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首页> 美国政府科技报告 >Effects of Through-the-Thickness Stitching on Impact and Interlaminar FractureProperties of Textile Graphite/Epoxy Laminates
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Effects of Through-the-Thickness Stitching on Impact and Interlaminar FractureProperties of Textile Graphite/Epoxy Laminates

机译：贯穿厚度缝合对纺织石墨/环氧层压板冲击和层间断裂性能的影响

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摘要

This study investigated the effects of through-the-thickness stitching on impactdamage resistance, impact damage tolerance, and mode I and mode II fracture toughness of textile graphite/epoxy laminates. Uniweave resin-transfer-molded 48 ply graphite/epoxy (AS4/3501-6) laminates were stitched with Kevlar and glass yarns of different linear densities and stitch spacings. Delaminations were implanted during processing to simulate impact damage. Sublaminate buckling tests were performed to determine the effects of stitching on the compressive strength. The results showed outstanding improvements of up to 400 percent in the compression strength over the unstitched laminates. In impact and static indentation tests the onset of damage occurred at the same level, but the extent of damage was less in stitched laminates. Mode I fracture toughness of 24 ply Uniweave unidirectional (AS4/3501-6) stitched laminates was measured by conducting double-cantilever-beam tests. The critical strain energy release rate (G(sub Ic)) was found to be up to 30 times higher than the unstitched laminates. Mode II fracture toughness of the Uniweave laminates was measured by performing end-notched-flexure tests. Two new methods to compute the apparent G(sub IIc) are presented. The apparent G(sub IIc) was found to be at least 5-15 times higher for the stitched laminates.

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