Campbell's and other authors' experimental studies of behaviors of initiation and after-initiation for heterogeneous explosives were introduced and analyzed, but initiation conditions were not dealt with. When an intense shock wave enters a heterogeneous explosive charge, detonation is initiated by the shock wave instantaneously (i.e. not to undergo induction time) and directly (i.e., not to pass through other processes, such as deflagration). Then a building up detonation wave propagates throughout the heterogeneous explosive charge until it develops into a normal detonation. This whole process is called the buildup of detonation with the new definition in this paper. The so-called reactive shock wave is the building up detonation wave in early stage. Buildup of detonation (in terms of new definition) is a characteristic for all secondary explosives. Incomplete reaction and running to complete reaction of explosives are the chemical mechanism of buildup of detonation.

explosive  /  detonation  /  initiation  /  equation of state