On the mechanisms of modal damping in FRP/honeycomb sandwich panels

Abstract

Sandwich panels made of fibre-reinforced plastic (FRP) skins and a honeycomb core can be effectively damped through the choice of the skin and especially of the core materials. Because the core is often highly damped, a lateral deflection that causes more shearing of the core than bending of the skin increases sandwich damping. Aside from the skin and the core material properties, the shearing/bending ratio depends on a number of other, often interacting, factors, including the sandwich planar as well as transverse dimensions, the particular modal pattern in which the panel vibrates and its relationship to the type of skin layup, as well as the panel end conditions. In the present work, using a simple, first-order shear deformation theory, damping results have been produced for simple modes of vibration of a sandwich panel comprising composite skins and a damped honeycomb core, demonstrating the mechanisms by which the above factors affect the FRP skin/honeycomb core sandwich damping.

A homogenization method for natural frequencies and damping analysis of composite pyramidal lattice truss sandwich structures based on representative volume elements

“…[3][4][5][6] However, its computational cost is huge. Plate and shell theory is an efficient choice in practice, 13 including equivalent single-layer (ESL) theory 14,15 and the layerwise model. [16][17][18][19][20] Although the ESL theory is highly efficient, it cannot accurately present the zig-zag displacement of the sections.…”

Effect of Coating on the Specific Properties and Damping Loss Factor of Ultem 1010

“…Many researchers have reported studies of the theoretical and empirical investigation of damping properties and natural frequencies of materials. They presented the effect of different parameters such as Poisson's ratio and modulus of elasticity on the natural frequencies and damping loss factor (Vitaliy et al, Vergassola et al, 2018, Al-Jumaily and Jameel, 106 ZANCO Journal of Pure and Applied Sciences 2021 2000, Xu and Deng, 2016, Chirikov et al, 2020, Abbasloo and Maheri, 2018, Mohammed, 2017. (Ge et al, 2020), studied the damping properties of a 3D printed photopolymer.…”