Residual stresses in a closed cylindrical shell with a longitudinal crack

1992 ◽  
Vol 62 (1) ◽  
pp. 2531-2536
Author(s):  
V. A. Osadchuk
Keyword(s):  
Cylindrical Shell ◽  
Residual Stresses ◽  
Longitudinal Crack ◽  
Closed Cylindrical Shell

On the elastic buckling of cross-ply composite closed cylindrical shell under hydrostatic pressure

2021 ◽  
Vol 227 ◽  
pp. 108633
Author(s):  
Muhammad Imran ◽  
Dongyan Shi ◽  
Lili Tong ◽  
Ahsan Elahi ◽  
Muqeem Uddin
Keyword(s):  
Cylindrical Shell ◽  
Hydrostatic Pressure ◽  
Elastic Buckling ◽  
Closed Cylindrical Shell

scholarly journals Buckling Analysis of an AUV Pressure Vessel with Sliding Stiffeners

2020 ◽  
Vol 8 (7) ◽  
pp. 515 ◽  
Author(s):  
Artur Siqueira Nóbrega de Freitas ◽  
Alexander Alfonso Alvarez ◽  
Roberto Ramos ◽  
Ettore Apolonio de Barros
Keyword(s):  
Cylindrical Shell ◽  
Residual Stresses ◽  
Structural Design ◽  
Autonomous Underwater Vehicle ◽  
Underwater Vehicle ◽  
Manufacturing Cost ◽  
Buckling Loads ◽  
Buckling Resistance ◽  
High Hydrostatic Pressures ◽  
Innovative Concept

The structure of an autonomous underwater vehicle (AUV), usually composed of a cylindrical shell, may be exposed to high hydrostatic pressures where buckling collapse occurs before yield stress failure. In conventional submarines, welded stiffeners increase the buckling resistance, however, in small AUVs, they reduce the inner space and cause residual stresses. This work presents an innovative concept for the structural design of an AUV, proposing the use of sliding stiffeners that are part of the structure used to accommodate the electronics inside it. Since the sliding stiffeners are not welded to the shell, there are no residual stresses due to welding, the AUV fabrication process is simplified, enabling a reduction of the manufacturing cost, and the inner space is available to accommodate the equipment needed for the AUV mission. Moreover, they provide a higher buckling resistance when compared to that of an unstiffened cylindrical shell. A comparative analysis of the critical buckling loads for different shell designs was carried out considering the following: (i) the unstiffened shell, (ii) the shell with ring stiffeners, and (iii) the shell with sliding stiffeners. Results evidenced that major advantages were obtained by using the latter alternative against buckling.

Asymptotic Evaluation of a Combined Stress-Intensity Factor for a Pressurized Cylindrical Shell Containing a Longitudinal Crack

1980 ◽  
Vol 47 (3) ◽  
pp. 583-585 ◽  
Author(s):  
J. W. Nicholson ◽  
M. R. Bradley ◽  
C. K. Carrington
Keyword(s):  
Stress Intensity Factor ◽  
Cylindrical Shell ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Asymptotic Form ◽  
Longitudinal Crack ◽  
Asymptotic Formulas ◽  
Combined Stress ◽  
Isotropic Cylindrical Shell ◽  
Asymptotic Evaluation

Sanders’ path-independent energy-release-rate integral I for a cracked shallow shell is used to compute the asymptotic form of the combined stress-intensity factor for a pressurized elastically isotropic cylindrical shell containing a longitudinal crack. The combined stress-intensity factor is expressible in terms of the conventional stretching and bending stress-intensity factors and is a function of Poisson’s ratio v and a dimensionless crack length λ. When λ is small the shell is nearly flat and when λ is large the shell is very thin. Asymptotic formulas for I when λ is small or large are obtained. A numerical solution for λ = 0(1) is also obtained.

Approximate Roots of Flu¨gge’s Characteristic Equation for the Closed Cylindrical Shell

1969 ◽  
Vol 36 (2) ◽  
pp. 352-355 ◽  
Author(s):  
J. R. Colbourne
Keyword(s):  
Cylindrical Shell ◽  
Characteristic Equation ◽  
Approximate Solutions ◽  
Harmonic Number ◽  
Higher Harmonics ◽  
Closed Cylindrical Shell ◽  
Shell Characteristic

Two approximate solutions are given for Flu¨gge’s closed cylindrical shell characteristic equation, valid for the lower and higher harmonics, respectively. It is shown that as the harmonic number increases, the roots of Donnell’s characteristic equation do not behave asymptotically like those of the Flu¨gge equation.

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