Istrazivanja i projektovanja za privreduJournal of Applied Engineering Science

DAMPing OF CIRCULAR COMPOSITE VISCOELASTIC PLATE VIBRATION UNDER NEUTRON IRRADIATION


DOI: 10.5937/jaes0-28088 
This is an open access article distributed under the CC BY 4.0
Creative Commons License

Sergey Vakhneev*
Moscow Aviation Institute (National Research University), Department of Engineering Graphics, Moscow, Russian Federation

Eduard Starovoitov
Belarusian State University of Transport, Department of Building Mechanics, Gomel, Republic of Belarus

During the irradiation of structural elements with neutrons, ions, electrons, the mechanical properties of materials change. The neutron irradiation is of particular interest. Therefore, the relevance of the study is beyond doubt. The main purpose of this paper is to investigate the vibration damping of a circular composite viscoelastic plate under neutron irradiation. According to existing concepts, two mechanisms of accelerated radiation creep are possible. An initial-boundary value problem of free vibrations damping in a circular linearly viscoelastic sandwich plate under neutron irradiation is considered. It is determined that when the frequency of the perturbing force coincides with higher frequencies of natural oscillations, the periodicity is blurred, although the amplitude of oscillations increases and, in this case, a "false resonance" is observed. An analytical solution is obtained using the averaging method in dynamic viscoelasticity problems. The logarithmic decrement of oscillations is investigated numerically. Its dependence on the intensity of the neutron flux is revealed.

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The work was carried out with the financial support of the RFBR grant 19-01-00675.

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