Abstract
In this paper, the buckling and post-buckling behavior of perfect and perforated composite cylindrical shells subjected to external hydrostatic pressure was experimentally investigated. Three filament wound composite cylindrical shells were fabricated from T700-12K Carbon fiber/Epoxy, two of which were perforated and reinforced. A test platform was established that allows researchers to observe the deformation of composite cylindrical shells under hydrostatic pressure in real-time during test. According to experimental observation, strain response and buckling deformation wave were discussed. Comparative analysis was carried out based on the experimental observation and finite element prediction. Results show that the deformation of composite cylindrical shell under hydrostatic pressure included linear compression, buckling and post-buckling processes. The buckling behavior was a progressive evolution process which accounted for 20% of the load history, and strain reversal phenomenon generally occurred at the trough of the buckling wave. As for the postbuckling deformation, the load carrying capacity of the shell gradually decreased while the magnitude of strain continued increasing. Both the perfect and perforated composite cylindrical shells collapsed at the trough of the buckling wave. Comparing with the perfect shell, it was validated the reinforcement design could effectively ensure the load carrying capacity of the perforated composite cylindrical shell.
Highlights
Composite materials have excellent mechanical properties such as specific strength and stiffness, low density and corrosion resistance, and have been widely used in marine engineering fields [1]
Lopatin [8,9] proposed an effective analytical solution to predict the critical buckling pressure of composite cylindrical shell subjected to hydrostatic pressure, where the vibration mode shape of clamped-clamped beam was selected as an approximation function and the Galerkin method was used to solve the governing equations
Oarnizthede oatshfeorlhloawnds,. strain reversal of No.2 and No.7 (1) The buckalilnsogobcceuhrarvedioart othfectoromupghos(iFtiegucryeli1n2d) rinictahlissshtealgle.uAndt tehre hbyoudnrodsatraytiocf cprreesst saunrdetrough was a progressive evolution process which accounted for more than 20% of the load history, and the load carrying capacity was still increasing in this stage
Summary
Composite materials have excellent mechanical properties such as specific strength and stiffness, low density and corrosion resistance, and have been widely used in marine engineering fields [1]. Formulas for the calculation of critical buckling pressure for composite cylindrical shells have been studied and discussed by many researchers. The researchers conducted extensive studies to maximize the buckling strength of composite cylindrical shells under hydrostatic pressure by using optimization algorithms coupled with analytical solution [26,27] or finite element method [28]. Some researchers investigated the buckling behavior of composite cylindrical shell subjected to hydrostatic pressure by testing. Moon [31] investigated the buckling and failure characteristics of composite cylindrical shells with winding sequences of [±30/90]FW, [±45/90]FW and [±60/90]FW under external hydrostatic pressure, where the strain response indicated that nonlinear behavior occurred before the shell collapsed. A test platform by integrated strain instrument, high-speed camera and hydrostatic chamber was established, allowing researchers to monitor the buckling evolution of the composite cylindrical shell under hydrostatic pressure in real-time. Some new finds were concluded, which could provide guidance for the safety design of composite cylindrical shell structure for underwater vehicle applications
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