| Popis: |
The CTH code was used to simulate sympathetic detonation experiments conducted using 105-mm projectiles separated by buffers of Plexiglas, rolled homogeneous armor (RHA), and mild steel buffer thicknesses near the experimental sympathetic detonation threshold were simulated. No propagation criterion associated with pressure loading was revealed by the results of this study. CTH computations were also made to confirm the presence of finite rise time or ramp waves in the acceptor explosive (previously observed in Lagrangian computations) with layered buffers of Plexiglas and steel. The CTH results show more structure in the ramp wave and shorter rise times than those previously obtained. The History Variable Reactive Burn (HVRB) explosive initiation model in the all code was exercised in simulations of similar configurations. These simulations showed that initiation may occur during propagation of the incident shock wave through the acceptor or after its reflection from the casing at the back of the acceptor. Predicted buffer thicknesses required to prevent sympathetic detonation are much less than those determined in the experiments, indicating that mechanisms in addition to shock initiation contribute to sympathetic detonation. |
