Advanced Composite Materials

The Korean Society for Composite Materials (한국복합재료학회)
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Experimental investigation of interlaminar mechanical properties on carbon fiber stitched CFRP laminates

  • Iwahori, Yutaka (Composite Technology Center, Japan Aerospace Exploration Agency) ;
  • Ishikawa, Takashi (Aviation Program Group, Japan Aerospace Exploration Agency) ;
  • Watanabe, Naoyuki (Department of Aerospace Engineering, Faculty of System Design, Tokyo Metropolitan University) ;
  • Ito, Akira (School of Science and Technology, Meiji University) ;
  • Hayashi, Yoichi (Composite Technology Center, Japan Aerospace Exploration Agency) ;
  • Sugimoto, Sunao (Composite Technology Center, Japan Aerospace Exploration Agency)
  • Published : 2007.06.01
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Abstract

Experimental investigations of interlaminar mechanical properties for carbon fiber reinforced plastic (CFRP) laminates were carried out using aramid fiber ($Kevlar^{(R)}$-29 1000d) and carbon fiber (TR40-1K 612d, Mitsubishi Rayon) stitching. Various carbon fiber (CF) stitch densities were used to prepare a number of CF stitched CFRP laminates for double cantilever beam (DCB) tests. An insert tongue-type loading fixture, developed by the Japan Aerospace Exploration Agency (formerly the National Aerospace Laboratory of Japan), was also employed in the DCB test. Interlaminar tension tests were carried out under an out-of-plane directional loading using a single CF stitch thread in the CFRP laminates. The DCB test results clarified that the relationship between the volume fractions of the CF stitch thread ($V_{ft}$) and mode I critical energy release rate ($G_{Ic}$) showed a mostly linear function with a higher gradient than that of the $Kevlar^{(R)}$ stitched CFRP laminates. The CF stitched CFRP tension test results indicated that the consumption energy per unit area ($E_i$) was larger than that of $Kevlar^{(R)}$ stitched CFRP laminates.

Keywords

References

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