METHOD FOR DETERMINING CRITICAL CONDITIONS OF DESTRUCTION OF DETONATING LINE CHARGES CASES AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2017 - IPC F42B35/00 

FIELD: blasting.

SUBSTANCE: detonating line charge (DLC) case with a variable on length wall thickness is equipped by one of the known methods with blasting explosive - BE. Solid powder or individual, or mixed, plastic, pasty, plastisol or liquid. End sealing caps are installed, detonation initiation means is docked through lead charge, an explosive network is mounted and line charge is undermined. After the explosion, the minimum thickness of elongated charge case is measured, at which the shell retains its integrity, and then calculated from the known dependences the initial pressure on the contact surface of case and pressure on the outer surface of case for the measured value of critical thickness. This shock pressure is taken as the critical fracture pressure, to which corresponds a single-valued mass velocity at the front of the shock wave. In order to determine the critical conditions for the destruction of the inner case of multilayer line charge, a charge with a variable case thickness is undermined inside a massive cage made of a material of the outer layer of a double-layer charge, which is removed after undermining the DLC to remove the charge case from it. The device comprises a line charge case with an outer conical surface filled with a blasting explosive, a transfer charge, a detonation initiation means. It may contain end sealing caps from a thin structural metallic or non-metallic material and a massive cage of dense material with a wall thickness exceeding the case thickness of the conical line charge in its middle part by at least 10 times.

EFFECT: increasing the efficiency and accuracy of determining critical conditions for the destruction of cases of detonating line charge, a significant reduction in time and material costs, the versatility of method.

6 cl, 4 dwg