Influence of the stress-strain state, arising up at dynamic loadings on safe external of helmet environments.

А. S. Byelikov, О. А. Sabitova, А. S. Chaplyhin, N. V. Dolhopolova

Abstract


Purpose. Due to modernization of construction of monolithic panel of glazing took away the increase of safety of leadthrough of emergency-restoration and repair-build works workers of the special divisions. Methodology. Application of the special hardwares for providing of safety of the specialized subdivisions in case of occurring of extraordinary situations. Findings. The paper deals with the ensure the safety employees who perform emergency repair and Repair construction works under extreme conditions. The authors propose the construction of helmet with visor, which is protected by patent Ukraine. Models for the calculation of the stress-strain state (SSS) of multilayer protective visor are mathematically justified. The strength calculation technique of monolithic panel protective visor under contact with fragments of building structures is developed. It is agreed with the methods of testing according to ISO fire helmets. The stresses in the monolith safe visor made as cylindrical panel from polycarbonate are determined. This is the first step of pre-strength calculations at impulse impact to the outer surface protective visor as a cylindrical surface. The paper considers the behavior of polycarbonate sheets which are produced with a nominal thickness:h0 = 4, 8 & 12 mm. Originality. For a given external impulse loading are received characteristic functions depending on the location
depth of the stress in a protective layer that operate in the fibers protective visor. It’s have a linear form. The calculation data are given. Comparing the calculation results with the basic provisions of elasticity theory of SSS plates and shells are carried out. Practical value. Ways of modernization helmets of fire-rescue and constructive ways of strengthening is planned.


Keywords


accident recovery and repair construction works; safety of work; protective helmets and visor; curvature radius and thickness of monolithic glazing visor; the calculation of strength.

References


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