Critical deflagration criterion of PTFE/Al/W reactive materials

The unique reaction regime of reactive materials includes processes of impact-induced fracture, pre-ignition, post-perforation dispersion, local initiation, and deflagration. The complex interaction between reactive materials and target leads to difficulty in describing critical deflagration criterion of reactive materials. As such, a fundamental projectile/target interaction condition for the complete deflagration of reactive material fragment is derived based on the 1-dimensional shock wave relationships. The critical deflagration pressure Pc of reactive materials is fitted based on the energy release experiments of reactive material fragments. The results show the importance and necessity of the fracture behavior to the deflagration, and the deflagration behavior depends on impact velocity, geometry of reactive material fragment, target material and thickness, et al. As for the deflagration of fractured reactive materials behind the target, the critical deflagration size for reactive material debris is obtained based on the Grady energy model.