Overcompression of spherically converging detonation in plasticized TATB

Detonation overcompression during detonation convergence in a hemispherical charge of plasticized triaminobtrinitrobenzene with outer and inner radii of 75 and 20 mm after its initiation along the outer surface is studied. The experiment is numerically simulated with account for the transformation kinetics of an explosive into explosion products. The overcompressed detonation parameters in the explosive under study at a diagnosable charge radius of 20 mm are obtained via experiments and calculations: in the profile maximum, the pressure is 70 GPa, the front velocity is 9.45 km/s, and the mass velocity behind the front is 3.88 km/s. The overcompression achieved in the experiment under consideration is 2.3. The adiabatintersection point of the “nonreacting” explosive and its explosion products is revealed, which is implemented at a radius of 31 mm and a pressure of 52 GPa. The corresponding front velocity and the mass velocity behind the front at this point are 8.55 and 3.18 km/s. The resulting parameters at the adiabat intersection point are compared with the available literature data for triaminotrinitrobenzene and compositions based on it. A fairly large scatter of data is revealed. Suggestions are made about the causes of the scatter.