Dimensional Change of CFRP Taking Account of Moisture Concentration

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  • ARAO Yoshihiko
    Graduate School of Waseda University
  • KOYANAGI Jun
    Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science
  • HATTA Hiroshi
    Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science
  • KAWADA Hiroyuki
    Department of Mechanical Engineering, Waseda University

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Other Title
  • ＣＦＲＰの吸湿濃度を考慮した微視的寸法変化の調査
  • CFRP ノ キュウシツ ノウド オ コウリョシタ ビシテキ スンポウ ヘンカ ノ チョウサ

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Abstract

Moisture absorption behavior of CFRP and its effect on dimensional stability was examined. Moisture diffusivity in CFRP was determined by measuring specimen weight during the moisture absorption test. Three types of CFRP specimens, unidirectionally reinforced, quasi-isotropically laminated and cloth-laminated composites were prepared. Each CFRP was processed into two geometries; a thin plate for determination of diffusion constants and a rod with square cross-section for the discussion of two-dimensional diffusion behavior. Coefficient of moisture expansion (CME) was also obtained from specimen deformation involving moisture absorption. During moisture absorption, the specimen surfaces strongly deformed especially near the edges because of three-dimensional moisture concentration distribution. This deformation was reasonably predicted by the finite element analysis using diffusion constants and CME, which have been experimentally determined. For unidirectional CFRP, an effect of fiber location distribution on CME is discussed by a micromechanical FEA.

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