On free vibration of laminated skew sandwich plates: A finite element analysis

C. V. Srinivasa,Pavan Kumar Dhotre

doi:10.1515/nleng-2021-0006

Abstract

Abstract The present work emphasizes the determination of the fundamental frequency of skew sandwich plates with orthotropic core and laminated facings using different design parameters. Finite elements CQUAD4 and CQUAD8 of MSC/NASTRAN are used for obtaining fundamental frequencies, which are validated against available literature results. The influence of the skew angle, the ratio of the length-to total thickness (a/h) of the sandwich plate, and the ratio of the thickness of the core to face sheet (t c /t h ) on the fundamental frequency of skew sandwich plates are studied. Also, the influence of parameters such as the number of layers in the face sheet, laminate sequence, and fiber orientation angle on the fundamental frequency of laminated skew sandwich plates have been studied. It is found that the CQUAD8 element yields better results than the CQUAD4 element in the present study. The fundamental frequencies are found to increase with the increasing skew angle. The variation in fundamental frequency is negligible when the number of layers is large in the face sheet.

Highlights

Skew sandwich plates are a day frequently used in numerous areas like aeronautical, automobile, civil engineering, and in most structural applications
Quasi-3D shear deformation theory was employed for thermo-mechanical bending analysis of functionally graded material (FGM) sandwich plates [35] and buckling and the post-buckling response was recorded from functionally graded carbon nanotube (FG-CNT) - magnesium (Mg) nanocomposite plate with interphase e ect [31]
The present numerical study considers a variety of parameters, such as aspect ratio, a ratio of length to thickness of sandwich plates, ration thickness of face sheet to thickness of the core, skew angle, and boundary conditions of the sandwich skew plates

Summary

Introduction

Skew sandwich plates are a day frequently used in numerous areas like aeronautical, automobile, civil engineering, and in most structural applications. The in uence of parameters such as the number of layers in the face sheet, laminate sequence, and ber orientation angle on the fundamental frequency of laminated skew sandwich plates have been studied. A study dealing with the comparison of free vibration responses obtained from four theories on composite truss core sandwich plates were presented.

Results

Conclusion