Advanced Composite Materials

The Korean Society for Composite Materials (한국복합재료학회)
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High-cycle fatigue characteristics of quasi-isotropic CFRP laminates

  • Hosoi, Atsushi (Graduate School of Science and Engineering, Waseda University) ;
  • Arao, Yoshihiko (Graduate School of Science and Engineering, Waseda University) ;
  • Karasawa, Hirokazu (Toshiba Corporation Industrial and Power Systems and Services Company) ;
  • Kawada, Hiroyuki (Department of Mechanical Engineering, Waseda University)
  • Published : 2007.06.01
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Abstract

High-cycle fatigue characteristics of quasi-isotropic carbon fiber reinforced plastic (CFRP) laminates [-45/0/45/90]s up to $10^8$ cycles were investigated. To assess the fatigue behavior in the high-cycle region, fatigue tests were conducted at a frequency of 100 Hz, since it is difficult to investigate the fatigue characteristics in high-cycle at 5 Hz. Then, the damage behavior of the specimen was observed with a microscope, soft X-ray photography and a 3D ultrasonic inspection system. In this study, to evaluate quantitative characteristics of both transverse crack propagation and delamination growth in the high-cycle region, the energy release rate associated with damage growth in the width direction was calculated. Transverse crack propagation and delamination growth in the width direction were evaluated based on a modified Paris law approach. The results revealed that transverse crack propagation delayed under the test conditions of less than ${\sigma}_{max}/{\sigma}_b$ = 0.3 of the applied stress level.

Keywords

References

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