ИСТИНА

The deflagration to detonation transition (DDT) in both pressed samples of different porosity and large single crystals of a typical primary explosive from the chemical class of organic peroxides, hexamethylenetriperoxidediamine (HMTD), was investigated in the interval of external pressures 0.1-30 MPa. The deflagration to detonation transition in HMTD single crystals at high pressures was found to occur easier than DDT in high density pressed samples. An important role of HMTD single crystal fracturing upon ignition was revealed. In all cases, the value of the predetonation column length decreased with the growth of external pressure. It has been shown that only quantitative differences exist between DDT processes in brisant and capable-to-combustion primary explosives.