MIT: Nanotube-Stitched Carbon is Stronger With high strength and low weight, carbon-fiber composites have substantially improved the performance of aircraft. But the materials are laminates and have a weakness—the resin that bonds the layers together is vulnerable to impact damage. This vulnerability to undetected delamination prevents designers from using carbon fiber’s full strength potential. Through-laminate reinforcement by Z-pinning or stitching increases delamination ...

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