板厚方向の縫合によるCFRP積層板の面外衝撃損傷抑制効果

概要

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The present study investigated the improvement of low-velocity impact damage resistance of CFRP laminates due to the through-the-thickness stitching experimentally and numerically. 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. Then we performed FEM analysis and calculated the energy release rate of the delamination by using Virtual Crack Closure Technique (VCCT). The numerical results revealed that the stitching affected the through-the-thickness damage distribution because the stitch threads particularly decreased the mode I energy release rate around the bottom of the laminate. Comparison of the results of models which contain delamination of various size revealed that the energy release rate became smaller as delamination size increased, therefore the stitching improved the impact resistance more effectively when the impact energy was larger.
2008-09-15