Effect of carbon nanotube reinforcement on the natural frequencies and damping ratios of nanocomposite beams

Hocaoglu M., KARAGÜLLE H.

MATERIALS RESEARCH EXPRESS, vol.7, no.2, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 7 Issue: 2
  • Publication Date: 2020
  • Doi Number: 10.1088/2053-1591/ab721a
  • Journal Name: MATERIALS RESEARCH EXPRESS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Communication Abstracts, Compendex, INSPEC, Metadex, Directory of Open Access Journals, Civil Engineering Abstracts
  • Keywords: nanocomposites, vibration, carbon nanotubes, BEHAVIOR
  • Dokuz Eylül University Affiliated: Yes

Abstract

In this study, the effect of carbon nanotube (CNT) reinforcement on the natural frequencies and damping ratios of nanocomposite beams are examined. Three nanocomposite plates reinforced with different CNT weight ratios (0% neat epoxy-glass fiber composite beam, 0.25%, 0.5%) are produced. Multi Walled Carbon Nanotubes (Purity>96%, outside diameter < 8nm) are mixed into the epoxy resin with an ultrasonic stirrer. The plates also contain glass fibres as an additional reinforcement. Test specimens are cut parallel and perpendicular to the direction of the fibres to obtain two different sets of specimens. Free vibration tests are performed by a wireless accelerometer sensor (WAS), a wireless data acquisition system (WDA) and a PC. Natural frequencies and damping ratios are determined from the acceleration data obtained from the experiments. For both the 0 degrees and 90 degrees specimens an increase in natural frequency is observed. However, while the damping ratio of the 0 degrees specimen increases, the damping ratio of 90 degrees one decreases.