Advanced Composite Materials

The Korean Society for Composite Materials (한국복합재료학회)
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Improvement of Out-of-Plane Impact Damage Resistance of CFRP Due to Through-the-Thickness Stitching

  • Yoshimura, Akinori (Advanced Materials Group, Aerospace Research and Development Directorate (ARD), Japan Aerospace Exploration Agency (JAXA)) ;
  • Nakao, Tomoaki (Graduate school of Frontier Sciences, The University of Tokyo) ;
  • Takeda, Nobuo (Graduate school of Frontier Sciences, The University of Tokyo)
  • Received : 2008.03.12
  • Accepted : 2008.04.18
  • Published : 2009.06.01
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Abstract

The present study investigated, both experimentally and numerically, the improvement of low-velocity impact damage resistance of carbon fiber reinforced plastic (CFRP) laminates due to through-the-thickness stitching. First, we conducted drop-weight impact tests for stitched and unstitched laminates. The results of damage inspection confirmed that stitching did improve the impact damage resistance, and revealed that the improvement effect became greater as the impact energy increased. Moreover, the stitching affected the through-the-thickness damage distribution. Next, we performed FEM analysis and calculated the energy release rate of the delamination crack using the virtual crack closure technique (VCCT). The numerical results revealed that the stitching affected the through-the-thickness damage distribution because the stitch threads had a marked effect on decreasing both the modes I and II energy release rate around the bottom of the laminate. Comparison of the results for models that contained delaminations of various sizes revealed that the energy release rate became lower as delamination size increased; therefore the stitching improved the impact resistance more effectively when the impact energy was higher.

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