| Abstrakt: |
Inferring detonation velocities and Chapman-Jouguet (CJ) pressures from the near-field expansion of the transmitted air blast wave from detonating gram-scale explosives in a spherical or boosted spherical shell geometry has been demonstrated previously. Here, we investigated the feasibility of extending this technique to cyclotrimethylene trinitramine (RDX) pressed cylindrical charges to mitigate challenges associated with spherical geometries, by optically tracking the near-field blast wave propagation in the axial direction and applying Rankine-Hugoniot relations and Cooper's empirical relations to calculate the detonation velocity and CJ pressure. On average, the calculated values correspond well to those in the literature, but include values that are too low, presumed to be due to experimental error, and those that are higher than possible for non-overdriven RDX, implying this technique may have limitations in the extreme near-field of cylindrical charges due to a combination of blast wave asphericity and/or a limitation of the empirical assumptions in this regime. Modeling and further experiments are warranted to determine applicability of this technique to novel and non-ideal explosives requiring boosting and/or confining to detonate. [ABSTRACT FROM AUTHOR] |
