关键词: 活性材料, 落重冲击, 弱耦合跨尺度, 力化特性

Abstract: In order to study the mechanochemical response behavior of PTFE/Al/W fluoropolymer-matrix reactive materials under shock loading, the drop-weight impact test of fluoropolymer-matrix reactive materials was carried out, and a novel weak coupling trans-scale numerical calculation method was proposed. Based on this method, a trans-scale numerical simulation model of macro-meso scale fluoropolymer-matrix reactive material drop-weight impact loading reaction process was established. Combined with trans-scale numerical simulation, the macroscopic and mesoscopic structure mechanochemical response behavior and impact activation mechanism of the sample in the drop-weight impact test are discussed and analyzed. The results show that the content of W has a significant effect on the impact activation reaction of fluoropolymer-matrix reactive materials, with the increase of W content, the impact activation threshold of the reactive materials system decreases. The weak coupling trans-scale numerical simulation analysis model effectively simulates the mechanochemical response process of fluoropolymer-based reactive materials. The shear band is the dominant mechanism for the breakage and activation of fluoropolymer-based reactive materials, and its formation, evolution and distribution are greatly affected by W content.

Key words: reactive material, drop-weight impact, weak coupling trans-scale, mechanochemical properties