperature rise and friction temperature rise, a local area of the rod can form a hot spot region that meets the ignition threshold which basically corresponds to the location of the first flare, the distribution of adiabatic shear temperature rise and friction temperature rise is uneven, with significant differences in starting positions, and adiabatic shear temperature rise plays a dominant role in the total impact temperature rise, implying that the ignition mechanism of cumulative temperature rise can describe the impact ignition characteristics of materials. The simulation of deflagration reaction process proves that the temperature distribution inside the flame is directly affected by the mass and morphology distribution of impact fractured materials; Compared to the heat transfer effect, the reaction heat continuously released as the reactivity of the active site increases plays a crucial role in maintaining the high temperature state of the region.

Key words: reactive materials, impact initiation, deflagration reaction, thermochemical coupling, engraving, peridynamics