The influence of the reinforcement of carbon thin-walled open cylindrical shells on free vibrations

DOI: 10.34759/trd-2022-123-03

Аuthors

Seregin S. V., Dobryshkin A. Y.^*, Sysoev E. O.^**, Zhuravleva E. V.^***

Komsomolsk-na-Amure State University, 27, Lenina str., Komsomolsk-on-Amur, 681013, Russia

*e-mail: wwwartem21@mail.ru
**e-mail: fks@knastu.ru
***e-mail: diana@knastu.ru

Abstract

Thin-walled cylindrical shells found wide application in various industries. The development of technology puts forward more and more serious requirements for the strength and stability of structures along with their low weight and cost. Such requirements are being applied to aeronautical engineering and unmanned aerial vehicles. The optimal solution in many cases consists in applying thin-walled shells made of carbon materials with high strength properties. The shell structures are being exposed to temperature and wind loads, variable atmospheric pressure during the aircraft flight and many other dynamic impacts. Thus, the structural materials of the shells should be lightweight and durable. Recently, carbon materials, which are an order of magnitude lighter and stronger that metal, are being applied more often. Under operating conditions, shells are being exposed to high dynamic stresses that may lead to adverse effects. However, the problem of the multilayer carbon shells dynamics is not fully understood up to now. Thus, for example, the known theoretical studies in a number of cases, have significant discrepancies in the values of the lowest frequencies of the vibration spectrum of reinforced shells with numerical calculations performed by the finite element method. This fact requires an experimental study on the behavior of low frequencies. The article provides an experimental study of the effect of multilayer reinforcement of thin-walled carbon fiber open cylindrical shells on their free vibrations. Experimental samples were created on the Komsomolsk-on-Amur State University basis for the experimental study of the effect of multilayer reinforcement of carbon thin-walled open cylindrical shells on their free vibrations. Models of shells with single-layer reinforcement were made of 2/2 12K-1000-600carbon fabric. Two-layer reinforcement was created from a layer of 2/2 12K-1000-200carbon fabric and a layer of 2/2 12K-1000-400 fabric. A three-layer reinforcement was created from three layers of 2/2 12K-1000-200carbon fabric. The experimental data was compared with the analytical solution. The experiments revealed an increase in the vibration frequencies of carbon thin-walled open cylindrical shells with an increase in the number of layers of carbon fabric reinforcement in relation to the values of frequencies obtained analytically.

Keywords:

vibrations, shell, experimental research, calculation method

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