Abstract
This research aims to perform a symmetric investigation regarding the multiwall carbon nanotube (MWCNT) effect on the damping properties of different composite configurations. Nanophased epoxy is ultrasonically prepared and used to fabricate MWCNT/E nanocomposite as well as to hybridize advanced composite laminates with different fiber configuration. The hybridized composite laminates include, quasi-isotropic [0/45/90]s glass fiber reinforced nanophased-epoxy (QI-GFR/MWCNT/E) and unidirectional [0]8 glass fiber reinforced nanophased-epoxy (UD-GFR/MWCNT/E). Free vibration tests are used for characterization the damping properties through the exponential decay response of the tested materials, while the frequency response function (FRF) is used for determination the storage and loss moduli. The storage moduli (flexural moduli) and loss moduli of the investigated materials were determined using free vibration tests as a nondestructive technique. The storage modulus of MWCNT/E nanocomposite was improved by 7.3% while the storage moduli of QI-GFR/MWCNT/E and UI-GFR/MWCNT/E are reduced by 9.1% and 5.2% respectively. The experimental investigations reveal that the addition of 1 wt% MWCNTs improves the damping ratio of the newly prepared materials in some cases to about 100%.
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