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Damage tolerance of stitched stiffened composite panels with clearly visible impact damage to a stiffener was investigated. Two-blade stiffened composites panels were fabricated using resin film infiltration technique. The effects of stitching are assessed using unstitched, selectively stitched and fully stitched panels. Impact damage was induced using a drop weight impact of 30 J from the skin side...
Through-thickness stitching followed by resin film infusion (RFI) process is one of the most promising and cost-effective methods of manufacturing stiffened composite panels with higher delamination resistance. The specific benefits of stitching are reduced manufacturing cost with rapid stacking of built-up stitched plies, increased reliability of using stacked plies with predetermined orientations...
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