Free Vibration Analysis for Polyester/Graphene Nanocomposites Multilayer Functionally Graded Plates

Shahad Qusi Abd Alqader; Bashar Owaid Bedaiwi; Emad Kadum Njim; Ayad M. Takhakh; Lazreg Hadji

doi:10.15330/pcss.25.4.704-717

Authors

Shahad Qusi Abd Alqader Mechanical Engineering Department, College of Engineering, Mustansiriyah University, Baghdad, Iraq
Bashar Owaid Bedaiwi Mechanical Engineering Department, College of Engineering, Mustansiriyah University, Baghdad, Iraq
Emad Kadum Njim Ministry of Industry and Minerals, State Company for Rubber and Tires Industries, Iraq
Ayad M. Takhakh Mechanical Engineering Department, College of Engineering, Al-Nahrain University, Baghdad,Iraq
Lazreg Hadji Department of Mechanical Engineering, University of Tiaret, Tiaret, Algeria

DOI:

https://doi.org/10.15330/pcss.25.4.704-717

Keywords:

FGM, Nanocomposite structure, Geometrical Properties, Natural frequency, ABAQUS

Abstract

In the current work, an FGM nanocomposite made of multi-layers of graphene nanoparticles and a polyester-based matrix was constructed using the molds with a hand lay-up technique to attain an accurate shape and reduce defects in the final product. The desired models have four, six, and 11 layers and different volume fractions of nanoparticles (0.5, 1, 2, 3, 4, and 5%). This study conducted various experimental tests to analyze the free vibration characteristics of functionally graded composite sandwich rectangular structures with simply supported boundary conditions to evaluate the significance of hole number and cutout location in fundamental frequencies. For holes, three types are used (2, 4, and 6) holes with a 10 mm diameter, while for cutouts, three geometrical designs are used (circular, rectangular, and triangular) with various aspect ratios (r = 1, 1.5, 2, and 2.5).

A numerical study was carried out to validate the experimental solution, employing modal analysis and finite element analysis (FEA) using ABAQUS software tools. From the findings, the experimental findings and numerical calculations exhibit a satisfactory level of concurrence, displaying a maximum discrepancy of 9.5%. The results show that the fundamental frequency decreases by increasing the cutouts' aspect ratio (r=a/b). There is minimal variation between r =1 and r= 1.5, but a noticeable decrease is observed at an aspect ratio of r= 2.5. This difference is primarily influenced by the type of material gradient and the number of holes, specifically for a given thickness of the functionally graded (FG) plates.

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