Theoretical Investigation of the Wave Shaping Process in a Section of Ladder Fracture Tape

摘要

The presented paper describes the modelling of the detonation process in a section of Fracture Tape using the two-dimensional reactive Lagrangian Hydrodynamic code 2DL. The Forest Fire burn model of heterogeneous explosive shock initiation was used to model the explosive decomposition. The results show (i) the time dependent pressures (ii) detonation wave shaping and (iii) deformation of the tape. Fracture tape is a channel section neoprene moulding designed to be filled with plastic explosive. The moulding places barriers at regular intervals within the explosive which divide the detonation wave into two parts then focus both together to collide head on. The calculations indicate that with the ladder geometry Fracture Tape, the detonation wave propagates around the barriers, as well as creating a shock wave which is transmitted through the barrier itself. The transmitted shock wave may detonate the explosive immediately behind the barrier before the propagated detonation reaches it, thereby reducing the pressure enhancement from the expected collision for some distance from the barrier.