Modal Analysis of Specific Composite Sandwich Structures

Al-Khazraji, Mustafa S.; Bakhy, Sadeq H.; Jweeg, Muhsin J.

doi:10.30684/etj.2022.133585.1195

	Modal Analysis of Specific Composite Sandwich Structures
Engineering and Technology Journal
Article 2, Volume 41, Issue 1, January 2023, Pages 13-22 PDF (1.43 M)
Document Type: Research Paper
DOI: 10.30684/etj.2022.133585.1195
Authors
Mustafa S. Al-Khazraji^* ¹; Sadeq H. Bakhy²; Muhsin J. Jweeg³
¹Mechanical Engineering Dept., College of Engineering., Al-Nahrain University - Iraq
²Department of Mechanical Engineering, University of Technology, Baghdad, Iraq
³Al-Farahidi University, Baghdad, Iraq
Abstract
Composite sandwich structures are gaining attention due to their inherent properties, such as lightweight, low density, and high strength. The forced vibration response of these structures was studied experimentally to investigate the effects of external loads on these structures. In this work, four composite sandwich structures were manufactured using carbon fiber, glass fibers, and foam and tested on a specially designed vibration test rig by hitting the specimen with an impact hammer. The response was recorded by an accelerometer attached to the specimens. The accelerometer signal was amplified, and the input and output signals were transferred to LABVIEW via a data acquisition card and were processed in MATLAB. The impact hammer acts as an external excitation source, and the frequency response function was found for each specimen under various edge boundary conditions. Bode plots were plotted for each test, and the peak frequency and the phase difference were compared. It was found that composite sandwich specimens made of carbon fiber skins and carbon fiber honeycomb core showed a higher frequency response among all specimens (400 Hz). Furthermore, it was found that the foam core layer reduces the phase difference between the input and output signals from (360degrees) to (180degrees) compared with other honeycomb cores. Therefore, the procedure outlined in this research can be applied to other structures to investigate their vibration response. In addition, this work could be beneficial for the diagnosis of structure stability using a forced vibration response procedure.
Highlights
Honeycomb composite core was manufactured using the corrugated method. A new vibration test rig design was proposed. Forced vibration tests were performed on the manufactured specimens. All-carbon fiber showed the highest frequency response among all specimens. Honeycomb cores have higher damping compared with foam cores.
Keywords
Composite sandwich; sandwich manufacturing; forced vibration; modal analysis; frequency response function

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