Dynamic instability associated with interactive buckling of ring stiffened composite shells

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Abstract

The dynamic instability associated with the interactive buckling of ring stiffened composite shells under hydrostatic pressure is investigated. An optimally designed shell has its corresponding local and overall buckling pressures close to each another. The shell response is then governed by the nonlinear interaction between the modes which makes the shell very imperfection-sensitive. A submarine shell structure can be subjected to suddenly applied overpressure or successive shocks. The dynamic instability that is triggered can cause a reduction in the buckling pressure and large amplitude vibrations causing de Liminations. The dynamic interactive buckling analysis developed in this study is a combination of the amplitude modulation technique and the asymptotic procedure. The nonlinear differential equations of motion for the structure so developed are solved by using the Newmark method for time step integration along with Newton-Raphson iterations. Orthotopic and anisotropic cases of ring stiffened shells are considered. The reduction of the load carrying capacity due to dynamic instability under modal interaction is found to be significant in optimally designed shells. Interlaminar stresses are also computed to assess the risk of a delamination type of failure.

Original languageEnglish (US)
Title of host publication33rd Aerospace Sciences Meeting and Exhibit
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
StatePublished - Jan 1 1995
Event33rd Aerospace Sciences Meeting and Exhibit, 1995 - Reno, United States
Duration: Jan 9 1995Jan 12 1995

Other

Other33rd Aerospace Sciences Meeting and Exhibit, 1995
CountryUnited States
CityReno
Period1/9/951/12/95

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