Nonlinear free vibration analysis of prestressed circular cylindrical shells on the Winkler/Pasternak foundation

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• 作者：Firooz Bakhtiari-Nejad ; ^{baktiari@aut.ac.ir} ; Seyed Milad Mousavi Bideleh
• 关键词：Thin cylindrical shells ; Winkler/Pasternak foundation ; Nonlinear free vibration ; Rayleigh&ndash ; Ritz ; Perturbation ; Prestress ; Hydrostatic pressure
• 刊名：Thin-Walled Structures
• 出版年：2012
• 出版时间：April, 2012
• 年：2012
• 卷：53
• 期：Complete
• 页码：26-39
• 全文大小：1275 K

文摘

Nonlinear free vibration analysis of prestressed circular cylindrical shells placed on Winkler/Pasternak foundation is investigated in the present paper. The nonlinearity is considered due to large deflections. Simultaneous effects of prestressed condition and elastic foundation on natural frequencies of the shells under various boundary conditions are examined extensively in this study. The nonlinear Sanders-Koiter shell theory is employed in order to derive strain-displacement relationships. The nonlinear classical Love's thin shell theory is also applied in some specific cases due to contrast the results. Beam modal functions are used to approximate spatial displacement field. The governing equations in linear state are solved by the Rayleigh-Ritz procedure. Perturbation methods are used to find the relationship between vibration amplitude and frequency in nonlinear state. Prestress state includes the effects of internal hydrostatic pressure and initial uniaxial tension. Results are compared with published theoretical and experimental data for some specific cases.