Critical Buckling Pressure of layered Orthotropic Cylinders with Stiffened ends under External Hydrostatic Pressure
10/12/12
The basis of calculation for the various loadings is derived from NASA SP-8007
(Ref. 11.4). In addition, the interpretation of NASA SP-8007 found in The
Behavior of Structures Composed ofComposite Materials was referenced
(Ref. 9.1, pp. 161-169.)
REQUIRED:     
Find the Critcal Buckling Pressure for a given external hydrostatic pressure.  
ASSUME:
1.  All lamina (layers) are the same material.  
GIVEN:  
Cylinder Radius (inside ??):  

Cylinder Length:    

Number of Layers:    

Lamina thickness:   

SOLUTION:
Lamina Properties:  

Stiffness Matrix Quantities:   

Direction Transformations:    
Where:  

Shell Thickness:   

Mean Radius of Shell (Rn):  

Lamina distances from Mean Radius  (h):  

Elastic Constants (for stiffened multilayered Orthotropic Cylinders):     
(A11) 

Determinate Coeff's:   

(Eq. #40 pp17)  ?????

(Eq. 5.53  pp163)  ???

Section 4.3.3  External Preassure  (pp19):   

Critical Buckling Press.:  

Min. Buckling Press.: