Free vibration behavior of laminated composite panel with center circular cutout

2021 ◽  
Author(s):  
S. K. Chaudhary ◽  
V. R. Kar ◽  
K. K Shukla
Keyword(s):  
Free Vibration ◽  
Laminated Composite ◽  
Composite Panel ◽  
Vibration Behavior ◽  
Circular Cutout

Free vibration behavior of corrugated functionally graded composite panel

2020 ◽  
Vol 22 ◽  
pp. 2957-2963
Author(s):  
Abhilash Karakoti ◽  
Satyasreet Jena ◽  
Vishesh Ranjan Kar ◽  
Kandasamy Jayakrishna
Keyword(s):  
Free Vibration ◽  
Functionally Graded ◽  
Composite Panel ◽  
Functionally Graded Composite ◽  
Vibration Behavior

Free Vibration Behavior of Angle-Ply Laminated Composite Stiffened Plates

2021 ◽  
pp. 2150187
Author(s):  
Leena Sinha ◽  
Amaresh Tripathy ◽  
Amar N. Nayak ◽  
Shishir K. Sahu
Keyword(s):  
Free Vibration ◽  
Numerical Investigation ◽  
Natural Frequencies ◽  
Laminated Composite ◽  
Mode Shapes ◽  
Stiffened Plates ◽  
Vibration Behavior ◽  
Fundamental Frequencies ◽  
Aspect Ratios ◽  
Support Conditions

This paper reports for the first time the experimental investigation on the free vibration characteristics of angle-ply laminated composite stiffened plates along with the numerical investigation. The natural frequencies of these plates are computed experimentally using an FFT analyzer and numerically by employing the finite element method with combination of isoparametric nine nodded plate and three nodded beam elements. Angle-ply laminated stiffened plates are fabricated using woven glass fiber fabrics and epoxy by hand layup technique. The effects of various support conditions; number, orientation and types of stiffeners; aspect ratios of plates and different fiber orientations on the fundamental frequencies of the angle-ply laminated stiffened plates are investigated. These parameters significantly influence the natural frequencies. It is found that there is a very good agreement observed between the fundamental frequencies obtained from both experimental and numerical investigation. Mode shapes are also presented for angle-ply laminated square stiffened plates with three different support conditions to justify the trend of increasing/decreasing of the modal frequency with the addition of stiffeners. It is observed that the enhancement of the frequencies of the angle-ply plates due to addition of stiffeners is influenced significantly by the position of stiffeners and consequently mode shapes. As the research on the free vibration behavior of angle-ply stiffened plates with experimental analysis is very rare, this study can be considered as the benchmark for future research.

scholarly journals Free vibration behavior of laminated composite stiffened elliptic parabolic shell panel with cutout

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Sarmila Sahoo
Keyword(s):  
Free Vibration ◽  
Laminated Composite ◽  
Beam Element ◽  
Isoparametric Element ◽  
Vibration Behavior ◽  
Curved Beam Element ◽  
Edge Conditions ◽  
Practical Engineering ◽  
Shell Panel ◽  
Parabolic Shell

AbstractIn this paper free vibration behavior of laminated composite stiffened elliptic parabolic shell has been analyzed in terms of natural frequency and mode shape. Finite element method has been applied using an eight-noded curved quadratic isoparametric element for shell with a three noded curved beam element for stiffener. Cross and angle ply shells with different edge conditions have been studied varying the size and position of the cutouts to arrive at a set of inferences of practical engineering significances.

Investigation on the free vibration behavior of sandwich conical shells with reinforced cores

2021 ◽  
pp. 109963622110204
Author(s):  
Mehdi Zarei ◽  
Gholamhossien Rahimi ◽  
Davoud Shahgholian-Ghahfarokhi
Keyword(s):  
Free Vibration ◽  
Orientation Angle ◽  
Element Model ◽  
Filament Winding ◽  
Vertex Angle ◽  
Sandwich Shell ◽  
Cross Sectional ◽  
Conical Shells ◽  
Vibration Behavior ◽  
Axial Forces

The free vibration behavior of sandwich conical shells with reinforced cores is investigated in the present study using experimental, analytical, and numerical methods. A new effective smeared method is employed to superimpose the stiffness contribution of skins with those of the stiffener in order to achieve equivalent stiffness of the whole structure. The stiffeners are also considered as a beam to support shear forces and bending moments in addition to the axial forces. Using Donnell’s shell theory and Galerkin method, the natural frequencies of the sandwich shell are subsequently derived. To validate analytical results, experimental modal analysis (EMA) is further conducted on the conical sandwich shell. For this purpose, a method is designed for manufacturing specimens through the filament winding process. For more validation, a finite element model (FEM) is built. The results revealed that all the validations were in good agreement with each other. Based on these analyses, the influence of the cross-sectional area of the stiffeners, the semi-vertex angle of the cone, stiffener orientation angle, and the number of stiffeners are investigated as well. The results achieved are novel and can be thus employed as a benchmark for further studies.

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