Free vibration of laminated composite conical shells with random material properties

2007 ◽  
Vol 81 (1) ◽  
pp. 96-104 ◽  
Author(s):  
Vivek Tripathi ◽  
B.N. Singh ◽  
K.K. Shukla
Keyword(s):  
Free Vibration ◽  
Material Properties ◽  
Laminated Composite ◽  
Conical Shells ◽  
Random Material Properties

Hygrothermal Buckling Response of Laminated Composite Plates with Random Material Properties: Micro-Mechanical Model

2011 ◽  
Vol 110-116 ◽  
pp. 113-119 ◽  
Author(s):  
Rajesh Kumar ◽  
Dharamveer Singh
Keyword(s):  
Material Properties ◽  
Plate Theory ◽  
Perturbation Technique ◽  
Micromechanical Model ◽  
Laminated Composite ◽  
Composite Plates ◽  
Second Order Statistics ◽  
Operational Life ◽  
Safety And Reliability ◽  
Random Material Properties

The aim of this paper is to find out the randomness in the material properties on the buckling of laminated composite plate needed for the economy, safety and reliability of the structures and components in their operational life especially for sensitive Aerospace Engineering applications in hygrothermal environments. Micromechanical model has been taken for the analysis .The used methodology is a C0 finite element method based on higher-order shear deformation plate theory for deriving the standard eigenvalue problem. A Taylor series based mean-centered first order perturbation technique is used to find out the second order statistics of the hygrothermal buckling loads under different sets of environmental conditions..The numerical results for deterministic parameters are compared and validated with available literature and random parameters with independent Monte Carlo Simulation. The result shows that the plate is significantly affected by the hygrothermal buckling load.

Optimization of Joined Conical Shells Based on Free Vibration

2016 ◽  
Author(s):  
Rayehe Karimi Mahabadi ◽  
Firooz Bakhtiari-Nejad
Keyword(s):  
Genetic Algorithm ◽  
Free Vibration ◽  
Natural Frequency ◽  
Conical Shell ◽  
Fibre Orientation ◽  
Laminated Composite ◽  
Conical Shells ◽  
Design Variables

This work aims at utilizing genetic algorithm (GA) to pursue the optimization of joined conical shells based on free vibration. Semi-vertex angles of cones and fibre orientation of the laminated composite are considered as design variables. First, the model is simulated in ABAQUS, the model is validated by comparing its results to other obtained from the literature. Then the first non-zero natural frequency of isotropic joined conical shell is maximized by changing the two semi-vertex angles of cones. Last the fibre orientation of laminated joined shells are optimized to achieve the maximum natural frequency.

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