Free Vibration and Instability Analysis of Sandwich Plates with Carbon Nanotubes-Reinforced Composite Faces and Honeycomb Core

Abstract

In this study, the instability regions of a honeycomb sandwich plate are investigated for different end conditions under periodic in-plane loading. The core layer of the sandwich plate is made of carbon nanotube (CNT)/glass fiber-reinforced honeycomb and the face layers of CNT/glass fiber- reinforced laminated composite. The governing equations are derived using classical laminated plate theory (CLPT) and solved numerically by using finite element formulation. The effectiveness of the developed finite element formulation is demonstrated by comparing the results in terms of natural frequencies with those available in the literature. The effects of CNT wt.% on the core material, CNT wt.% on the skin material, ply orientation and various end conditions on the variation of natural frequencies, loss factors and instability regions are studied. Finally, some inferences for the effects of CNT reinforcement on the honeycomb sandwich plate subjected to the periodic in-plane loads are discussed.

Influence of multi‐walled carbon nanotubes reinforced honeycomb core on vibration and damping responses of carbon fiber composite sandwich shell structures

“…It can be observed that the natural frequencies and loss factors of all the modes of the MWCNT/GFRP honeycomb sandwich spherical shell are increased significantly compared with the honeycomb sandwich shell structure (without MWCNT reinforcement) under various end conditions. A similar pattern was also seen in Chowdhary et al [ 34 ] for honeycomb plate structures. This is because of the strong interaction between MWCNT and honeycomb which contributes to an enhancement in the shear characteristics of the MWCNT reinforced honeycomb core.…”

Effect of carbon nanotubes reinforcement on eigenmodes of multi‐smart core sandwich composite cylindrical shell panels

“…After the mixing process, the room temperature vulcanizing silicone rubber (A) and catalyst (B) were added into the CNT/SO mixture followed by stirrer using homogenizer. Finally, the mixture was placed in the vacuum oven for 10 min to remove the air bubbles after that the mixture was poured into the [25] ) The free vibration analysis of the CNT reinforced composite shells were performed experimentally under clamped free (CF) support conditions. The schematic picture of the test setup is shown in Figure 3.…”

“…The CNT reinforced cylindrical composite shells were maintained in the uniform dimensions of 350 mm (length) Â 50 mm (0/90/0/90/0) configuration. The material properties of the CNT reinforced laminated composites are taken from Sushila et al [25] and the material properties are given in Table 1. The natural frequencies of the Glass fiber reinforced polymer composite (GFRP) composite and CNT reinforced composite shells under CF conditions are determined and the percentage deviation is presented in Table 2.…”