Explosion Initiation during Gas Cavity Collapse in a Solid Explosive Layer

This study presents the case of an impact on a thin annular layer of an incompressible viscoplastic material with a cavity filled with gas. The layer is placed in a rigid assembly, such as a press mold, and is compressed by a piston at a constant velocity. The solution of the corresponding strength problem is performed according to a semi-inverse method with a specified rod-shaped medium flow and key equations of motion of the viscoplastic substance. The resulting data on the accelerated motion of the cavity walls are considered as an example of focusing (energy accumulation) in a converging flow. Information on the temperature distribution under a load on the layer is used to calculate the parameters of explosion initiation by an impact on a annular charge of a solid explosive. The possibility of thermal ignition of reactive substances without the participation of self-heating and only due to dissipated energy of mechanical action is discussed.