Free vibration characteristics of laminated composite stiffened plates: Experimental and numerical investigation

2020 ◽  
Vol 233 ◽  
pp. 111557 ◽  
Author(s):  
L. Sinha ◽  
S.S. Mishra ◽  
A.N. Nayak ◽  
S.K. Sahu
Keyword(s):  
Free Vibration ◽  
Numerical Investigation ◽  
Laminated Composite ◽  
Vibration Characteristics ◽  
Stiffened Plates

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 characteristics of stiffened plates

2018 ◽  
Vol 10 (2) ◽  
pp. 153-167 ◽  
Author(s):  
Amar N. Nayak ◽  
Laren Satpathy ◽  
Prasant K. Tripathy
Keyword(s):  
Free Vibration ◽  
Vibration Characteristics ◽  
Stiffened Plates

scholarly journals Effect of Moment of Inertia of Attached Mass on Natural Frequencies of Cantilevered Symmetrically Laminated Plates

2018 ◽  
Vol 1 (2) ◽  
pp. 35-39
Author(s):  
Kenji Hosokawa
Keyword(s):  
Free Vibration ◽  
Natural Frequencies ◽  
Laminated Composite ◽  
Composite Plates ◽  
Vibration Characteristics ◽  
Laminated Plates ◽  
Moment Of Inertia ◽  
Mode Shapes ◽  
Attached Mass ◽  
Structural Applications

Since composite materials such as laminated composite plates have high specific strength and high structural efficiency, they have been usedin many structural applications. It is therefore very important to make clear the vibration characteristics of the laminated plates for the designand the structural analysis. Especially, the vibration characteristics of the laminated plates with attached mass are essential. However, wecannot find the theoretical or experimental approaches for the free vibration of laminated plates with attached mass. In the present study, theexperimental and numerical approaches are applied to the free vibration of cantilevered symmetrically laminated plates with attached mass.First, by applying the experimental modal analysis technique to the cantilevered symmetrically laminated plates with attached mass, thenatural frequencies and mode shapes of the plates are obtained. Next, the natural frequencies and mode shapes of the cantileveredsymmetrically laminated plates with attached mass are calculated by Finite Element Method (FEM). Finally, from the experimental andnumerical results, the effect of the moment of inertia of the attached mass to the natural frequencies and mode shapes of the cantileveredsymmetrically laminated plates are clarified.

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