Free vibration of composite cylindrical panels with random material properties

2002 ◽  
Vol 58 (4) ◽  
pp. 435-442 ◽  
Author(s):  
B.N Singh ◽  
D Yadav ◽  
N.G.R Iyengar
Keyword(s):  
Free Vibration ◽  
Material Properties ◽  
Cylindrical Panels ◽  
Random Material Properties

Static and Free Vibration Analysis of Structures Composed of Functionally Graded Material with Random Material Properties

2016 ◽  
Vol 857 ◽  
pp. 249-254
Author(s):  
Aswathy Komalan ◽  
Dhanya Krishnan
Keyword(s):  
Mechanical Properties ◽  
Free Vibration ◽  
Material Properties ◽  
Vibration Analysis ◽  
Structural Response ◽  
Free Vibration Analysis ◽  
Functionally Graded ◽  
Graded Materials ◽  
Graded Material ◽  
Random Material Properties

Functionally graded materials (FGMs) have mechanical properties that vary continuously from one phase to another within a confined volume. In general, these materials exhibit certain amount of scatter in their properties due to different factors. The dispersion in the response values of a structure is due to the scatter in the values of material properties and applied external load. For design purposes, it is essential to know the potential variations in the structural response due to the system material or external randomness. In the present work, free vibration and static analysis on FGM structures with material randomness are considered.

Structural Similitude for Prestressed Vibration and Buckling of Eccentrically Stiffened Circular Cylindrical Panels and Shells by Energy Approach

2016 ◽  
Vol 16 (10) ◽  
pp. 1550074 ◽  
Author(s):  
Wei Yu ◽  
Zheng Liang Li
Keyword(s):  
Free Vibration ◽  
Total Energy ◽  
Material Properties ◽  
Scaling Laws ◽  
Scaling Law ◽  
Structural System ◽  
The Real ◽  
Partial Similarity ◽  
Large Structures ◽  
Cylindrical Panels

The objective of this study is to develop and validate similitude requirements and scaling laws for studying the real characteristics of structures easily and economically, especially for large structures. The generalized similitude requirements and the scaling law of orthogonally stiffened cylindrical panels and shells for buckling and free vibration are derived by applying the similitude transformation to the total energy of the structural system directly. In practice, due to either the difficulty of satisfying all of the similitude requirements simultaneously or to save experimental cost and time, distorted models with partial similarity are necessarily employed and approximate scaling laws are proposed. The partial similitude is mainly investigated first by using specific formulas of stiffness parameters and corresponding scaling laws are given. Also discussed herein are particular models with relaxations in the material properties of stiffeners, the materials of both the skin and the stiffeners and the material properties and geometry. The obtained results indicate that the distorted models are able to accurately predict the behavior of the prototype.

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.

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