Buckling Analysis of Ring-Stiffened Laminated Composite Cylindrical Shells by Fourier-Expansion Based Differential Quadrature Method

2012 ◽  
Vol 225 ◽  
pp. 207-212 ◽  
Author(s):  
Saeed Barani ◽  
Davood Poorveis ◽  
Shapoor Moradi
Keyword(s):  
Fourier Expansion ◽  
Differential Quadrature Method ◽  
Cylindrical Shells ◽  
Laminated Composite ◽  
Longitudinal Direction ◽  
Buckling Analysis ◽  
Differential Quadrature ◽  
Quadrature Method ◽  
First Order ◽  
Finite Element Software

This article focuses on the application of the Fourier-expansion based differential quadrature method (FDQM) for the buckling analysis of ring-stiffened composite laminated cylindrical shells. Displacements and rotations are expressed in terms of Fourier series expansions in longitudinal direction and their first order derivatives are approximated with FDQM in circumferential direction. The 'smeared stiffener' approach is adopted for the stiffeners modeling. Two FORTRAN programs prepared for linear and nonlinear analysis and results were compared by ABAQUS finite element software. Buckling loads of stiffened and unstiffened shells considering the effects of changes in shell and stiffener geometric and material properties and also shell lay-ups are investigated.

An approach in deformation and stress analysis of elasto-plastic sandwich cylindrical shell panels based on harmonic differential quadrature method

2016 ◽  
Vol 19 (2) ◽  
pp. 167-191 ◽  
Author(s):  
H Shokrollahi ◽  
F Fallah ◽  
MH Kargarnovin
Keyword(s):  
Cylindrical Shell ◽  
Differential Quadrature Method ◽  
Differential Quadrature ◽  
Core Material ◽  
Quadrature Method ◽  
Sandwich Shell ◽  
Finite Element Software ◽  
The Core ◽  
Harmonic Differential Quadrature Method ◽  
Shell Panel

Using harmonic differential quadrature method, an approach to analyze sandwich cylindrical shell panels with any sort of boundary conditions under a generally distributed static loading, undergoing elasto-plastic deformation is proposed. The faces of the sandwich shell panel are made of some isotropic materials with linear work hardening behavior while the core is assumed to be an isotropic material experiencing only elastic behavior. The faces are modeled as thin cylindrical shells obeying the Kirchhoff–Love assumptions. For the core material, it is assumed to be thick and the in-plane stresses are negligible. Upon application of an inner and outer general lateral loading, the governing equations are derived using the principle of virtual displacements. Using an iterative approach, named elasto-plastic harmonic differential quadrature method (EP-HDQM), the equations are solved. The obtained results are compared with the results from finite element software Ansys for different sandwich shell panel configurations. Then, the effects of changing different parameters on the stress and displacement components of sandwich cylindrical shell panels in different elasto-plastic conditions are investigated.

Sign in / Sign up

Export Citation Format

Share Document