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Effect of moisture absorption on damping and dynamic stiffness of carbon fiber/epoxy composites

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Abstract

In this paper, the damping and dynamic stiffness of UHN125C carbon fiber/epoxy composite beam was experimentally measured. The effect of fiber orientation angle and stacking sequences on damping, resonance frequency, and dynamic stiffness was discussed with a focus on the effect of moisture absorption. Dried specimens were immersed in distilled water for a certain period to absorb water for 8, 16, and 24 d, respectively, and the moisture content absorbed in the specimen was measured. Furthermore, using the impact hammer technique, the measurements of dynamic responses were conducted on a cantilever beam specimen with one end clamped by bolts and metal plates. The damping properties in terms of loss factor were approximated by half-power bandwidth technique. The dynamic stiffness was evaluated using resonance frequency as a function of moisture content. The damping increased with the increase of moisture content; however, the dynamic stiffness reduced with the reduction of resonance frequency. The results of the dynamic stiffness were aided by measuring the dynamic strain using DBU-120A strain-indicating software. The increment in the dynamic strain strengthened the results obtained for dynamic stiffness.

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Authors and Affiliations

  1. Department of Mechanical Engineering Myongji University, Yongin, South Korea

    Behzad Ahmed Zai, M. K. Park, Hassan Mehboob & Rashid Ali

  2. Korean Institute of Aerospace Technology, Korean Air, Taejon, 305-309, South Korea

    H. S. Choi

Authors
  1. Behzad Ahmed Zai
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  2. M. K. Park
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  3. H. S. Choi
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  4. Hassan Mehboob
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  5. Rashid Ali
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Corresponding author

Correspondence to M. K. Park.

Additional information

This paper was recommended for publication in revised form by Associate Editor Seockhyun Kim

Behzad Ahmed Zai received his MS in Mechanical Engineering from Myongji University, South Korea in 2008. He works as an assistant manager in the Pakistan Space and Upper Atmosphere Research Commission. His area of research is structural analysis and mechanical vibration.

M. K. Park received his Ph.D. from the University of Florida in the U.S. in 1989. He is a professor in the Department of Mechanical Engineering, Myongji University, South Korea. His research interests include solid and fracture mechanics.

H. S. Choi received his Ph.D. from Northwestern University in the U.S. He works in the Composite R&D, Project Planning CKorean Air R&D Center Aerospace Division in Taejon, South Korea. His area of research is composite structural analysis.

Hassan Mehboob received his MS in Mechanical Engineering from Myongji University, South Korea in 2009. His area of research is solid mechanics and finite element analysis.

Rashid Ali obtained his MS degree from Myongji University, South Korea. He is currently working as a Research Associate in the Faculty of Materials Science Engineering in GIK Institute of Engineering and Technology.

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Zai, B.A., Park, M.K., Choi, H.S. et al. Effect of moisture absorption on damping and dynamic stiffness of carbon fiber/epoxy composites. J Mech Sci Technol 23, 2998–3004 (2009). https://doi.org/10.1007/s12206-009-0908-0

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  • DOI: https://doi.org/10.1007/s12206-009-0908-0

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