Non-linear buckling and postbuckling of shear deformable anisotropic laminated cylindrical shell subjected to varying external pressure loads

2010 ◽  
Vol 92 (2) ◽  
pp. 553-567 ◽  
Author(s):  
Zhi-Min Li ◽  
Zhong-Qin Lin
Keyword(s):  
Cylindrical Shell ◽  
External Pressure ◽  
Linear Buckling ◽  
Non Linear ◽  
Shear Deformable ◽  
Laminated Cylindrical Shell

Postbuckling of Shear Deformable Geodesically Stiffened Anisotropic Laminated Cylindrical Shell Under External Pressure

2011 ◽  
Vol 133 (2) ◽  
Author(s):  
Zhi-Min Li ◽  
Zhong-Qin Lin ◽  
Guan-Long Chen
Keyword(s):  
Cylindrical Shell ◽  
Perturbation Technique ◽  
Circumferential Stress ◽  
External Pressure ◽  
Equilibrium Path ◽  
Postbuckling Behavior ◽  
Singular Perturbation Technique ◽  
Stiffened Shells ◽  
Shear Deformable ◽  
Laminated Cylindrical Shell

A boundary layer theory for buckling and postbuckling of anisotropic laminated thin shells is extended to shear deformable stiffened anisotropic laminated shells. A postbuckling behavior is investigated for a shear deformable anisotropic laminated cylindrical shell with geodesical stiffener of finite length subjected to lateral or hydrostatic pressure. The material of each layer of the shell is assumed to be linearly elastic, anisotropic, and fiber-reinforced. The governing equations are based on a higher-order shear deformation shell theory with von Kármán–Donnell-type of kinematic nonlinearity and including the extension/twist, extension/flexural, and flexural/twist couplings. The nonlinear prebuckling deformations and initial geometric imperfections of the shell are both taken into account. A singular perturbation technique is employed to determine the buckling pressure and postbuckling equilibrium paths. The numerical illustrations concern the postbuckling response of perfect and imperfect, moderately thick, geodesically stiffened shells, axial and ring stiffened shells, and unstiffened shells with different values of shell parameters and stacking sequence. The results confirm that there exists a circumferential stress along with an associate shear stress when the shell is subjected to lateral pressure. The postbuckling equilibrium path is stable for the moderately long shell under external pressure and the shell structure is virtually imperfection-insensitive.

scholarly journals Non-linear buckling analysis of functionally graded shallow spherical shells

2009 ◽  
Vol 31 (1) ◽  
pp. 17-30 ◽  
Author(s):  
Dao Huy Bich
Keyword(s):  
External Pressure ◽  
Buckling Analysis ◽  
Functionally Graded ◽  
Power Law Distribution ◽  
Governing Equations ◽  
Spherical Shells ◽  
Buckling Loads ◽  
Linear Buckling ◽  
Non Linear ◽  
Linear Buckling Analysis

In the present paper the non-linear buckling analysis of functionally graded spherical shells subjected to external pressure is investigated. The material properties are graded in the thickness direction according to the power-law distribution in terms of volume fractions of the constituents of the material. In the formulation of governing equations geometric non-linearity in all strain-displacement relations of the shell is considered. Using Bubnov-Galerkin's method to solve the problem an approximated analytical expression of non-linear buckling loads of functionally graded spherical shells is obtained, that allows easily to investigate stability behaviors of the shell.

VD Vacuum Furnace Shell’s Buckling Numerical Analysis Based on Ansys

2011 ◽  
Vol 201-203 ◽  
pp. 805-809
Author(s):  
Zhan Gao ◽  
Xiang Dong Liu ◽  
Qing Ming Huang
Keyword(s):  
Numerical Analysis ◽  
External Pressure ◽  
Buckling Load ◽  
Vacuum Furnace ◽  
Fe Model ◽  
Lateral Instability ◽  
Maximum Displacement ◽  
Linear Buckling ◽  
Non Linear ◽  
Design Requirements

Take VD furnace’s shell as research object, using ANSYS FEM study its stability character. The furnace body and cover’s 3D and FE model were established separately. Model’s eigenvalue buckling were analyzed at 20°C and 200°C , on the basis of this, considering structure’s initial disfigurement and material’s nonlinearity, furnace body and cover’s double non-Linear Buckling Load under external pressure were calculated. The result shows that furnace body’s double non-Linear Buckling Load are 1.44 MPa and 0.96 MPa at the normal temperature and 200°C separately, and its appeared 7 wave-number’s lateral instability; The furnace cover’s double Non-Linear Buckling Load are 2.07MPa and 1.23 MPa at the normal temperature and 200°C separately, maximum displacement on the roof and near vacuum duct position. The furnace body and cover’s stability under 20°C and 200°C satisfied design requirements. The calculate results provide the theory basis for VD vacuum furnace’s physical design.

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