Dynamic Behavior of Various Stiffened Cylindrical Shell under Internal Pressure and External Pressure

2004 ◽  
Vol 2004.10 (0) ◽  
pp. 305-306
Author(s):  
Yoshiaki YASUI ◽  
Junya HARADA
Keyword(s):  
Cylindrical Shell ◽  
Internal Pressure ◽  
Dynamic Behavior ◽  
External Pressure ◽  
Stiffened Cylindrical Shell

Nonlinear Finite Element Analysis of a Toroidal Shell With Ring-Stiffened Ribs

2010 ◽  
Author(s):  
Qing-Hai Du ◽  
Wei-Cheng Cui ◽  
Zheng-Quan Wan
Keyword(s):  
Finite Element ◽  
Cylindrical Shell ◽  
Circular Cylindrical Shell ◽  
Structural Characteristics ◽  
External Pressure ◽  
Nonlinear Finite Element ◽  
Toroidal Shell ◽  
Shells Of Revolution ◽  
Element Analysis ◽  
Stiffened Cylindrical Shell

The toroidal shell is a special type of shells of revolution, which is hardly solved by analytical method. To show the nonlinear structural characteristics of a circular toroidal shell with ring-stiffened ribs due to external pressure, both material nonlinear and geometric nonlinear Finite Element Analyses (FEA) have been presented in this paper, especially for the stability to the type of pressure hull. In the presented Finite Element Method (FEM), the elastic-plastic stress-strain relations have been adopted, and the initial deflection of toroidal shell created by manufacture was also taken into account. The analytic results eventually indicate that by nonlinear FEA such a new type of ring-stiffened circular toroidal shell could be used to a main pressure hull as the traditional ring-stiffened circular cylindrical shell, which could obtain kinds of performance in underwater engineering, such as better stability and more reserve buoyancy to the classical ring-stiffened cylindrical shell.

Fitness for Service Assessments of Bulging and Out-of-Round Structures

2004 ◽  
Author(s):  
Peter Carter ◽  
D. L. Marriott ◽  
M. J. Swindeman
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Internal Pressure ◽  
Structural Model ◽  
External Pressure ◽  
Element Analysis ◽  
Structural Imperfection ◽  
Level 2

This paper examines techniques for the evaluation of two kinds of structural imperfection, namely bulging subject to internal pressure, and out-of-round imperfections subject to external pressure, with and without creep. Comparisons between comprehensive finite element analysis and API 579 Level 2 techniques are made. It is recommended that structural, as opposed to material, failures such as these should be assessed with a structural model that explicitly represents the defect.

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