Evaluation of transverse crack initiation in cross-ply CFRP laminates under high-cycle fatigue loading

Keigo Takamura, Atsushi Hosoi, Narumichi Sato, Hiroyuki Kawada

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    This study focused on the initiation of a transverse crack in cross-ply CFRP laminates under fatigue loading. Transverse cracks induce more serious damages, such as delamination or fiber breakage. It is essential to understand the mechanism of the transverse crack onset under fatigue loading for improving long-term durability and reliability of CFRP laminates. Therefore, a method to evaluate and predict the initiation of a transverse crack in cross-ply CFRP laminates under fatigue loading was proposed. Fatigue tests at various stress levels were performed to evaluate the initiation and multiplication of the transverse cracks. Fatigue tests were interrupted at arbitrary loading cycles to observe damage in cross-ply CFRP laminates. The transverse cracks caused in the laminates were observed by an optical microscope and soft X-ray photography. The fatigue limit of transverse crack initiation in this fatigue conditions was indicated by calculating the stress applied in 90° layer of the laminates at the saturated state of the transverse cracks with a variational approach. Moreover, the analytical method on the basis of Paris law in order to predict the number of cycles to transverse crack initiation under fatigue loading was proposed. As the results, the predicted number of cycles to transverse crack initiation shows good agreement with experimental results.

    Original languageEnglish
    Title of host publication7th Asian-Australasian Conference on Composite Materials 2010, ACCM 2010
    PublisherACCM-7 Organizing Committee
    Pages273-276
    Number of pages4
    Volume1
    ISBN (Print)9781632660756
    Publication statusPublished - 2010
    Event7th Asian-Australasian Conference on Composite Materials 2010, ACCM 2010 - Taipei
    Duration: 2010 Nov 152010 Nov 18

    Other

    Other7th Asian-Australasian Conference on Composite Materials 2010, ACCM 2010
    CityTaipei
    Period10/11/1510/11/18

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    Keywords

    • CFRP
    • Fatigue
    • Initiation
    • Prediction
    • Transverse crack

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials

    Cite this

    Takamura, K., Hosoi, A., Sato, N., & Kawada, H. (2010). Evaluation of transverse crack initiation in cross-ply CFRP laminates under high-cycle fatigue loading. In 7th Asian-Australasian Conference on Composite Materials 2010, ACCM 2010 (Vol. 1, pp. 273-276). ACCM-7 Organizing Committee.