Analysis of time-dependent deformation of a CFRP mirror under hot and humid conditions

Yoshihiko Arao, Jun Koyanagi, Shin Utsunomiya, Shin Ichi Takeda, Hiroyuki Kawada

    Research output: Contribution to journalArticle

    13 Citations (Scopus)

    Abstract

    The long-term micro-dimensional stability of a carbon fiber reinforced plastic (CFRP) mirror was investigated in terms of creep deformation, moisture swelling and self-shrinkage. A 4-point bending creep test was carried out using specimens made from pitch-based high-modulus CFRP laminates to obtain a creep constant based on linear viscoelasticity, and we then investigated the weight change and geometrical change during a moisture absorption test using a CFRP specimen. The anisotropic diffusivities and coefficients of moisture expansion (CMEs) in CFRP laminates were obtained by fitting analytical data into the experimental data. Finally, the shrinkage behavior caused by physical aging of the polymeric material was examined using a fiber Bragg grating (FBG) sensor embedded in the neat resin specimen. Applying these results, we analyzed the geometrical changes in a CFRP mirror that resulted from time-dependent deformation by the mirror's weight, moisture absorption and physical aging, respectively. We discuss which factor is dominant in the deformation of CFRP mirrors under various conditions.

    Original languageEnglish
    Pages (from-to)183-197
    Number of pages15
    JournalMechanics of Time-Dependent Materials
    Volume13
    Issue number2
    DOIs
    Publication statusPublished - 2009 May

    Fingerprint

    Carbon fiber reinforced plastics
    Mirrors
    Moisture
    Plastic laminates
    Creep
    Aging of materials
    Dimensional stability
    Viscoelasticity
    Fiber Bragg gratings
    Swelling
    carbon fiber reinforced plastic
    Resins
    Sensors
    Polymers

    Keywords

    • CFRP mirror
    • Creep
    • Dimensional stability
    • Moisture absorption
    • Physical aging

    ASJC Scopus subject areas

    • Materials Science(all)
    • Chemical Engineering(all)
    • Mechanical Engineering
    • Aerospace Engineering

    Cite this

    Analysis of time-dependent deformation of a CFRP mirror under hot and humid conditions. / Arao, Yoshihiko; Koyanagi, Jun; Utsunomiya, Shin; Takeda, Shin Ichi; Kawada, Hiroyuki.

    In: Mechanics of Time-Dependent Materials, Vol. 13, No. 2, 05.2009, p. 183-197.

    Research output: Contribution to journalArticle

    Arao, Yoshihiko ; Koyanagi, Jun ; Utsunomiya, Shin ; Takeda, Shin Ichi ; Kawada, Hiroyuki. / Analysis of time-dependent deformation of a CFRP mirror under hot and humid conditions. In: Mechanics of Time-Dependent Materials. 2009 ; Vol. 13, No. 2. pp. 183-197.
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