By preshocking a condensed high explosive before the passage of a detonation front, it is possible to increase the peak pressure in the front to a level at which reflection phenomena can be readily observed by means of the Dautriche effect. Also, by the use of a tracer detonation wave, which intersects the shock configuration, it is possible to observe the oncoming detonation shock, the reflected shock, the Mach stem, and their intersection in a triple point. This method has been used to obtain strong evidence for the existence of Mach reflection of detonation waves in a preshocked explosive (RDX). The transition from regular to Mach reflection for an estimated 50-kbar precompression shock occurs discontinuously at a critical angle of 44.5° ±2° and quite rapidly, often in less than 3 × 10−8 sec.

Reflection parameters are derived for two colliding plane detonation waves in a condensed high explosive. The pressure and angle of the reflected shock wave are calculated as a function of the detonation-wave angle to the line of collision. The critical angle for the onset of Mach reflection and the pressure in the center of the Mach stem are also determined. Some comparisons are made between the results of this analysis and experiments.

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By the use of a metal indentation techinque, microscopic transverse or side-running shock waves can be detected in composition C-4, an explosive consisting largely of cyclonite (RDX) with organic plasticizers. The minimum wave spacing observed is approximately 0.05 millimeters. with a lateral velocity of about 6.5 millimeters per microsecond. The instability was demnostrated in cylindrically divergent detonation waves.