Cylindrical cavity in a layer of solid explosives: dynamics of collaps on impact, critical conditions for explosion

A numerical and analytical solution has been carried out for the hydrodynamic problem of the collapse of a cylindrical cavity in a freely spreading layer of solid explosive upon impact. Based on the results of calculations of the conditions for the initiation of HMX-type explosive charges, the critical impact parameters, geometric and physical-mechanical characteristics of the layer and the properties of the gas cavity were determined. The dual role of gas in the cavity was established, in some cases facilitating or preventing the process of explosion occurrence.