Modified model of Al/PTFE projectile impact reaction energy release considering energy loss

Aiming at the evaluation model of Aluminum/Polytetrafluoroethylene (Al/PTFE) impact reaction energy release established by Ames R G, the factors that have great influence on reaction energy release, such as vessel wall energy absorption and ejected gas energy, are ignored in the model. In fact, the sum of the initial kinetic energy and the impact reaction energy release should include the increase of target internal energy, the enthalpy of gas products, the thermal radiation energy, the kinetic energy of gas products and the energy absorbed by the vessel wall. The evolutionary rules of each part energy are quantitatively evaluated by quasi-closed vessel experiments at different impact velocities combining with various measured methods such as overpressure sensor, high speed camera, instantaneous optical pyrometer and infrared thermal imager. The Ames R G model is modified based on the results of reaction energy release at different impact velocities, and a modified model of reaction energy release considering temperature is established. The results show that with the increase of impact velocity, the enthalpy of gas products and the energy absorbed by the vessel wall increase greatly. The energy absorbed by the vessel wall accounts for most of the projectile impact energy release. The impact reaction energy release of unit mass projectile increases with the increase of impact velocities. When the impact velocities are in the range of 389-509 m/s, the increase of reaction release energy is significantly lower than that of 509-596 m/s. The modified model considering energy loss can be used to quickly evaluate and characterize the reaction energy release characteristics of active materials under impact load.