MORE ON HIGH OBLIQUITY IMPACT AND EXPLOSIVE INITIATION

Abstract

The initiation of covered high explosives (HE) upon impact was studied employing 3D numerical simulations, based on experimental calibration, where emphasis was placed on very high obliquity impact angles, close to the ricochet angle. Two distinct initiation models were used and compared in the work, ignition and growth model (IG) and, the Temperature Dependent Reaction Rate (TDRR) initiation model. A comparison is made between the initiation prediction of the two models at the very high obliquities regime. As the impact obliquity increases, the vertical component of the impact velocity decreases while the tangential component increases, raising the overall impact velocity needed for HE initiation in all cases. However, as the impact obliquity continues to increase, an anomaly in the impact velocity needed for initiation, where both the normal and the tangential components increase to achieve initiation, is observed in both models.