Free vibration characteristics of multi-core sandwich composite beams: Experimental and numerical investigation

Abstract

This study investigates the free vibration responses of laminated composite sandwich beam with multi-cores using experimental and numerical methods. The laminated composite face sheets are made by using hand layup method. An experimental modal test has been carried for different configurations of multi-core sandwich beams under different end conditions. The single-core and multi-core sandwich beams has been modeled and the natural frequencies of sandwich beams are determined using ANSYS software. The numerical model is verified by comparing the obtained natural frequencies with experimental results. The numerical and experimental results indicate that the multi-core sandwich beam greatly influences the structural stiffness compared with single-core sandwich beam under different end conditions. Furthermore, the influence of several parameters such as the end conditions, thickness of the core layer, and stacking sequence on the natural frequencies of the various configurations of the multi-core sandwich beams are presented.

Free and forced vibration response of a laminated composite sandwich beam with dual honeycomb core: Numerical and experimental study

“…It is also clear that the DC beam's damping ratio in all five modes is superior to that of the SC sandwich beam in both cantilever and fixed beam end conditions. The same pattern was also seen in References 24,28, the DC sandwich beam's natural frequencies rise with an increment in the sandwich beam strain energy. This increase in strain rate has a positive effect on the stiffness and dynamic properties of the DC sandwich beam as well.…”

“…The out-of-plane shear modulus of the honeycomb core was calculated using an alternative dynamic approach and The frequencies in the XZ and YZ axes are used to calculate the honeycomb core's out-of-plane shear modulus and substituted in the mathematical expressions (28) and ( 29) developed by Schwingshackl et al 40 and the results are listed in Table 2.…”

“…It has been noted that the natural frequencies rise when the intermediate layer thickness increases. According to the work of Selvaraj, Gupta, et al, 28 multi‐core sandwich beams' vibrational behavior was analyzed both numerically and experimentally. Sandwich plates consisting of multiple cores and face sheets of natural fibers have been studied in terms of their mechanical and dynamic characteristics by Selvaraj, Maneengam, et al, 29 The natural frequencies of the multiple‐core sandwich plate were found to be higher than those of the single‐core (SC) sandwich plate.…”

Vibrational behavior of a 3D printed biomimetic dual‐core composite sandwich beam: An experimental and numerical study

“…It was concluded that the two cores provide the best damping performance due to higher shear modulus. According to Selvaraj et al, 32 multicore sandwich beams vibrational behavior was analyzed numerically and experimentally. Shankar et al 33 used multimagnetorheological elastomer (MRE) cores to examine the dynamic responses of composite sandwich cylindrical shells with carbon nanotubes (CNT) reinforcement.…”

Influences of magnetic environment and two moving loads on lateral and axial displacement of sandwich graphene-reinforced copper-based composite beams with soft porous core

“…They obtained the natural frequency for multi-core sandwich beams and single-core sandwich beams. Numerical and experimental results show that multi-core sandwich beams, in comparison with single-core sandwich beams in different boundary conditions, strongly affect the rigidity of the structure (Selvaraj et al, 2021). Songsuwan et al examined the free and forced vibrations of a sandwich beam under multiple moving forces.…”