Effect of ply-orientation and boundary conditions on the vibrational characteristics of laminated composite panels using HODST

In this research, buckling behavior of perforated rectangular plate of symmetric and anti-symmetric laminated composite is investigated based on Finite element analysis. The presence of hole may cause redistribution of stresses in plates with reduction of stability. The aim of the current paper is to find critical buckling load by using the (FSDT) first-order shear deformation theory in concomitance with the variational energy method. The load depends on many factors like as diameter of circular hole, different boundary conditions, lay-up sequences, length/thickness ratio and angle of ply orientation. The result is shown in graphical forms for various boundary conditions.

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Experimental and Numerical Analyses on the Buckling Characteristics of Woven Flax/Epoxy Laminated Composite Plate under Axial Compression

Polymers ◽

10.3390/polym13070995 ◽

2021 ◽

Vol 13 (7) ◽

pp. 995

Author(s):

Venkatachalam Gopalan ◽

Vimalanand Suthenthiraveerappa ◽

Jefferson Stanley David ◽

Jeyanthi Subramanian ◽

A. Raja Annamalai ◽

...

Keyword(s):

Environmental Sustainability ◽

Composite Plate ◽

Compressive Load ◽

Laminated Composite ◽

Green Composite ◽

Laminated Composite Plate ◽

Axial Compressive Load ◽

Number Of Layers ◽

Structural Applications ◽

Ply Orientation

The evolution of a sustainable green composite in various loadbearing structural applications tends to reduce pollution, which in turn enhances environmental sustainability. This work is an attempt to promote a sustainable green composite in buckling loadbearing structural applications. In order to use the green composite in various structural applications, the knowledge on its structural stability is a must. As the structural instability leads to the buckling of the composite structure when it is under an axial compressive load, the work on its buckling characteristics is important. In this work, the buckling characteristics of a woven flax/bio epoxy (WFBE) laminated composite plate are investigated experimentally and numerically when subjected to an axial compressive load. In order to accomplish the optimization study on the buckling characteristics of the composite plate among various structural criterions such as number of layers, the width of the plate and the ply orientation, the optimization tool “response surface methodology” (RSM) is used in this work. The validation of the developed finite element model in Analysis System (ANSYS) version 16 is carried out by comparing the critical buckling loads obtained from the experimental test and numerical simulation for three out of twenty samples. A comparison is then made between the numerical results obtained through ANSYS16 and the results generated using the regression equation. It is concluded that the buckling strength of the composite escalates with the number of layers, the change in width and the ply orientation. It is also noted that the weaving model of the fabric powers the buckling behavior of the composite. This work explores the feasibility of the use of the developed green composite in various buckling loadbearing structural applications. Due to the compromised buckling characteristics of the green composite with the synthetic composite, it has the capability of replacing many synthetic composites, which in turn enhances the sustainability of the environment.

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The study of the nonlinear vibration of S-S and C-C laminated composite conical shells on elastic foundations through an approximate method

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/09544062211021439 ◽

2021 ◽

pp. 095440622110214

Author(s):

Shahin Mohammadrezazadeh ◽

Ali Asghar Jafari

Keyword(s):

Boundary Conditions ◽

Nonlinear Vibration ◽

Approximate Method ◽

Laminated Composite ◽

Vertex Angle ◽

Nonlinear Frequency ◽

Conical Shells ◽

Elastic Foundations ◽

Vibration Responses ◽

Comparison Of The Results

This paper investigates the nonlinear vibration responses of laminated composite conical shells surrounded by elastic foundations under S-S and C-C boundary conditions via an approximate approach. The laminated composite conical shells are modeled based on classical shell theory of Love employing von Karman nonlinear theory. Nonlinear vibration equation of the conical shells is extracted by handling Lagrange method. The linear and nonlinear vibration responses are obtained via an approximate method which combines Lindstedt-Poincare method with modal analysis. The validation of this study is carried out through the comparison of the results of this study with results of published literature. The effects of several parameters including the constants of elastic foundations, boundary conditions, total thickness, length, large edge radius and semi-vertex angle on the values of fundamental linear frequency and curves of amplitude parameter versus nonlinear frequency ratio for laminated composite conical shells with both S-S and C-C boundary conditions are investigated.

