Elastic Wave Propagation in Laminated Composite Plates

1991 ◽  
Vol 113 (4) ◽  
pp. 411-418 ◽  
Author(s):  
W. M. Karunasena ◽  
R. L. Bratton ◽  
S. K. Datta ◽  
A. H. Shah
Keyword(s):  
Analytical Method ◽  
Guided Waves ◽  
Laminated Composite ◽  
Composite Plates ◽  
Thickness Variation ◽  
Dispersion Characteristics ◽  
Laminated Plate ◽  
Laminated Composite Plates ◽  
Number Of Layers ◽  
Stiffness Method

A stiffness method and an analytical method have been used to study the dispersion characteristics of guided waves in laminated composite plates. Both cross-ply and angle-ply plates have been considered in the analysis. The objective of the study is to analyze the effect of fiber orientation, ply layout configuration, and number of layers on the dispersion characteristics. A Rayleigh-Ritz type of approximation of the through-thickness variation of the displacements that maintain continuity of displacements and tractions at the interfaces between the layers has been used in the stiffness method. The analytical method solves the exact dispersion relation of the laminated plate by using the Muller’s method with initial guesses obtained through the stiffness method. Both methods are applicable to plates with arbitrary number of layers having distinct mechanical properties. Numerical results presented show strong influence of anisotropy on the guided waves.

Natural Frequency of Laminated Composite Plates Using a Sinusoidal Theory

2014 ◽  
Vol 709 ◽  
pp. 148-152
Author(s):  
Guo Qing Zhou ◽  
Ji Wang ◽  
Song Xiang
Keyword(s):  
Differential Equations ◽  
Analytical Method ◽  
Deformation Theory ◽  
Natural Frequencies ◽  
Shear Deformation Theory ◽  
Laminated Composite ◽  
Composite Plates ◽  
Laminated Composite Plates ◽  
Simply Supported ◽  
Sinusoidal Shear Deformation Theory

Sinusoidal shear deformation theory is presented to analyze the natural frequencies of simply supported laminated composite plates. The governing differential equations based on sinusoidal theory are solved by a Navier-type analytical method. The present results are compared with the available published results which verify the accuracy of sinusoidal theory.

An analytical method for 3-D analysis of circular laminated composite plates

1996 ◽  
Vol 117 (1-4) ◽  
pp. 191-203
Author(s):  
X. Jiang ◽  
X. Zhang ◽  
B. Cheng
Keyword(s):  
Analytical Method ◽  
Laminated Composite ◽  
Composite Plates ◽  
Laminated Composite Plates

Effect of Orientation Angle on Acoustic Radiation Mode Amplitudes of Laminated Composite Plates

2014 ◽  
Vol 621 ◽  
pp. 3-6
Author(s):  
Jin Wu Wu ◽  
Hai Peng Yuan
Keyword(s):  
Finite Element ◽  
Acoustic Radiation ◽  
Orientation Angle ◽  
Laminated Composite ◽  
Composite Plates ◽  
Element Model ◽  
Laminated Plate ◽  
Laminated Composite Plates ◽  
Radiation Mode ◽  
Radiation Amplitude

In this paper, the acoustic radiation mode’s amplitudes of laminated composite plates are studied. The layer wise finite element model is imposed to determine velocity distributions of laminated composite plates. Based on the acoustic radiation mode, the effects of the panel orientation angle on the first three orders acoustic radiation mode’s amplitude of the laminated composite plates are then discussed. A twelve-layer laminated plate was used as an example, and the numerical simulations results show that the effects of the panel orientation angle on the acoustic radiation amplitude of the laminated composite plates are significant.

scholarly journals Elasto Buckling Behaviour Of Gfrp Laminated Plate With Central Holes

2011 ◽  
pp. 73-76
Author(s):  
Ganesan. C ◽  
P.K. Dash
Keyword(s):  
Laminated Composite ◽  
Composite Plates ◽  
Buckling Load ◽  
Laminated Plate ◽  
Laminated Composite Plates ◽  
Perforated Plates ◽  
The Past ◽  
Plate Elements ◽  
Circular Cutout ◽  
Two Sides

In various cases, it is roughly unavoidable to have holes in the plate elements for inspection, maintenance, and service purposes. In such cases, the presence of these holes redistributes the membrane stresses in the plates and may reduce their stability significantly. The buckling of such perforated plates has received the attention of many researchers over the past years. This paper deals with the buckling analysis of symmetrically and laminated composite plates under two sides simply supported and two sides free boundary condition. The effects on buckling load by various cut out shapes (circular, square and elliptical) and sizes are investigated. It was observed that the plate with the circular cutout yielded the greatest critical buckling load when compared with the square and elliptical cutouts.

Application of the Method of Reverberation Ray Matrix to the Early Short Time Transient Responses of Stiffened Laminated Composite Plates

2012 ◽  
Vol 79 (4) ◽  
Author(s):  
Feng-Ming Li ◽  
Chun-Chuan Liu ◽  
Sheng Shen ◽  
Wen-Hu Huang
Keyword(s):  
Dynamic Models ◽  
Shear Deformation Theory ◽  
Laminated Composite ◽  
Composite Plates ◽  
Laminated Plates ◽  
Laminated Plate ◽  
Laminated Composite Plates ◽  
Transient Responses ◽  
Transient Wave ◽  
Short Time

The method of reverberation ray matrix (MRRM) is extended to research the transient wave propagation and early short time transient responses of the stiffened laminated composite plates subjected to impact loads. The rib-stiffened laminated plates are modeled as the coupling systems in which the flexural motion for the laminated plate is considered, and the flexural and torsional motions are taken into account for the laminated stiffeners, which are modeled as the beams. The dynamic models of the laminated plates and beams in the Laplace phase space are established based on the first order shear deformation theory (FSDT). The reverberation ray matrix is determined by the continuous and boundary conditions of the stiffened laminated plate. The transient response corresponding to each ray group is calculated by the FFT algorithm. From the numerical results, it is seen that the early short time transient accelerations of the stiffened laminated plates are very large, while the early short time transient displacements are very small. Furthermore, the influences of the stiffeners and different impulse signals on the early short time transient responses of the stiffened laminated plates are also studied.

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.

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