Dynamic instability analysis of laminated composite stiffened shell panels subjected to in-plane harmonic edge loading

2006 ◽  
Vol 22 (4) ◽  
pp. 483-510 ◽  
Author(s):  
S.N. Patel ◽  
P.K. Datta ◽  
A.H. Sheikh
Keyword(s):  
Dynamic Instability ◽  
Laminated Composite ◽  
Instability Analysis ◽  
Stiffened Shell ◽  
Edge Loading

EFFECT OF HARMONIC IN-PLANE EDGE LOADING ON DYNAMIC STABILITY OF STIFFENED SHELL PANELS WITH CUTOUTS

2010 ◽  
Vol 02 (04) ◽  
pp. 759-785 ◽  
Author(s):  
S. N. PATEL ◽  
P. K. DATTA ◽  
A. H. SHEIKH
Keyword(s):  
Dynamic Instability ◽  
Shell Element ◽  
Stiffened Panels ◽  
Stiffened Shell ◽  
Curved Beam Element ◽  
Load Factors ◽  
Edge Loading ◽  
Instability Regions ◽  
Degenerated Shell Element ◽  
Shell Geometry

The effect of non-uniform in-plane pulsating edge loading on dynamic instability behavior of perforated stiffened shell panels is presented in this paper using finite element method. The eight-noded isoparametric degenerated shell element and a compatible three-noded curved beam element are used to model the shell panels and the stiffeners, respectively. Bolotin method is applied to analyze the dynamic instability regions. Numerical results of convergence studies are presented and comparison is made with the published results from the literature. The effects of various parameters like shell geometry, loading type, cutout size and dynamic load factors are considered in dynamic instability analysis of stiffened shell panels with cutout. The buckling results of the cutout stiffened panels are also presented.

Buckling and dynamic instability analysis of stiffened shell panels

2006 ◽  
Vol 44 (3) ◽  
pp. 321-333 ◽  
Author(s):  
S.N. Patel ◽  
P.K. Datta ◽  
A.H. Sheikh
Keyword(s):  
Dynamic Instability ◽  
Instability Analysis ◽  
Stiffened Shell

Dynamic Stability Analysis of Stiffened Shell Panels With Cutouts

2009 ◽  
Vol 76 (4) ◽  
Author(s):  
S. N. Patel ◽  
P. K. Datta ◽  
A. H. Sheikh
Keyword(s):  
Degrees Of Freedom ◽  
Dynamic Instability ◽  
Torsional Rigidity ◽  
Shell Element ◽  
Beam Element ◽  
Radius Of Curvature ◽  
Efficient Manner ◽  
Instability Analysis ◽  
Stiffened Shell ◽  
Degenerated Shell Element

A finite element dynamic instability analysis of stiffened shell panels with cutout subjected to uniform in-plane harmonic edge loading along the two opposite edges is presented in this paper. The eight-noded isoparametric degenerated shell element and a compatible three-noded curved beam element are used to model the shell panels and the stiffeners, respectively. As the usual formulation of degenerated beam element is found to overestimate the torsional rigidity, an attempt has been made to reformulate it in an efficient manner. Moreover the new formulation for the beam element requires five degrees of freedom per node as that of shell element. Bolotin method is applied to analyze the dynamic instability regions. Numerical results of convergence studies are presented and comparison is made with the published results from literature. The effects of various parameters such as shell geometry, radius of curvature, cutout size, stiffening scheme, and dynamic load factors are considered in dynamic instability analysis of stiffened shell panels with cutout. The free vibration and static stability (buckling) results are also presented. With the consideration of radius of curvatures the panels reduce from deep shell case to shallow shell case and finally become flat plate.

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