explosion in water, guaranteed destruction, pulse load, destruction criterion.

The solution of the problems determining the process of the impact of an explosion of a charge of a condensed explosive substance (BB) on a beam in water is presented. It is noted that this process can be divided into two stages. At the first stage, a pulse load is formed an explosion in water; at the second stage, the impact of this load on the structural element (or the structure as a whole for the corresponding task). For the first stage, for the first time using experimental data, an analytical dependence for the specific impulse from an explosion in water of a spherical charge with specified physical and geometric characteristics was obtained. At the second stage, as a result of solving the corresponding initial boundary value problem, the dependence of the displacement of the beam sections for any moment of time is obtained, which allows us to find the conditions for guaranteed destruction of the beam in accordance with the selected destruction criterion. The statements and solutions of the corresponding tasks take into account: the effects of reflection of the disturbed incident water flow from the barrier (beam), the depth of immersion of the structure and the charge into the water, the physical and geometric characteristics of the charge and the beam, as well as their mutual location in the water, the type of fastening of the beam on supports. A significant influence of these factors on the magnitude of the charge, the explosion of which leads the beam in question to its guaranteed destruction, is noted.

Volodin Gennady Timofeevich, Doctor of Technical Sciences, Professor, Tula State University, Tula, Russia.

Kochergin Denis Sergeevich, postgraduate student, Tula State University, Tula, Russia.