Research on ignition and reaction characteristic of PTFE-based reactive materials

Abstract

Abstract In order to study the ignition characteristic of PTFE-based reactive materials (RMs), Al/W/PTFE RMs with different W powder contents were prepared and split Hopkinson pressure bar (SHPB) test was carried out under different loading conditions. The temperature rise of three RMs were calculated theoretically. The material model parameters of the three formulations were calculated by using the mixture equation of state theory and Johnson-cook model, and the impact process was numerically simulated by using AUTODYN dynamics software. The results showed that the Al/PTFE (26.5/73.5) formula material has ignition reaction when the impact speed is 27.47m/s, and Al/W/PTFE (7.94/45.33/46.73) formula material is 28.68m/s. Al/W/PTFE (5.29/80/14.71) only has weak ignition reaction under experimental conditions. The ignition reaction of RMs is related to the impact temperature rise. Under the impact condition, local high temperature induced ignition occurred at the crack of RMs.With the increase of W powder content, the overall temperature rise of RMs decreased, and the reaction degree of RMs decreased.