Improvement in dynamic properties of laminated MWCNT-polystyrene composite beams via an integrated numerical–experimental approach

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DOIResolve DOI: http://doi.org/10.1016/j.compstruct.2012.03.028
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TypeArticle
Journal titleComposite Structures
ISSN0263-8223
Volume94
Issue8
Pages25382547
SubjectStructural composites; Carbon nanotubes; Vibration behavior; Testing and modeling
AbstractA new concept for the optimization of dynamic behavior of laminated nanocomposites is introduced where fiber orientation factor in continuous fiber-reinforced composites is replaced by different wt.% of carbon nanotubes (CNTs) in each layer. First, at a design concept level, an optimum distribution of multi-walled CNTs (MWCNTs) through the thickness of a typical cantilever beam is sought to achieve its highest fundamental natural frequency for a given weight percent of MWCNTs. This is done using a finite element (FE) model in ABAQUS along with a user-defined Python code. Next, based on the obtained optimum distribution, actual laminated MWCNT/polystyrene (PS) composite beams were fabricated and their effective stiffness, fundamental natural frequencies and damping ratios were measured through static deflection and free vibration tests. It was found that the optimum distribution of MWCNTs resulted in an increase of 21.9% and 10.4% in the effective Young’s modulus and the fundamental damped natural frequency values, respectively, which were almost two-fold higher than those of a beam with a uniform MWCNT distribution. In addition, compared to a pure polymer beam, 38.9% and 27.8% improvements in the damping ratio of the uniformly and optimally distributed MWCNT polymer composite beams were achieved.
Publication date
LanguageEnglish
AffiliationAutomotive; National Research Council Canada
Peer reviewedYes
IdentifierS0263822312001432
NPARC number21268718
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Record identifierc313b598-4601-4bc3-a4ef-0220931e2825
Record created2013-11-08
Record modified2016-05-09
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