scholarly journals Dynamic Resonance of Curved Panels in Adverse Hygrothermal Environment

2013 ◽  
Vol 2013 ◽  
pp. 1-6
Author(s):  
Manoj Kumar Rath
Keyword(s):  
Finite Element Method ◽  
Boundary Condition ◽  
Finite Element ◽  
Elevated Temperatures ◽  
Composite Plates ◽  
Dynamic Loadings ◽  
Instability Regions ◽  
Hygrothermal Environment ◽  
Dynamic Resonance ◽  
Curved Panels

The present paper deals with the dynamic resonance of composite curved panels subjected to periodic dynamic loadings. The effects of various parameters of four-sided clamped composite curved panels at elevated temperatures and moisture concentrations on the principal instability regions are investigated by finite element method which is used to study the antisymmetric angle-ply square plates. The results show that instability of composite plates occurs for different parameters in adverse hygrothermal environment. The experimental and numerical investigation is also carried out for four-sided clamped boundary condition for vibration and buckling of curved panels in hygrothermal environment.

scholarly journals Parametric Instability of Square Laminated Plates in Hygrothermal Environment

2013 ◽  
Vol 2013 ◽  
pp. 1-6
Author(s):  
Manoj Kumar Rath ◽  
Shishir Kumar Sahu
Keyword(s):  
Elevated Temperatures ◽  
Dynamic Instability ◽  
Parametric Instability ◽  
Composite Plates ◽  
Laminated Plates ◽  
Load Factor ◽  
Dynamic Loadings ◽  
Instability Regions ◽  
Hygrothermal Environment ◽  
Dynamic Load Factor

The present paper investigates the parametric instability of square laminated plates subjected to periodic dynamic loadings in hygrothermal environment. The effects of various parameters like the increase in static load factor and the degree of orthotropy of simply supported composite plates at elevated temperatures and moisture concentrations on the principal instability regions are investigated using finite element method. The effects of transverse shear deformation and rotary inertia are used to study the antisymmetric angle-ply square plates. A simple laminated plate model is developed for the parametric instability of square laminated plates subjected to hygrothermal loading. A computer program based on FEM in MATLAB environment is developed to perform all necessary computations. The results show that instability of square laminated plates occurs for different parameters with an increase in temperature and moisture environment. The onset of instability occurs earlier, and the width of dynamic instability regions increases with a rise in temperature and moisture for different parameters. The effect of damping shows that there is a finite critical value of dynamic load factor for each instability region below which the square laminated plates cannot become unstable.

PARAMETRIC RESONANCE OF WOVEN FIBER LAMINATED COMPOSITE PLATES IN ADVERSE HYGROTHERMAL ENVIRONMENT

2012 ◽  
Vol 04 (04) ◽  
pp. 1250016
Author(s):  
M. K. RATH ◽  
S. K. SAHU
Keyword(s):  
Elevated Temperatures ◽  
Parametric Instability ◽  
Laminated Composite ◽  
Composite Plates ◽  
Laminated Composite Plates ◽  
Simply Supported ◽  
Number Of Layers ◽  
Dynamic Loadings ◽  
Instability Regions ◽  
Hygrothermal Environment

The present study deals with the parametric instability of woven fiber laminated composite plates subjected to periodic dynamic loadings in adverse hygrothermal environment. The effects of various parameters like increase in number of layers and lamination angle of simply supported composite plates at elevated temperatures and moisture concentrations on the principal instability regions are investigated using finite element method. The effects of transverse shear deformation and rotary inertia, is used to study the anti-symmetric angle-ply square plates. The results show that instability of woven fiber laminated composite plates occurs for different parameters with increase in adverse temperature and moisture environment.

Dynamic Instability of Delaminated Composite Plates under Parametric Excitation

2006 ◽  
Vol 326-328 ◽  
pp. 1765-1768 ◽  
Author(s):  
Meng Kao Yeh ◽  
Kuei Chang Tung
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Parametric Excitation ◽  
Composite Plate ◽  
Dynamic Instability ◽  
Composite Plates ◽  
Modal Parameters ◽  
The Finite Element Method ◽  
Electromagnetic Device ◽  
Instability Regions

The dynamic instability behavior of delaminated composite plates under transverse excitations was investigated experimentally and analytically. An electromagnetic device, acting like a spring with alternating stiffness, was used to parametrically excite the delaminated composite plates transversely. An analytical method, combined with the finite element method, was used to determine the instability regions of the delaminated composite plates based on the modal parameters of the composite plate and the position, the stiffness of the electromagnetic device. The delamination size and position of composite plates were varied to assess their effects on the excitation frequencies of simple and combination resonances in instability regions. The experimental results were found to agree with the analytical ones.

The Strain Energy Tuning of the Shape Memory Alloy on the Post-Buckling of Composite Plates Using Finite Element Method

2012 ◽  
Vol 445 ◽  
pp. 577-582
Author(s):  
Zainudin A. Rasid ◽  
Saiful Amri Mazlan ◽  
Amran Ayob ◽  
Rizal Zahari ◽  
Dayang Laila Majid ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Strain Energy ◽  
Composite Plates ◽  
Post Buckling ◽  
Energy Tuning ◽  
Element Method
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