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
ISBN (Print)9781632660756
Publication statusPublished - 2010 Jan 1
Event7th Asian-Australasian Conference on Composite Materials 2010, ACCM 2010 - Taipei, Taiwan, Province of China
Duration: 2010 Nov 152010 Nov 18

Publication series

Name7th Asian-Australasian Conference on Composite Materials 2010, ACCM 2010
Volume1

Conference

Conference7th Asian-Australasian Conference on Composite Materials 2010, ACCM 2010
CountryTaiwan, Province of China
CityTaipei
Period10/11/1510/11/18

Keywords

  • CFRP
  • Fatigue
  • Initiation
  • Prediction
  • Transverse crack

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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  • 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 (pp. 273-276). (7th Asian-Australasian Conference on Composite Materials 2010, ACCM 2010; Vol. 1). ACCM-7 Organizing Committee.