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Buckling behaviour of laminated composite skew plates with various boundary conditions subjected to linearly varying in-plane edge loading

International Journal of Mechanical Sciences ◽

10.1016/j.ijmecsci.2015.06.018 ◽

2015 ◽

Vol 100 ◽

pp. 136-144 ◽

Cited By ~ 11

Author(s):

Abhinav Kumar ◽

S.K. Panda ◽

Rajesh Kumar

Keyword(s):

Boundary Conditions ◽

Laminated Composite ◽

Various Boundary Conditions ◽

Edge Loading

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Effect of Delamination on Natural Frequencies of E-glass and S-glass Epoxy Composite Plates

European Journal of Computational Mechanics ◽

10.13052/ejcm1779-7179.29466 ◽

2021 ◽

Author(s):

P. K. Karsh ◽

Bindi Thakkar ◽

R. R. Kumar ◽

Abhijeet Kumar ◽

Sudip Dey

Keyword(s):

Natural Frequencies ◽

Epoxy Composite ◽

Orientation Angle ◽

Laminated Composite ◽

Composite Plates ◽

Mode Shapes ◽

Transverse Shear Deformation ◽

The Finite Element Method ◽

Modes Of Failure ◽

Ply Orientation

The delamination is one of the major modes of failure occurring in the laminated composite due to insufficient bonding between the layers. In this paper, the natural frequencies of delaminated S-glass and E-glass epoxy cantilever composite plates are presented by employing the finite element method (FEM) approach. The rotary inertia and transverse shear deformation are considered in the present study. The effect of parameters such as the location of delamination along the length, across the thickness, the percentage of delamination, and ply-orientation angle on first three natural frequencies of the cantilever plates are presented for S-glass and E-glass epoxy composites. The standard eigenvalue problem is solved to obtain the natural frequencies and corresponding mode shapes. First three mode shape of S-Glass and E-Glass epoxy laminated composites are portrayed corresponding to different ply angle of lamina.

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Properties of Laminated Composite Panels Made from Fast-Growing Species Glued with Mangium Tannin Adhesive

BioResources ◽

10.15376/biores.11.3.5949-5960 ◽

2016 ◽

Vol 11 (3) ◽

Cited By ~ 3

Author(s):

Jessica Hendrik ◽

Yusuf Sudo Hadi ◽

Muh Yusram Massijaya ◽

Adi Santoso

Keyword(s):

Laminated Composite ◽

Composite Panels ◽

Tannin Adhesive ◽

Fast Growing ◽

Fast Growing Species

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Vibration Analysis of Laminated Composite Rectangular Plates With General Boundary Conditions

ASME 2018 Noise Control and Acoustics Division Session presented at INTERNOISE 2018 ◽

10.1115/ncad2018-6106 ◽

2018 ◽

Cited By ~ 1

Author(s):

Yu Fu ◽

Jianjun Yao ◽

Zhenshuai Wan ◽

Gang Zhao

Keyword(s):

Boundary Conditions ◽

Vibration Analysis ◽

Ritz Method ◽

Laminated Composite ◽

Free Vibration Analysis ◽

Geometric Parameters ◽

General Boundary ◽

Rectangular Plates ◽

General Boundary Conditions ◽

Benchmark Solutions

In this investigation, the free vibration analysis of laminated composite rectangular plates with general boundary conditions is performed with a modified Fourier series method. Vibration characteristics of the plates have been obtained via an energy function represented in the general coordinates, in which the displacement and rotation in each direction is described as an improved form of double Fourier cosine series and several closed-form auxiliary functions to eliminate any possible jumps and boundary discontinuities. All the expansion coefficients are then treated as the generalized coordinates and determined by Rayleigh-Ritz method. The convergence and reliability of the current method are verified by comparing with the results in the literature and those of Finite Element Analysis. The effects of boundary conditions and geometric parameters on the frequencies are discussed as well. Finally, numerous new results for laminated composite rectangular plates with different geometric parameters are presented for various boundary conditions, which may serve as benchmark solutions for future research.

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