Amplitude dependent damping behaviour of fundamental mode for CFRP composite tubes: Effect of cross-section

Komal Chawla, Samit Ray-Chaudhuri

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

This study investigates the amplitude dependent damping behaviour of the fundamental mode for composite tubes under dynamic excitations. For this purpose, a closed form solution of damping ratio is derived for a cantilever tube subjected to harmonic base excitation while accounting for stress fields, material properties and cross-sectional configurations of the member. Shake table experiments are performed on square, hexagonal and circular woven carbon fibre-reinforced polymer (CFRP) tubes of length 1 m. To measure the responses along the tube length, accelerometers are used. In addition, table motions are also recorded. Based on these measurements, damping ratios are obtained from the experiments for varying levels of excitation. It is found from the experiments that the damping ratio increases with the increase in excitation amplitude. Among the tubes considered, damping ratio is noted to be higher for the square tube in comparison to the circular tube. This is due to the presence of more material near the edges (which is particularly beneficial as stresses are higher at the edges than the neutral axis) for the square tube in comparison to the circular tube. It is also found that the damping ratios obtained from the proposed expression are in well agreement with the experimentally measured values with a maximum deviation of about 10%.

Original languageEnglish
Article number115313
JournalJournal of Sound and Vibration
Volume476
DOIs
StatePublished - Jun 23 2020
Externally publishedYes

Funding

The authors would like to thank lab technicians and staff of structural engineering laboratory, Indian Institute of Technology, Kanpur for their help and guidance during the work. This work was partially supported by Indian Space Research Organization (ISRO) through ISRO-IITK Space Technology Cell and Ministry of Human Resource Development (MHRD). The authors would like to thank lab technicians and staff of structural engineering laboratory, Indian Institute of Technology, Kanpur for their help and guidance during the work. This work was partially supported by Indian Space Research Organization (ISRO) through ISRO-IITK Space Technology Cell and Ministry of Human Resource Development (MHRD).

Keywords

  • Base excitation
  • Cross-section
  • Damping ratio
  • Woven CFRP composite Tube

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