A refined first-order piecewise shear deformation model for vibration analysis of composite sandwich plates

Abstract

In this paper, for reducing the number of independent generalized displacements of the traditional piecewise model to decrease the number of vibration equations, a refined piecewise shear deformation model considering the effect of rotary inertias and shear deformation for vibration analysis of laminated composite and sandwich plates is presented. Unlike the conventional piecewise model, the significant novelty of the proposed theory is that the new proposed piecewise theory reduces the number of independent generalized displacements from 9 to 8. Some relevant assumptions, dividing the transverse displacement into bending and shear parts, are introduced into the traditional piecewise model, and the displacement fields of the refined piecewise shear deformation theory are obtained. Next, the governing equations are derived by employing Hamilton’s principle and solved by the closed-form Navier method. Then, the present solutions are compared with those available in the previous literature for confirming their validity. Finally, the variations of frequencies and loss factors with system parameters are evaluated and presented graphically.

Keywords:

• Refined piecewise displacement model
• composite
• sandwich plates
• vibration analysis
• first-order shear deformation theory

Acknowledgments

The authors would like to thank the reviewers for their constructive comments.

Data availability statement

The raw/processed data used to support the findings of this study are included in the article.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (51705270).