FREE VIBRATION CHARACTERISTICS OF LAMINATED COMPOSITE JOINED CONICAL-CYLINDRICAL SHELLS

2000 ◽  
Vol 237 (5) ◽  
pp. 920-930 ◽  
Author(s):  
B.P. PATEL ◽  
M. GANAPATHI ◽  
S. KAMAT
Keyword(s):  
Free Vibration ◽  
Cylindrical Shells ◽  
Laminated Composite ◽  
Vibration Characteristics

Free vibration characteristics of delaminated composite pretwisted stiffened cylindrical shell

2017 ◽  
Vol 232 (4) ◽  
pp. 595-611 ◽  
Author(s):  
Mrutyunjay Rout ◽  
Sasank Shekhara Hota ◽  
Amit Karmakar
Keyword(s):  
Free Vibration ◽  
Dynamic Equilibrium ◽  
Twist Angle ◽  
Cylindrical Shells ◽  
Shell Element ◽  
Vibration Characteristics ◽  
Mode Shapes ◽  
Iteration Algorithm ◽  
Lagrange’S Equation ◽  
Benchmark Solutions

Effects of delamination on free vibration characteristics of laminated stiffened cylindrical shells with pretwist are analyzed by finite element method. The investigation is carried out using an eight-noded quadratic isoparametric shell element, which incorporates the transverse shear deformation and rotary inertia along with a three-noded beam element for the stiffener. The multipoint constraint algorithm has been included to guarantee the compatibility of deformation, equilibrium of resultant forces, and moments at delamination crack tip. The general dynamic equilibrium equation is derived from Lagrange’s equation of motion for moderate rotational speeds for which the Coriolis effect is neglected. The standard eigenvalue problem is solved utilizing QR iteration algorithm. The accuracy of the present formulation is validated with benchmark solutions is available in the literature. The present work concerns about the effects of delamination, fiber orientation, twist angle, stiffener depth-to-shell thickness ratio, and rotational speed on the fundamental frequency of shallow cylindrical shells with stiffener. Representative mode shapes for some typical case of the stiffened shell for different twist angles and rotational speeds are also presented.

Free-vibration Characteristics of Laminated Angle-ply Non-circular Cylindrical Shells

2003 ◽  
Vol 54 (4) ◽  
pp. 429-442 ◽  
Author(s):  
M. Ganapathi ◽  
B. P. Patel ◽  
S. S. Gupta ◽  
K. N. Khatri ◽  
C. T. Sambandam ◽  
...  
Keyword(s):  
Free Vibration ◽  
Cylindrical Shells ◽  
Vibration Characteristics ◽  
Circular Cylindrical Shells
Sign in / Sign up

Export Citation Format

Share Document