Time-dependent out-of-plane deformation of UD-CFRP in humid environment

Yoshihiko Arao*, Jun Koyanagi, Shin Utsunomiya, Hiroyuki Kawada

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


Time-dependent out-of-plane deformation of UD-CFRP (unidirectional CFRP laminate) caused by subjection to a humid environment was examined and analyzed. The UD-CFRP plate showed unpredictable geometrical variation with time in a humid environment, like asymmetric materials. The unpredictability was caused by non-uniform fiber distribution in the thickness direction of the specimen. A three-dimensional diffusion-stress coupling analysis considering the non-uniform fiber distribution was conducted based on finite element analysis. The analytical results showed very good agreement with the experimental results. Furthermore, the relationship between the non-uniform fiber distribution and the out-of-plane deformation with time was obtained quantitatively.

Original languageEnglish
Pages (from-to)1720-1725
Number of pages6
JournalComposites Science and Technology
Issue number11-12
Publication statusPublished - 2009 Sept


  • A. Polymer-matrix composites (PMCs)
  • B. Hygrothermal effect
  • C. Deformation
  • C. Finite element analysis (FEA)
  • C. Laminate

ASJC Scopus subject areas

  • Ceramics and Composites
  • General Engineering


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