Abstract
The analysis of effects of the hydrodynamic field created by the explosion of condensed explosive charge on the simplest construction element in the form of beams in the water is performed. The features of the load due to the location of the beam in the water are taken into account by the attached mass introduction. The classical condition of the element destruction is used, according to which it is necessary that the stress in the element is greater than the ultimate resistance of the material and refined of O.E. Vlasov’s formula on the proportionality of the bending moment to the acting explosive load pulse is used.
Highlights
When blasting charges in the air at close distances from construction elements, the main load carriers are explosion products, at farther distances – an air shock wave, i.e. in both cases the load is transmitted through a medium whose density is significantly less than the density of the material of the construction element.In case of the non-contact charges explosion in the water, the load on construction elements is transmitted through the medium, whose density is comparable to the density of the construction material.With the beginning of the element deformation in the water, the element itself comes into motion, and a significant part of the medium particles in direct contact with it, as a result of this phenomenon, the movement of the element is inhibited
The analysis of effects of the hydrodynamic field created by the explosion of condensed explosive charge on the simplest construction element in the form of beams in the water is performed
When studying the effect of an explosion on elements of construction elements located in the water, two cases that are significantly different from each other should be distinguished [1, 5]: 1. The construction element is completely in the water; 2
Summary
When blasting charges in the air at close distances from construction elements, the main load carriers are explosion products, at farther distances – an air shock wave, i.e. in both cases the load is transmitted through a medium whose density is significantly less than the density of the material of the construction element. With the beginning of the element deformation in the water, the element itself comes into motion, and a significant part of the medium particles in direct contact with it, as a result of this phenomenon, the movement of the element is inhibited This effect of the medium resistance to the displacement of a solid body in it in hydrodynamics is taken into account by the introduction of attached mass [1, 2]. Mathematical model Consider a beam with freely supported ends located in the water
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