INDUCTIVE METHOD OF MEASURING THE PIPE WALL (CYLINDER TEST) IN THE DETONATION OF EXPLOSIVES

The measuring method “cylinder test” is used in researching the properties of explosive substances, that is, the detonation process of ideal and non-ideal detonation explosives. The ability of detonation gases to do work depends on their adiabatic expansion. The cylinder test can be used to determine the values ​​of the constants of the JWL expansion model, the Gurney velocities and pv ratios of the expansion adiabat. The speed of movement of the metal wall of the tube (cylinder) filled with explosives during detonation depends on the properties of the explosive (heat of detonation and speed of detonation), and through the speed of the tube wall, the working capacity of the explosive can be interpreted indirectly. Common measurements use contact, interference and video methods, which have disadvantages primarily in the complexity of the equipment. The proposed method uses electromagnetic induction settings when the permanent magnet moves through the coil in which EMS is induced. The first measurements showed the applicability of the method and the voltage record enables the interpretation of the speed of movement of the pipe wall. The advantages of the proposed method are expressed in the simplicity of the measuring setup and interpretation of measurement records, as well as the low cost of consumables and the possibility of performing tests in laboratory conditions.